[PATCH 0000/0020] Staging: hv: Driver cleanup

[PATCH 0000/0020] Staging: hv: Driver cleanup

[K. Y. Srinivasan]

Address Greg's VmBus audit comments:

	1) Leverage driver_data field in struct hv_vmbus_device_id to
	   simplify driver code.

	2) Make the util driver conform to the Linux Driver Model.

	3) Get rid of the ext field in struct hv_device by using the
	   driver specific data functionality.

	4) Implement vmbus specific wrapper functions for setting and getting
	   driver specific data..

	5) Other general cleanup.


Regards,

K. Y

[PATCH 01/20] Staging: hv: vmbus: Introduce a utility function to match hv_vmbus_device_id

[K. Y. Srinivasan]

Introduce a utility function to match hv_vmbus_device_id.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/vmbus_drv.c |   23 ++++++++++++++++++-----
 1 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c
index 375e451..77f4373 100644
--- a/drivers/staging/hv/vmbus_drv.c
+++ b/drivers/staging/hv/vmbus_drv.c
@@ -272,6 +272,22 @@ static inline bool is_null_guid(const __u8 *guid)
 	return true;
 }
 
+/*
+ * Return a matching hv_vmbus_device_id pointer.
+ * If there is no match, return NULL.
+ */
+static const struct hv_vmbus_device_id *hv_vmbus_get_id(
+					const struct hv_vmbus_device_id *id,
+					__u8 *guid)
+{
+	for (; !is_null_guid(id->guid); id++)
+		if (!memcmp(&id->guid, guid, sizeof(uuid_le)))
+			return id;
+
+	return NULL;
+}
+
+
 
 /*
  * vmbus_match - Attempt to match the specified device to the specified driver
@@ -280,12 +296,9 @@ static int vmbus_match(struct device *device, struct device_driver *driver)
 {
 	struct hv_driver *drv = drv_to_hv_drv(driver);
 	struct hv_device *hv_dev = device_to_hv_device(device);
-	const struct hv_vmbus_device_id *id_array = drv->id_table;
 
-	for (; !is_null_guid(id_array->guid); id_array++)
-		if (!memcmp(&id_array->guid, &hv_dev->dev_type.b,
-				sizeof(uuid_le)))
-			return 1;
+	if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b))
+		return 1;
 
 	return 0;
 }
-- 
1.7.4.1

[PATCH 02/20] Staging: hv: vmbus: Change the signature of struct hv_driver probe function

[K. Y. Srinivasan]

In preparation to leveraging the driver_data field in struct
hv_vmbus_device_id, change the signature of struct hv_driver probe function.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/hv_mouse.c    |    3 ++-
 drivers/staging/hv/hv_util.c     |    3 ++-
 drivers/staging/hv/hyperv.h      |    2 +-
 drivers/staging/hv/netvsc_drv.c  |    3 ++-
 drivers/staging/hv/storvsc_drv.c |    3 ++-
 drivers/staging/hv/vmbus_drv.c   |    4 +++-
 6 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/hv/hv_mouse.c b/drivers/staging/hv/hv_mouse.c
index dbb04ee..5ff8a03 100644
--- a/drivers/staging/hv/hv_mouse.c
+++ b/drivers/staging/hv/hv_mouse.c
@@ -823,7 +823,8 @@ static int mousevsc_on_device_remove(struct hv_device *device)
 }
 
 
-static int mousevsc_probe(struct hv_device *dev)
+static int mousevsc_probe(struct hv_device *dev,
+			const struct hv_vmbus_device_id *dev_id)
 {
 	int ret = 0;
 
diff --git a/drivers/staging/hv/hv_util.c b/drivers/staging/hv/hv_util.c
index 6039217..d9460fdd 100644
--- a/drivers/staging/hv/hv_util.c
+++ b/drivers/staging/hv/hv_util.c
@@ -239,7 +239,8 @@ static void heartbeat_onchannelcallback(void *context)
  * The devices managed by the util driver don't need any additional
  * setup.
  */
-static int util_probe(struct hv_device *dev)
+static int util_probe(struct hv_device *dev,
+			const struct hv_vmbus_device_id *dev_id)
 {
 	return 0;
 }
diff --git a/drivers/staging/hv/hyperv.h b/drivers/staging/hv/hyperv.h
index c249811..caa3a7b 100644
--- a/drivers/staging/hv/hyperv.h
+++ b/drivers/staging/hv/hyperv.h
@@ -810,7 +810,7 @@ struct hv_driver {
 
 	struct device_driver driver;
 
-	int (*probe)(struct hv_device *);
+	int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *);
 	int (*remove)(struct hv_device *);
 	void (*shutdown)(struct hv_device *);
 
diff --git a/drivers/staging/hv/netvsc_drv.c b/drivers/staging/hv/netvsc_drv.c
index 30b9c80..d06cde2 100644
--- a/drivers/staging/hv/netvsc_drv.c
+++ b/drivers/staging/hv/netvsc_drv.c
@@ -329,7 +329,8 @@ static void netvsc_send_garp(struct work_struct *w)
 }
 
 
-static int netvsc_probe(struct hv_device *dev)
+static int netvsc_probe(struct hv_device *dev,
+			const struct hv_vmbus_device_id *dev_id)
 {
 	struct net_device *net = NULL;
 	struct net_device_context *net_device_ctx;
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index b0c4e56..fff1e5b 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -1380,7 +1380,8 @@ MODULE_DEVICE_TABLE(vmbus, id_table);
  * storvsc_probe - Add a new device for this driver
  */
 
-static int storvsc_probe(struct hv_device *device)
+static int storvsc_probe(struct hv_device *device,
+			const struct hv_vmbus_device_id *dev_id)
 {
 	int ret;
 	struct Scsi_Host *host;
diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c
index 77f4373..2fccb1f 100644
--- a/drivers/staging/hv/vmbus_drv.c
+++ b/drivers/staging/hv/vmbus_drv.c
@@ -312,9 +312,11 @@ static int vmbus_probe(struct device *child_device)
 	struct hv_driver *drv =
 			drv_to_hv_drv(child_device->driver);
 	struct hv_device *dev = device_to_hv_device(child_device);
+	const struct hv_vmbus_device_id *dev_id;
 
+	dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b);
 	if (drv->probe) {
-		ret = drv->probe(dev);
+		ret = drv->probe(dev, dev_id);
 		if (ret != 0)
 			pr_err("probe failed for device %s (%d)\n",
 			       dev_name(child_device), ret);
-- 
1.7.4.1

[PATCH 03/20] Staging: hv: storvsc: Use the driver_data to identify ide

[K. Y. Srinivasan]

Use the driver_data to identify ide devices in storvsc_probe().

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/storvsc_drv.c |   22 ++++++++++------------
 1 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index fff1e5b..b996293 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -1359,17 +1359,20 @@ static struct scsi_host_template scsi_driver = {
 	.dma_boundary =		PAGE_SIZE-1,
 };
 
-/*
- * The storvsc_probe function assumes that the IDE guid
- * is the second entry.
- */
+enum {
+	SCSI_GUID,
+	IDE_GUID,
+};
+
 static const struct hv_vmbus_device_id id_table[] = {
 	/* SCSI guid */
 	{ VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
-		       0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) },
+		       0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
+	  .driver_data = SCSI_GUID },
 	/* IDE guid */
 	{ VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
-		       0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) },
+		       0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
+	  .driver_data = IDE_GUID },
 	{ },
 };
 
@@ -1387,15 +1390,10 @@ static int storvsc_probe(struct hv_device *device,
 	struct Scsi_Host *host;
 	struct hv_host_device *host_dev;
 	struct storvsc_device_info device_info;
-	bool dev_is_ide;
+	bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
 	int path = 0;
 	int target = 0;
 
-	if (!memcmp(&device->dev_type.b, id_table[1].guid, sizeof(uuid_le)))
-		dev_is_ide = true;
-	else
-		dev_is_ide = false;
-
 	host = scsi_host_alloc(&scsi_driver,
 			       sizeof(struct hv_host_device));
 	if (!host)
-- 
1.7.4.1

[PATCH 04/20] Staging: hv: vmbus: Introduce functions for setting and getting driver data

[K. Y. Srinivasan]

Introduce vmbus specific wrapper functions to set/get driver specific data.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/hyperv.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/hv/hyperv.h b/drivers/staging/hv/hyperv.h
index caa3a7b..91e557b 100644
--- a/drivers/staging/hv/hyperv.h
+++ b/drivers/staging/hv/hyperv.h
@@ -843,6 +843,15 @@ static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d)
 	return container_of(d, struct hv_driver, driver);
 }
 
+static inline void hv_set_drvdata(struct hv_device *dev, void *data)
+{
+	dev_set_drvdata(&dev->device, data);
+}
+
+static inline void *hv_get_drvdata(struct hv_device *dev)
+{
+	return dev_get_drvdata(&dev->device);
+}
 
 /* Vmbus interface */
 #define vmbus_driver_register(driver)	\
-- 
1.7.4.1

[PATCH 05/20] Staging: hv: util: Perform some service specific init/deinit in probe/remove

[K. Y. Srinivasan]

In preparation for modifying the util driver to fully conform to the
Linux Driver Model, perform some service specific init and de-init 
operations in util_probe()/util_remove()  as opposed to in 
init_hyperv_utils()/exit_hyperv_utils() as is currently done.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/hv_kvp.c  |    7 +--
 drivers/staging/hv/hv_kvp.h  |    2 +-
 drivers/staging/hv/hv_util.c |   95 ++++++++++++++++++++++++++----------------
 drivers/staging/hv/hyperv.h  |   14 ++++++
 4 files changed, 76 insertions(+), 42 deletions(-)

diff --git a/drivers/staging/hv/hv_kvp.c b/drivers/staging/hv/hv_kvp.c
index 13b0ecf..ff0d9ab 100644
--- a/drivers/staging/hv/hv_kvp.c
+++ b/drivers/staging/hv/hv_kvp.c
@@ -312,16 +312,14 @@ callback_done:
 }
 
 int
-hv_kvp_init(void)
+hv_kvp_init(struct hv_util_service *srv)
 {
 	int err;
 
 	err = cn_add_callback(&kvp_id, kvp_name, kvp_cn_callback);
 	if (err)
 		return err;
-	recv_buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
-	if (!recv_buffer)
-		return -ENOMEM;
+	recv_buffer = srv->recv_buffer;
 
 	return 0;
 }
@@ -330,5 +328,4 @@ void hv_kvp_deinit(void)
 {
 	cn_del_callback(&kvp_id);
 	cancel_delayed_work_sync(&kvp_work);
-	kfree(recv_buffer);
 }
diff --git a/drivers/staging/hv/hv_kvp.h b/drivers/staging/hv/hv_kvp.h
index 8c402f3..9b765d7 100644
--- a/drivers/staging/hv/hv_kvp.h
+++ b/drivers/staging/hv/hv_kvp.h
@@ -175,7 +175,7 @@ struct hv_kvp_msg {
 	struct hv_kvp_msg_enumerate	kvp_data;
 };
 
-int hv_kvp_init(void);
+int hv_kvp_init(struct hv_util_service *);
 void hv_kvp_deinit(void);
 void hv_kvp_onchannelcallback(void *);
 
diff --git a/drivers/staging/hv/hv_util.c b/drivers/staging/hv/hv_util.c
index d9460fdd..f082e5a 100644
--- a/drivers/staging/hv/hv_util.c
+++ b/drivers/staging/hv/hv_util.c
@@ -30,9 +30,31 @@
 #include "hyperv.h"
 #include "hv_kvp.h"
 
-static u8 *shut_txf_buf;
-static u8 *time_txf_buf;
-static u8 *hbeat_txf_buf;
+
+static void shutdown_onchannelcallback(void *context);
+static struct hv_util_service util_shutdown = {
+	.service_name = "Shutdown channel functionality initialized\n",
+	.util_cb = shutdown_onchannelcallback,
+};
+
+static void timesync_onchannelcallback(void *context);
+static struct hv_util_service util_timesynch = {
+	.service_name = "Timesync channel functionality initialized\n",
+	.util_cb = timesync_onchannelcallback,
+};
+
+static void heartbeat_onchannelcallback(void *context);
+static struct hv_util_service util_heartbeat = {
+	.service_name = "Heartbeat channel functionality initialized\n",
+	.util_cb = heartbeat_onchannelcallback,
+};
+
+static struct hv_util_service util_kvp = {
+	.service_name = "KVP channel functionality initialized\n",
+	.util_cb = hv_kvp_onchannelcallback,
+	.util_init = hv_kvp_init,
+	.util_deinit = hv_kvp_deinit,
+};
 
 static void shutdown_onchannelcallback(void *context)
 {
@@ -40,6 +62,7 @@ static void shutdown_onchannelcallback(void *context)
 	u32 recvlen;
 	u64 requestid;
 	u8  execute_shutdown = false;
+	u8  *shut_txf_buf = util_shutdown.recv_buffer;
 
 	struct shutdown_msg_data *shutdown_msg;
 
@@ -169,6 +192,7 @@ static void timesync_onchannelcallback(void *context)
 	u64 requestid;
 	struct icmsg_hdr *icmsghdrp;
 	struct ictimesync_data *timedatap;
+	u8 *time_txf_buf = util_timesynch.recv_buffer;
 
 	vmbus_recvpacket(channel, time_txf_buf,
 			 PAGE_SIZE, &recvlen, &requestid);
@@ -207,6 +231,7 @@ static void heartbeat_onchannelcallback(void *context)
 	u64 requestid;
 	struct icmsg_hdr *icmsghdrp;
 	struct heartbeat_msg_data *heartbeat_msg;
+	u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
 
 	vmbus_recvpacket(channel, hbeat_txf_buf,
 			 PAGE_SIZE, &recvlen, &requestid);
@@ -235,34 +260,56 @@ static void heartbeat_onchannelcallback(void *context)
 	}
 }
 
-/*
- * The devices managed by the util driver don't need any additional
- * setup.
- */
 static int util_probe(struct hv_device *dev,
 			const struct hv_vmbus_device_id *dev_id)
 {
+	struct hv_util_service *srv =
+		(struct hv_util_service *)dev_id->driver_data;
+	int ret;
+
+	srv->recv_buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!srv->recv_buffer)
+		return -ENOMEM;
+	if (srv->util_init) {
+		ret = srv->util_init(srv);
+		if (ret) {
+			kfree(srv->recv_buffer);
+			return -ENODEV;
+		}
+	}
+
+	hv_set_drvdata(dev, srv);
 	return 0;
 }
 
 static int util_remove(struct hv_device *dev)
 {
+	struct hv_util_service *srv = hv_get_drvdata(dev);
+
+	if (srv->util_deinit)
+		srv->util_deinit();
+	kfree(srv->recv_buffer);
+
 	return 0;
 }
 
 static const struct hv_vmbus_device_id id_table[] = {
 	/* Shutdown guid */
 	{ VMBUS_DEVICE(0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
-		       0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB) },
+		       0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB)
+	  .driver_data = (unsigned long)&util_shutdown },
 	/* Time synch guid */
 	{ VMBUS_DEVICE(0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
-		       0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf) },
+		       0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)
+	  .driver_data = (unsigned long)&util_timesynch },
 	/* Heartbeat guid */
 	{ VMBUS_DEVICE(0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
-		       0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d) },
+		       0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)
+	  .driver_data = (unsigned long)&util_heartbeat },
 	/* KVP guid */
 	{ VMBUS_DEVICE(0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
-		       0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3,  0xe6) },
+		       0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3,  0xe6)
+	  .driver_data = (unsigned long)&util_kvp },
 	{ },
 };
 
@@ -281,24 +328,11 @@ static int __init init_hyperv_utils(void)
 	int ret;
 	pr_info("Registering HyperV Utility Driver\n");
 
-	if (hv_kvp_init())
-		return -ENODEV;
-
-
-	shut_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
-	time_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
-	hbeat_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
-
-	if (!shut_txf_buf || !time_txf_buf || !hbeat_txf_buf) {
-		pr_info("Unable to allocate memory for receive buffer\n");
-		ret = -ENOMEM;
-		goto err;
-	}
 
 	ret = vmbus_driver_register(&util_drv);
 
 	if (ret != 0)
-		goto err;
+		return ret;
 
 	hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;
 
@@ -310,12 +344,6 @@ static int __init init_hyperv_utils(void)
 
 	return 0;
 
-err:
-	kfree(shut_txf_buf);
-	kfree(time_txf_buf);
-	kfree(hbeat_txf_buf);
-
-	return ret;
 }
 
 static void exit_hyperv_utils(void)
@@ -342,11 +370,6 @@ static void exit_hyperv_utils(void)
 			&chn_cb_negotiate;
 	hv_cb_utils[HV_KVP_MSG].callback = NULL;
 
-	hv_kvp_deinit();
-
-	kfree(shut_txf_buf);
-	kfree(time_txf_buf);
-	kfree(hbeat_txf_buf);
 	vmbus_driver_unregister(&util_drv);
 }
 
diff --git a/drivers/staging/hv/hyperv.h b/drivers/staging/hv/hyperv.h
index 91e557b..b0d7711 100644
--- a/drivers/staging/hv/hyperv.h
+++ b/drivers/staging/hv/hyperv.h
@@ -892,6 +892,20 @@ void vmbus_driver_unregister(struct hv_driver *hv_driver);
 #define HV_ERROR_NOT_SUPPORTED		0x80070032
 #define HV_ERROR_MACHINE_LOCKED		0x800704F7
 
+/*
+ * While we want to handle util services as regular devices,
+ * there is only one instance of each of these services; so
+ * we statically allocate the service specific state.
+ */
+
+struct hv_util_service {
+	u8 *recv_buffer;
+	char *service_name;
+	void (*util_cb)(void *);
+	int (*util_init)(struct hv_util_service *);
+	void (*util_deinit)(void);
+};
+
 struct vmbuspipe_hdr {
 	u32 flags;
 	u32 msgsize;
-- 
1.7.4.1

[PATCH 06/20] Staging: hv: util: Properly handle util services in the util driver

[K. Y. Srinivasan]

Now, properly handle util services in the util driver and eliminate code
that will not be necessary. In the current code, util services were
all handled not as other vmbus devices (net, block) but rather through
special handling (channel setup etc.). In this patch we handle all
services using the standard Linux Driver Model.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/channel_mgmt.c |   39 +-------------------------
 drivers/staging/hv/hv_kvp.c       |    7 ++++
 drivers/staging/hv/hv_util.c      |   56 +++++++++++-------------------------
 3 files changed, 25 insertions(+), 77 deletions(-)

diff --git a/drivers/staging/hv/channel_mgmt.c b/drivers/staging/hv/channel_mgmt.c
index c68e5fa..3c67e4c 100644
--- a/drivers/staging/hv/channel_mgmt.c
+++ b/drivers/staging/hv/channel_mgmt.c
@@ -181,24 +181,6 @@ void chn_cb_negotiate(void *context)
 	struct icmsg_hdr *icmsghdrp;
 	struct icmsg_negotiate *negop = NULL;
 
-	if (channel->util_index >= 0) {
-		/*
-		 * This is a properly initialized util channel.
-		 * Route this callback appropriately and setup state
-		 * so that we don't need to reroute again.
-		 */
-		if (hv_cb_utils[channel->util_index].callback != NULL) {
-			/*
-			 * The util driver has established a handler for
-			 * this service; do the magic.
-			 */
-			channel->onchannel_callback =
-			hv_cb_utils[channel->util_index].callback;
-			(hv_cb_utils[channel->util_index].callback)(channel);
-			return;
-		}
-	}
-
 	buflen = PAGE_SIZE;
 	buf = kmalloc(buflen, GFP_ATOMIC);
 
@@ -348,7 +330,6 @@ static void vmbus_process_offer(struct work_struct *work)
 	struct vmbus_channel *channel;
 	bool fnew = true;
 	int ret;
-	int cnt;
 	unsigned long flags;
 
 	/* The next possible work is rescind handling */
@@ -403,31 +384,13 @@ static void vmbus_process_offer(struct work_struct *work)
 		spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
 
 		free_channel(newchannel);
-	} else {
+	} else
 		/*
 		 * This state is used to indicate a successful open
 		 * so that when we do close the channel normally, we
 		 * can cleanup properly
 		 */
 		newchannel->state = CHANNEL_OPEN_STATE;
-		newchannel->util_index = -1; /* Invalid index */
-
-		/* Open IC channels */
-		for (cnt = 0; cnt < MAX_MSG_TYPES; cnt++) {
-			if (!uuid_le_cmp(newchannel->offermsg.offer.if_type,
-				   hv_cb_utils[cnt].data) &&
-				vmbus_open(newchannel, 2 * PAGE_SIZE,
-						 2 * PAGE_SIZE, NULL, 0,
-						 chn_cb_negotiate,
-						 newchannel) == 0) {
-				hv_cb_utils[cnt].channel = newchannel;
-				newchannel->util_index = cnt;
-
-				pr_info("%s\n", hv_cb_utils[cnt].log_msg);
-
-			}
-		}
-	}
 }
 
 /*
diff --git a/drivers/staging/hv/hv_kvp.c b/drivers/staging/hv/hv_kvp.c
index ff0d9ab..9aa9ede 100644
--- a/drivers/staging/hv/hv_kvp.c
+++ b/drivers/staging/hv/hv_kvp.c
@@ -177,6 +177,13 @@ kvp_respond_to_host(char *key, char *value, int error)
 	channel = kvp_transaction.recv_channel;
 	req_id = kvp_transaction.recv_req_id;
 
+	if (channel->onchannel_callback == NULL)
+		/*
+		 * We have raced with util driver being unloaded;
+		 * silently return.
+		 */
+		return;
+
 	icmsghdrp = (struct icmsg_hdr *)
 			&recv_buffer[sizeof(struct vmbuspipe_hdr)];
 	kvp_msg = (struct hv_kvp_msg *)
diff --git a/drivers/staging/hv/hv_util.c b/drivers/staging/hv/hv_util.c
index f082e5a..31abe9e 100644
--- a/drivers/staging/hv/hv_util.c
+++ b/drivers/staging/hv/hv_util.c
@@ -273,19 +273,33 @@ static int util_probe(struct hv_device *dev,
 	if (srv->util_init) {
 		ret = srv->util_init(srv);
 		if (ret) {
-			kfree(srv->recv_buffer);
-			return -ENODEV;
+			ret = -ENODEV;
+			goto error1;
 		}
 	}
 
+	ret = vmbus_open(dev->channel, 2 * PAGE_SIZE, 2 * PAGE_SIZE, NULL, 0,
+			srv->util_cb, dev->channel);
+	if (ret)
+		goto error;
+
+	pr_info("%s", srv->service_name);
 	hv_set_drvdata(dev, srv);
 	return 0;
+
+error:
+	if (srv->util_deinit)
+		srv->util_deinit();
+error1:
+	kfree(srv->recv_buffer);
+	return ret;
 }
 
 static int util_remove(struct hv_device *dev)
 {
 	struct hv_util_service *srv = hv_get_drvdata(dev);
 
+	vmbus_close(dev->channel);
 	if (srv->util_deinit)
 		srv->util_deinit();
 	kfree(srv->recv_buffer);
@@ -325,51 +339,15 @@ static  struct hv_driver util_drv = {
 
 static int __init init_hyperv_utils(void)
 {
-	int ret;
 	pr_info("Registering HyperV Utility Driver\n");
 
-
-	ret = vmbus_driver_register(&util_drv);
-
-	if (ret != 0)
-		return ret;
-
-	hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;
-
-	hv_cb_utils[HV_TIMESYNC_MSG].callback = &timesync_onchannelcallback;
-
-	hv_cb_utils[HV_HEARTBEAT_MSG].callback = &heartbeat_onchannelcallback;
-
-	hv_cb_utils[HV_KVP_MSG].callback = &hv_kvp_onchannelcallback;
-
-	return 0;
-
+	return vmbus_driver_register(&util_drv);
 }
 
 static void exit_hyperv_utils(void)
 {
 	pr_info("De-Registered HyperV Utility Driver\n");
 
-	if (hv_cb_utils[HV_SHUTDOWN_MSG].channel != NULL)
-		hv_cb_utils[HV_SHUTDOWN_MSG].channel->onchannel_callback =
-			&chn_cb_negotiate;
-	hv_cb_utils[HV_SHUTDOWN_MSG].callback = NULL;
-
-	if (hv_cb_utils[HV_TIMESYNC_MSG].channel != NULL)
-		hv_cb_utils[HV_TIMESYNC_MSG].channel->onchannel_callback =
-			&chn_cb_negotiate;
-	hv_cb_utils[HV_TIMESYNC_MSG].callback = NULL;
-
-	if (hv_cb_utils[HV_HEARTBEAT_MSG].channel != NULL)
-		hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback =
-			&chn_cb_negotiate;
-	hv_cb_utils[HV_HEARTBEAT_MSG].callback = NULL;
-
-	if (hv_cb_utils[HV_KVP_MSG].channel != NULL)
-		hv_cb_utils[HV_KVP_MSG].channel->onchannel_callback =
-			&chn_cb_negotiate;
-	hv_cb_utils[HV_KVP_MSG].callback = NULL;
-
 	vmbus_driver_unregister(&util_drv);
 }
 
-- 
1.7.4.1

[PATCH 07/20] Staging: hv: vmbus: Get rid of hv_cb_utils[] and other unneeded code

[K. Y. Srinivasan]

Now that the transformation of the util driver is complete,
get rid of hv_cb_utils[] and other unneeded code.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/channel_mgmt.c |   94 -------------------------------------
 drivers/staging/hv/hyperv.h       |   13 -----
 2 files changed, 0 insertions(+), 107 deletions(-)

diff --git a/drivers/staging/hv/channel_mgmt.c b/drivers/staging/hv/channel_mgmt.c
index 3c67e4c..f20cd84 100644
--- a/drivers/staging/hv/channel_mgmt.c
+++ b/drivers/staging/hv/channel_mgmt.c
@@ -158,100 +158,6 @@ void prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
 }
 EXPORT_SYMBOL(prep_negotiate_resp);
 
-/**
- * chn_cb_negotiate() - Default handler for non IDE/SCSI/NETWORK
- * Hyper-V requests
- * @context: Pointer to argument structure.
- *
- * Set up the default handler for non device driver specific requests
- * from Hyper-V. This stub responds to the default negotiate messages
- * that come in for every non IDE/SCSI/Network request.
- * This behavior is normally overwritten in the hv_utils driver. That
- * driver handles requests like graceful shutdown, heartbeats etc.
- *
- * Mainly used by Hyper-V drivers.
- */
-void chn_cb_negotiate(void *context)
-{
-	struct vmbus_channel *channel = context;
-	u8 *buf;
-	u32 buflen, recvlen;
-	u64 requestid;
-
-	struct icmsg_hdr *icmsghdrp;
-	struct icmsg_negotiate *negop = NULL;
-
-	buflen = PAGE_SIZE;
-	buf = kmalloc(buflen, GFP_ATOMIC);
-
-	vmbus_recvpacket(channel, buf, buflen, &recvlen, &requestid);
-
-	if (recvlen > 0) {
-		icmsghdrp = (struct icmsg_hdr *)&buf[
-			sizeof(struct vmbuspipe_hdr)];
-
-		prep_negotiate_resp(icmsghdrp, negop, buf);
-
-		icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
-			| ICMSGHDRFLAG_RESPONSE;
-
-		vmbus_sendpacket(channel, buf,
-				       recvlen, requestid,
-				       VM_PKT_DATA_INBAND, 0);
-	}
-
-	kfree(buf);
-}
-EXPORT_SYMBOL(chn_cb_negotiate);
-
-/*
- * Function table used for message responses for non IDE/SCSI/Network type
- * messages. (Such as KVP/Shutdown etc)
- */
-struct hyperv_service_callback hv_cb_utils[MAX_MSG_TYPES] = {
-	/* 0E0B6031-5213-4934-818B-38D90CED39DB */
-	/* Shutdown */
-	{
-		.msg_type = HV_SHUTDOWN_MSG,
-		.data.b = {
-			0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
-			0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
-		},
-		.log_msg = "Shutdown channel functionality initialized"
-	},
-
-	/* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
-	/* TimeSync */
-	{
-		.msg_type = HV_TIMESYNC_MSG,
-		.data.b = {
-			0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
-			0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
-		},
-		.log_msg = "Timesync channel functionality initialized"
-	},
-	/* {57164f39-9115-4e78-ab55-382f3bd5422d} */
-	/* Heartbeat */
-	{
-		.msg_type = HV_HEARTBEAT_MSG,
-		.data.b = {
-			0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
-			0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
-		},
-		.log_msg = "Heartbeat channel functionality initialized"
-	},
-	/* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
-	/* KVP */
-	{
-		.data.b = {
-			0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
-			0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3,  0xe6
-		},
-		.log_msg = "KVP channel functionality initialized"
-	},
-};
-EXPORT_SYMBOL(hv_cb_utils);
-
 /*
  * alloc_channel - Allocate and initialize a vmbus channel object
  */
diff --git a/drivers/staging/hv/hyperv.h b/drivers/staging/hv/hyperv.h
index b0d7711..e51341f 100644
--- a/drivers/staging/hv/hyperv.h
+++ b/drivers/staging/hv/hyperv.h
@@ -581,11 +581,6 @@ struct vmbus_channel {
 	struct work_struct work;
 
 	enum vmbus_channel_state state;
-	/*
-	 * For util channels, stash the
-	 * the service index for easy access.
-	 */
-	s8 util_index;
 
 	struct vmbus_channel_offer_channel offermsg;
 	/*
@@ -964,12 +959,6 @@ struct ictimesync_data {
 	u8 flags;
 } __packed;
 
-/* Index for each IC struct in array hv_cb_utils[] */
-#define HV_SHUTDOWN_MSG		0
-#define HV_TIMESYNC_MSG		1
-#define HV_HEARTBEAT_MSG	2
-#define HV_KVP_MSG		3
-
 struct hyperv_service_callback {
 	u8 msg_type;
 	char *log_msg;
@@ -980,7 +969,5 @@ struct hyperv_service_callback {
 
 extern void prep_negotiate_resp(struct icmsg_hdr *,
 				struct icmsg_negotiate *, u8 *);
-extern void chn_cb_negotiate(void *);
-extern struct hyperv_service_callback hv_cb_utils[];
 
 #endif /* _HYPERV_H */
-- 
1.7.4.1

[PATCH 08/20] Staging: hv: vmbus: Cleanup vmbus_remove()

[K. Y. Srinivasan]

vmbus_remove() cannot fail; clean it up accordingly.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/vmbus_drv.c |   20 ++++++--------------
 1 files changed, 6 insertions(+), 14 deletions(-)

diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c
index 2fccb1f..466425a 100644
--- a/drivers/staging/hv/vmbus_drv.c
+++ b/drivers/staging/hv/vmbus_drv.c
@@ -334,22 +334,14 @@ static int vmbus_probe(struct device *child_device)
  */
 static int vmbus_remove(struct device *child_device)
 {
-	int ret;
-	struct hv_driver *drv;
-
+	struct hv_driver *drv = drv_to_hv_drv(child_device->driver);
 	struct hv_device *dev = device_to_hv_device(child_device);
 
-	if (child_device->driver) {
-		drv = drv_to_hv_drv(child_device->driver);
-
-		if (drv->remove) {
-			ret = drv->remove(dev);
-		} else {
-			pr_err("remove not set for driver %s\n",
-				dev_name(child_device));
-			ret = -ENODEV;
-		}
-	}
+	if (drv->remove)
+		drv->remove(dev);
+	else
+		pr_err("remove not set for driver %s\n",
+			dev_name(child_device));
 
 	return 0;
 }
-- 
1.7.4.1

[PATCH 09/20] Staging: hv: storvsc: Get rid of storvsc_dev_add() by inlining the code

[K. Y. Srinivasan]

Get rid of storvsc_dev_add() by inlining the code.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/storvsc_drv.c |   58 +++++++++----------------------------
 1 files changed, 14 insertions(+), 44 deletions(-)

diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index b996293..2210c8c 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -651,41 +651,6 @@ static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
 	return ret;
 }
 
-static int storvsc_dev_add(struct hv_device *device,
-					void *additional_info)
-{
-	struct storvsc_device *stor_device;
-	struct storvsc_device_info *device_info;
-	int ret = 0;
-
-	device_info = (struct storvsc_device_info *)additional_info;
-	stor_device = alloc_stor_device(device);
-	if (!stor_device)
-		return -ENOMEM;
-
-	/* Save the channel properties to our storvsc channel */
-
-	/*
-	 * If we support more than 1 scsi channel, we need to set the
-	 * port number here to the scsi channel but how do we get the
-	 * scsi channel prior to the bus scan.
-	 *
-	 * The host does not support this.
-	 */
-
-	stor_device->port_number = device_info->port_number;
-	/* Send it back up */
-	ret = storvsc_connect_to_vsp(device, device_info->ring_buffer_size);
-	if (ret) {
-		kfree(stor_device);
-		return ret;
-	}
-	device_info->path_id = stor_device->path_id;
-	device_info->target_id = stor_device->target_id;
-
-	return ret;
-}
-
 static int storvsc_dev_remove(struct hv_device *device)
 {
 	struct storvsc_device *stor_device;
@@ -1389,10 +1354,10 @@ static int storvsc_probe(struct hv_device *device,
 	int ret;
 	struct Scsi_Host *host;
 	struct hv_host_device *host_dev;
-	struct storvsc_device_info device_info;
 	bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
 	int path = 0;
 	int target = 0;
+	struct storvsc_device *stor_device;
 
 	host = scsi_host_alloc(&scsi_driver,
 			       sizeof(struct hv_host_device));
@@ -1417,22 +1382,27 @@ static int storvsc_probe(struct hv_device *device,
 		return -ENOMEM;
 	}
 
-	device_info.port_number = host->host_no;
-	device_info.ring_buffer_size  = storvsc_ringbuffer_size;
-	/* Call to the vsc driver to add the device */
-	ret = storvsc_dev_add(device, (void *)&device_info);
+	stor_device = alloc_stor_device(device);
+	if (!stor_device) {
+		kmem_cache_destroy(host_dev->request_pool);
+		scsi_host_put(host);
+		return -ENOMEM;
+	}
 
-	if (ret != 0) {
+	stor_device->port_number = host->host_no;
+	ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
+	if (ret) {
 		kmem_cache_destroy(host_dev->request_pool);
 		scsi_host_put(host);
-		return -ENODEV;
+		kfree(stor_device);
+		return ret;
 	}
 
 	if (dev_is_ide)
 		storvsc_get_ide_info(device, &target, &path);
 
-	host_dev->path = device_info.path_id;
-	host_dev->target = device_info.target_id;
+	host_dev->path = stor_device->path_id;
+	host_dev->target = stor_device->target_id;
 
 	/* max # of devices per target */
 	host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
-- 
1.7.4.1

[PATCH 10/20] Staging: hv: storvsc: Get rid of alloc_stor_device() by inlining the code

[K. Y. Srinivasan]

Get rid of alloc_stor_device() by inlining the code.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/storvsc_drv.c |   24 ++++++------------------
 1 files changed, 6 insertions(+), 18 deletions(-)

diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 2210c8c..ce8652e 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -332,23 +332,6 @@ static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
 	dev->drain_notify = false;
 }
 
-static inline struct storvsc_device *alloc_stor_device(struct hv_device *device)
-{
-	struct storvsc_device *stor_device;
-
-	stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
-	if (!stor_device)
-		return NULL;
-
-	stor_device->destroy = false;
-	init_waitqueue_head(&stor_device->waiting_to_drain);
-	stor_device->device = device;
-	device->ext = stor_device;
-
-	return stor_device;
-}
-
-
 static inline struct storvsc_device *get_in_stor_device(
 					struct hv_device *device)
 {
@@ -1382,13 +1365,18 @@ static int storvsc_probe(struct hv_device *device,
 		return -ENOMEM;
 	}
 
-	stor_device = alloc_stor_device(device);
+	stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
 	if (!stor_device) {
 		kmem_cache_destroy(host_dev->request_pool);
 		scsi_host_put(host);
 		return -ENOMEM;
 	}
 
+	stor_device->destroy = false;
+	init_waitqueue_head(&stor_device->waiting_to_drain);
+	stor_device->device = device;
+	device->ext = stor_device;
+
 	stor_device->port_number = host->host_no;
 	ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
 	if (ret) {
-- 
1.7.4.1

[PATCH 11/20] Staging: hv: storvsc: Get rid of some unnecessary state and definitions

[K. Y. Srinivasan]

Now, get rid of some unnecessary state and definitions.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/storvsc_drv.c |    9 ---------
 1 files changed, 0 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index ce8652e..5e306a5 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -245,7 +245,6 @@ enum storvsc_request_type {
 
 
 struct hv_storvsc_request {
-	struct hv_storvsc_request *request;
 	struct hv_device *device;
 
 	/* Synchronize the request/response if needed */
@@ -260,14 +259,6 @@ struct hv_storvsc_request {
 };
 
 
-struct storvsc_device_info {
-	u32 ring_buffer_size;
-	unsigned int port_number;
-	unsigned char path_id;
-	unsigned char target_id;
-};
-
-
 /* A storvsc device is a device object that contains a vmbus channel */
 struct storvsc_device {
 	struct hv_device *device;
-- 
1.7.4.1

[PATCH 12/20] Staging: hv: storvsc: Eliminate the usage of ext field in struct hv_device

[K. Y. Srinivasan]

Now, eliminate the usage of ext field in struct  hv_device for storvsc driver.
We do this by registering pointer to struct storvsc_device as the driver
specific data and eliminating the current usage of driver specific data to
save and retrieve the pointer to struct Scsi_Host.
Additionally, all access to the driver specific data is through
the vmbus wrapper functions. Note that function to allocate the host
gives us a reference on the host object.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/storvsc_drv.c |   20 ++++++++++----------
 1 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 5e306a5..807c94d 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -266,6 +266,7 @@ struct storvsc_device {
 	bool	 destroy;
 	bool	 drain_notify;
 	atomic_t num_outstanding_req;
+	struct Scsi_Host *host;
 
 	wait_queue_head_t waiting_to_drain;
 
@@ -306,7 +307,7 @@ static inline struct storvsc_device *get_out_stor_device(
 {
 	struct storvsc_device *stor_device;
 
-	stor_device = (struct storvsc_device *)device->ext;
+	stor_device = hv_get_drvdata(device);
 
 	if (stor_device && stor_device->destroy)
 		stor_device = NULL;
@@ -328,7 +329,7 @@ static inline struct storvsc_device *get_in_stor_device(
 {
 	struct storvsc_device *stor_device;
 
-	stor_device = (struct storvsc_device *)device->ext;
+	stor_device = hv_get_drvdata(device);
 
 	if (!stor_device)
 		goto get_in_err;
@@ -480,8 +481,7 @@ static void storvsc_on_io_completion(struct hv_device *device,
 	struct storvsc_device *stor_device;
 	struct vstor_packet *stor_pkt;
 
-	stor_device = (struct storvsc_device *)device->ext;
-
+	stor_device = hv_get_drvdata(device);
 	stor_pkt = &request->vstor_packet;
 
 	/*
@@ -630,7 +630,7 @@ static int storvsc_dev_remove(struct hv_device *device)
 	struct storvsc_device *stor_device;
 	unsigned long flags;
 
-	stor_device = (struct storvsc_device *)device->ext;
+	stor_device = hv_get_drvdata(device);
 
 	spin_lock_irqsave(&device->channel->inbound_lock, flags);
 	stor_device->destroy = true;
@@ -652,7 +652,7 @@ static int storvsc_dev_remove(struct hv_device *device)
 	 * allow incoming packets.
 	 */
 	spin_lock_irqsave(&device->channel->inbound_lock, flags);
-	device->ext = NULL;
+	hv_set_drvdata(device, NULL);
 	spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
 
 	/* Close the channel */
@@ -962,7 +962,8 @@ static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
 
 static int storvsc_remove(struct hv_device *dev)
 {
-	struct Scsi_Host *host = dev_get_drvdata(&dev->device);
+	struct storvsc_device *stor_device = hv_get_drvdata(dev);
+	struct Scsi_Host *host = stor_device->host;
 	struct hv_host_device *host_dev =
 			(struct hv_host_device *)host->hostdata;
 
@@ -1338,8 +1339,6 @@ static int storvsc_probe(struct hv_device *device,
 	if (!host)
 		return -ENOMEM;
 
-	dev_set_drvdata(&device->device, host);
-
 	host_dev = (struct hv_host_device *)host->hostdata;
 	memset(host_dev, 0, sizeof(struct hv_host_device));
 
@@ -1366,7 +1365,8 @@ static int storvsc_probe(struct hv_device *device,
 	stor_device->destroy = false;
 	init_waitqueue_head(&stor_device->waiting_to_drain);
 	stor_device->device = device;
-	device->ext = stor_device;
+	stor_device->host = host;
+	hv_set_drvdata(device, stor_device);
 
 	stor_device->port_number = host->host_no;
 	ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
-- 
1.7.4.1

[PATCH 13/20] Staging: hv: netvsc: Get rid of the usage of the ext field in struct hv_device

[K. Y. Srinivasan]

Now, eliminate the usage of ext field in struct  hv_device for netvsc driver.
We do this by registering pointer to struct netvsc_device as the driver
specific data and eliminating the current usage of driver specific data
to save and retrieve the pointer to struct net_device.
Additionally, all access to the driver specific data is through
the vmbus wrapper functions. As part of this cleanup, we also get rid
of some unnecessary debug print statements.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/hyperv_net.h   |    2 +
 drivers/staging/hv/netvsc.c       |   86 ++++++++++++++++++------------------
 drivers/staging/hv/netvsc_drv.c   |   24 ++++++++--
 drivers/staging/hv/rndis_filter.c |   28 ++++++++----
 4 files changed, 83 insertions(+), 57 deletions(-)

diff --git a/drivers/staging/hv/hyperv_net.h b/drivers/staging/hv/hyperv_net.h
index af8a37f..366dd2b 100644
--- a/drivers/staging/hv/hyperv_net.h
+++ b/drivers/staging/hv/hyperv_net.h
@@ -392,6 +392,8 @@ struct netvsc_device {
 	struct nvsp_message revoke_packet;
 	/* unsigned char HwMacAddr[HW_MACADDR_LEN]; */
 
+	struct net_device *ndev;
+
 	/* Holds rndis device info */
 	void *extension;
 };
diff --git a/drivers/staging/hv/netvsc.c b/drivers/staging/hv/netvsc.c
index 115629f..2bcc8b2 100644
--- a/drivers/staging/hv/netvsc.c
+++ b/drivers/staging/hv/netvsc.c
@@ -35,6 +35,7 @@
 static struct netvsc_device *alloc_net_device(struct hv_device *device)
 {
 	struct netvsc_device *net_device;
+	struct net_device *ndev = hv_get_drvdata(device);
 
 	net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
 	if (!net_device)
@@ -43,8 +44,9 @@ static struct netvsc_device *alloc_net_device(struct hv_device *device)
 
 	net_device->destroy = false;
 	net_device->dev = device;
-	device->ext = net_device;
+	net_device->ndev = ndev;
 
+	hv_set_drvdata(device, net_device);
 	return net_device;
 }
 
@@ -52,7 +54,7 @@ static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
 {
 	struct netvsc_device *net_device;
 
-	net_device = device->ext;
+	net_device = hv_get_drvdata(device);
 	if (net_device && net_device->destroy)
 		net_device = NULL;
 
@@ -63,7 +65,7 @@ static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
 {
 	struct netvsc_device *net_device;
 
-	net_device = device->ext;
+	net_device = hv_get_drvdata(device);
 
 	if (!net_device)
 		goto get_in_err;
@@ -81,7 +83,7 @@ static int netvsc_destroy_recv_buf(struct netvsc_device *net_device)
 {
 	struct nvsp_message *revoke_packet;
 	int ret = 0;
-	struct net_device *ndev = dev_get_drvdata(&net_device->dev->device);
+	struct net_device *ndev = net_device->ndev;
 
 	/*
 	 * If we got a section count, it means we received a
@@ -153,14 +155,12 @@ static int netvsc_init_recv_buf(struct hv_device *device)
 	int t;
 	struct netvsc_device *net_device;
 	struct nvsp_message *init_packet;
-	struct net_device *ndev = dev_get_drvdata(&device->device);
+	struct net_device *ndev;
 
 	net_device = get_outbound_net_device(device);
-	if (!net_device) {
-		netdev_err(ndev, "unable to get net device..."
-			   "device being destroyed?\n");
+	if (!net_device)
 		return -ENODEV;
-	}
+	ndev = net_device->ndev;
 
 	net_device->recv_buf =
 		(void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
@@ -269,14 +269,12 @@ static int netvsc_connect_vsp(struct hv_device *device)
 	struct netvsc_device *net_device;
 	struct nvsp_message *init_packet;
 	int ndis_version;
-	struct net_device *ndev = dev_get_drvdata(&device->device);
+	struct net_device *ndev;
 
 	net_device = get_outbound_net_device(device);
-	if (!net_device) {
-		netdev_err(ndev, "unable to get net device..."
-			   "device being destroyed?\n");
+	if (!net_device)
 		return -ENODEV;
-	}
+	ndev = net_device->ndev;
 
 	init_packet = &net_device->channel_init_pkt;
 
@@ -357,7 +355,7 @@ int netvsc_device_remove(struct hv_device *device)
 	struct hv_netvsc_packet *netvsc_packet, *pos;
 	unsigned long flags;
 
-	net_device = (struct netvsc_device *)device->ext;
+	net_device = hv_get_drvdata(device);
 	spin_lock_irqsave(&device->channel->inbound_lock, flags);
 	net_device->destroy = true;
 	spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
@@ -381,7 +379,7 @@ int netvsc_device_remove(struct hv_device *device)
 	 */
 
 	spin_lock_irqsave(&device->channel->inbound_lock, flags);
-	device->ext = NULL;
+	hv_set_drvdata(device, NULL);
 	spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
 
 	/* At this point, no one should be accessing netDevice except in here */
@@ -407,14 +405,12 @@ static void netvsc_send_completion(struct hv_device *device,
 	struct netvsc_device *net_device;
 	struct nvsp_message *nvsp_packet;
 	struct hv_netvsc_packet *nvsc_packet;
-	struct net_device *ndev = dev_get_drvdata(&device->device);
+	struct net_device *ndev;
 
 	net_device = get_inbound_net_device(device);
-	if (!net_device) {
-		netdev_err(ndev, "unable to get net device..."
-			   "device being destroyed?\n");
+	if (!net_device)
 		return;
-	}
+	ndev = net_device->ndev;
 
 	nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
 			(packet->offset8 << 3));
@@ -452,14 +448,12 @@ int netvsc_send(struct hv_device *device,
 	struct netvsc_device *net_device;
 	int ret = 0;
 	struct nvsp_message sendMessage;
-	struct net_device *ndev = dev_get_drvdata(&device->device);
+	struct net_device *ndev;
 
 	net_device = get_outbound_net_device(device);
-	if (!net_device) {
-		netdev_err(ndev, "net device (%p) shutting down..."
-			   "ignoring outbound packets\n", net_device);
+	if (!net_device)
 		return -ENODEV;
-	}
+	ndev = net_device->ndev;
 
 	sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
 	if (packet->is_data_pkt) {
@@ -506,7 +500,10 @@ static void netvsc_send_recv_completion(struct hv_device *device,
 	struct nvsp_message recvcompMessage;
 	int retries = 0;
 	int ret;
-	struct net_device *ndev = dev_get_drvdata(&device->device);
+	struct net_device *ndev;
+	struct netvsc_device *net_device = hv_get_drvdata(device);
+
+	ndev = net_device->ndev;
 
 	recvcompMessage.hdr.msg_type =
 				NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
@@ -552,7 +549,7 @@ static void netvsc_receive_completion(void *context)
 	u64 transaction_id = 0;
 	bool fsend_receive_comp = false;
 	unsigned long flags;
-	struct net_device *ndev = dev_get_drvdata(&device->device);
+	struct net_device *ndev;
 
 	/*
 	 * Even though it seems logical to do a GetOutboundNetDevice() here to
@@ -560,11 +557,9 @@ static void netvsc_receive_completion(void *context)
 	 * since we may have disable outbound traffic already.
 	 */
 	net_device = get_inbound_net_device(device);
-	if (!net_device) {
-		netdev_err(ndev, "unable to get net device..."
-			   "device being destroyed?\n");
+	if (!net_device)
 		return;
-	}
+	ndev = net_device->ndev;
 
 	/* Overloading use of the lock. */
 	spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
@@ -607,16 +602,14 @@ static void netvsc_receive(struct hv_device *device,
 	int i, j;
 	int count = 0, bytes_remain = 0;
 	unsigned long flags;
-	struct net_device *ndev = dev_get_drvdata(&device->device);
+	struct net_device *ndev;
 
 	LIST_HEAD(listHead);
 
 	net_device = get_inbound_net_device(device);
-	if (!net_device) {
-		netdev_err(ndev, "unable to get net device..."
-			   "device being destroyed?\n");
+	if (!net_device)
 		return;
-	}
+	ndev = net_device->ndev;
 
 	/*
 	 * All inbound packets other than send completion should be xfer page
@@ -784,7 +777,7 @@ static void netvsc_channel_cb(void *context)
 	struct vmpacket_descriptor *desc;
 	unsigned char *buffer;
 	int bufferlen = NETVSC_PACKET_SIZE;
-	struct net_device *ndev = dev_get_drvdata(&device->device);
+	struct net_device *ndev;
 
 	packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
 			 GFP_ATOMIC);
@@ -793,11 +786,9 @@ static void netvsc_channel_cb(void *context)
 	buffer = packet;
 
 	net_device = get_inbound_net_device(device);
-	if (!net_device) {
-		netdev_err(ndev, "net device (%p) shutting down..."
-			   "ignoring inbound packets\n", net_device);
+	if (!net_device)
 		goto out;
-	}
+	ndev = net_device->ndev;
 
 	do {
 		ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
@@ -871,7 +862,7 @@ int netvsc_device_add(struct hv_device *device, void *additional_info)
 	((struct netvsc_device_info *)additional_info)->ring_size;
 	struct netvsc_device *net_device;
 	struct hv_netvsc_packet *packet, *pos;
-	struct net_device *ndev = dev_get_drvdata(&device->device);
+	struct net_device *ndev;
 
 	net_device = alloc_net_device(device);
 	if (!net_device) {
@@ -879,6 +870,15 @@ int netvsc_device_add(struct hv_device *device, void *additional_info)
 		goto cleanup;
 	}
 
+	/*
+	 * Coming into this function, struct net_device * is
+	 * registered as the driver private data.
+	 * In alloc_net_device(), we register struct netvsc_device *
+	 * as the driver private data and stash away struct net_device *
+	 * in struct netvsc_device *.
+	 */
+	ndev = net_device->ndev;
+
 	/* Initialize the NetVSC channel extension */
 	net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
 	spin_lock_init(&net_device->recv_pkt_list_lock);
diff --git a/drivers/staging/hv/netvsc_drv.c b/drivers/staging/hv/netvsc_drv.c
index d06cde2..69c233e 100644
--- a/drivers/staging/hv/netvsc_drv.c
+++ b/drivers/staging/hv/netvsc_drv.c
@@ -203,8 +203,12 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 void netvsc_linkstatus_callback(struct hv_device *device_obj,
 				       unsigned int status)
 {
-	struct net_device *net = dev_get_drvdata(&device_obj->device);
+	struct net_device *net;
 	struct net_device_context *ndev_ctx;
+	struct netvsc_device *net_device;
+
+	net_device = hv_get_drvdata(device_obj);
+	net = net_device->ndev;
 
 	if (!net) {
 		netdev_err(net, "got link status but net device "
@@ -236,6 +240,10 @@ int netvsc_recv_callback(struct hv_device *device_obj,
 	void *data;
 	int i;
 	unsigned long flags;
+	struct netvsc_device *net_device;
+
+	net_device = hv_get_drvdata(device_obj);
+	net = net_device->ndev;
 
 	if (!net) {
 		netdev_err(net, "got receive callback but net device"
@@ -322,9 +330,11 @@ static void netvsc_send_garp(struct work_struct *w)
 {
 	struct net_device_context *ndev_ctx;
 	struct net_device *net;
+	struct netvsc_device *net_device;
 
 	ndev_ctx = container_of(w, struct net_device_context, dwork.work);
-	net = dev_get_drvdata(&ndev_ctx->device_ctx->device);
+	net_device = hv_get_drvdata(ndev_ctx->device_ctx);
+	net = net_device->ndev;
 	netif_notify_peers(net);
 }
 
@@ -347,7 +357,7 @@ static int netvsc_probe(struct hv_device *dev,
 	net_device_ctx = netdev_priv(net);
 	net_device_ctx->device_ctx = dev;
 	atomic_set(&net_device_ctx->avail, ring_size);
-	dev_set_drvdata(&dev->device, net);
+	hv_set_drvdata(dev, net);
 	INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_send_garp);
 
 	net->netdev_ops = &device_ops;
@@ -373,7 +383,7 @@ static int netvsc_probe(struct hv_device *dev,
 		netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
 		unregister_netdev(net);
 		free_netdev(net);
-		dev_set_drvdata(&dev->device, NULL);
+		hv_set_drvdata(dev, NULL);
 		return ret;
 	}
 	memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
@@ -386,8 +396,12 @@ out:
 
 static int netvsc_remove(struct hv_device *dev)
 {
-	struct net_device *net = dev_get_drvdata(&dev->device);
+	struct net_device *net;
 	struct net_device_context *ndev_ctx;
+	struct netvsc_device *net_device;
+
+	net_device = hv_get_drvdata(dev);
+	net = net_device->ndev;
 
 	if (net == NULL) {
 		dev_err(&dev->device, "No net device to remove\n");
diff --git a/drivers/staging/hv/rndis_filter.c b/drivers/staging/hv/rndis_filter.c
index b325345..b354b0b 100644
--- a/drivers/staging/hv/rndis_filter.c
+++ b/drivers/staging/hv/rndis_filter.c
@@ -141,7 +141,11 @@ static void put_rndis_request(struct rndis_device *dev,
 static void dump_rndis_message(struct hv_device *hv_dev,
 			struct rndis_message *rndis_msg)
 {
-	struct net_device *netdev = dev_get_drvdata(&hv_dev->device);
+	struct net_device *netdev;
+	struct netvsc_device *net_device;
+
+	net_device = hv_get_drvdata(hv_dev);
+	netdev = net_device->ndev;
 
 	switch (rndis_msg->ndis_msg_type) {
 	case REMOTE_NDIS_PACKET_MSG:
@@ -249,7 +253,9 @@ static void rndis_filter_receive_response(struct rndis_device *dev,
 	struct rndis_request *request = NULL;
 	bool found = false;
 	unsigned long flags;
-	struct net_device *ndev = dev_get_drvdata(&dev->net_dev->dev->device);
+	struct net_device *ndev;
+
+	ndev = dev->net_dev->ndev;
 
 	spin_lock_irqsave(&dev->request_lock, flags);
 	list_for_each_entry(request, &dev->req_list, list_ent) {
@@ -356,11 +362,13 @@ static void rndis_filter_receive_data(struct rndis_device *dev,
 int rndis_filter_receive(struct hv_device *dev,
 				struct hv_netvsc_packet	*pkt)
 {
-	struct netvsc_device *net_dev = dev->ext;
+	struct netvsc_device *net_dev = hv_get_drvdata(dev);
 	struct rndis_device *rndis_dev;
 	struct rndis_message rndis_msg;
 	struct rndis_message *rndis_hdr;
-	struct net_device *ndev = dev_get_drvdata(&dev->device);
+	struct net_device *ndev;
+
+	ndev = net_dev->ndev;
 
 	if (!net_dev)
 		return -EINVAL;
@@ -517,7 +525,9 @@ static int rndis_filter_set_packet_filter(struct rndis_device *dev,
 	struct rndis_set_complete *set_complete;
 	u32 status;
 	int ret, t;
-	struct net_device *ndev = dev_get_drvdata(&dev->net_dev->dev->device);
+	struct net_device *ndev;
+
+	ndev = dev->net_dev->ndev;
 
 	request = get_rndis_request(dev, REMOTE_NDIS_SET_MSG,
 			RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
@@ -700,7 +710,7 @@ int rndis_filter_device_add(struct hv_device *dev,
 
 
 	/* Initialize the rndis device */
-	netDevice = dev->ext;
+	netDevice = hv_get_drvdata(dev);
 
 	netDevice->extension = rndisDevice;
 	rndisDevice->net_dev = netDevice;
@@ -737,7 +747,7 @@ int rndis_filter_device_add(struct hv_device *dev,
 
 void rndis_filter_device_remove(struct hv_device *dev)
 {
-	struct netvsc_device *net_dev = dev->ext;
+	struct netvsc_device *net_dev = hv_get_drvdata(dev);
 	struct rndis_device *rndis_dev = net_dev->extension;
 
 	/* Halt and release the rndis device */
@@ -752,7 +762,7 @@ void rndis_filter_device_remove(struct hv_device *dev)
 
 int rndis_filter_open(struct hv_device *dev)
 {
-	struct netvsc_device *netDevice = dev->ext;
+	struct netvsc_device *netDevice = hv_get_drvdata(dev);
 
 	if (!netDevice)
 		return -EINVAL;
@@ -762,7 +772,7 @@ int rndis_filter_open(struct hv_device *dev)
 
 int rndis_filter_close(struct hv_device *dev)
 {
-	struct netvsc_device *netDevice = dev->ext;
+	struct netvsc_device *netDevice = hv_get_drvdata(dev);
 
 	if (!netDevice)
 		return -EINVAL;
-- 
1.7.4.1

[PATCH 14/20] Staging: hv: mousevsc: Get rid of the usage of the ext field in struct hv_device

[K. Y. Srinivasan]

Get rid of the usage of the ext field in struct hv_device for the mouse driver.
We do this by using the newly introduced functions to set and and get driver
specific data.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/hv_mouse.c |   18 +++++++++---------
 1 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/hv/hv_mouse.c b/drivers/staging/hv/hv_mouse.c
index 5ff8a03..fcb023a 100644
--- a/drivers/staging/hv/hv_mouse.c
+++ b/drivers/staging/hv/hv_mouse.c
@@ -196,7 +196,7 @@ static struct mousevsc_dev *alloc_input_device(struct hv_device *device)
 	atomic_cmpxchg(&input_dev->ref_count, 0, 2);
 
 	input_dev->device = device;
-	device->ext = input_dev;
+	hv_set_drvdata(device, input_dev);
 
 	return input_dev;
 }
@@ -214,7 +214,7 @@ static struct mousevsc_dev *get_input_device(struct hv_device *device)
 {
 	struct mousevsc_dev *input_dev;
 
-	input_dev = (struct mousevsc_dev *)device->ext;
+	input_dev = hv_get_drvdata(device);
 
 /*
  *	FIXME
@@ -240,7 +240,7 @@ static struct mousevsc_dev *must_get_input_device(struct hv_device *device)
 {
 	struct mousevsc_dev *input_dev;
 
-	input_dev = (struct mousevsc_dev *)device->ext;
+	input_dev = hv_get_drvdata(device);
 
 	if (input_dev && atomic_read(&input_dev->ref_count))
 		atomic_inc(&input_dev->ref_count);
@@ -254,7 +254,7 @@ static void put_input_device(struct hv_device *device)
 {
 	struct mousevsc_dev *input_dev;
 
-	input_dev = (struct mousevsc_dev *)device->ext;
+	input_dev = hv_get_drvdata(device);
 
 	atomic_dec(&input_dev->ref_count);
 }
@@ -266,7 +266,7 @@ static struct mousevsc_dev *release_input_device(struct hv_device *device)
 {
 	struct mousevsc_dev *input_dev;
 
-	input_dev = (struct mousevsc_dev *)device->ext;
+	input_dev = hv_get_drvdata(device);
 
 	/* Busy wait until the ref drop to 2, then set it to 1  */
 	while (atomic_cmpxchg(&input_dev->ref_count, 2, 1) != 2)
@@ -282,13 +282,13 @@ static struct mousevsc_dev *final_release_input_device(struct hv_device *device)
 {
 	struct mousevsc_dev *input_dev;
 
-	input_dev = (struct mousevsc_dev *)device->ext;
+	input_dev = hv_get_drvdata(device);
 
 	/* Busy wait until the ref drop to 1, then set it to 0  */
 	while (atomic_cmpxchg(&input_dev->ref_count, 1, 0) != 1)
 		udelay(100);
 
-	device->ext = NULL;
+	hv_set_drvdata(device, NULL);
 	return input_dev;
 }
 
@@ -790,7 +790,7 @@ static int mousevsc_on_device_remove(struct hv_device *device)
 	int ret = 0;
 
 	pr_info("disabling input device (%p)...",
-		    device->ext);
+		    hv_get_drvdata(device));
 
 	input_dev = release_input_device(device);
 
@@ -808,7 +808,7 @@ static int mousevsc_on_device_remove(struct hv_device *device)
 		udelay(100);
 	}
 
-	pr_info("removing input device (%p)...", device->ext);
+	pr_info("removing input device (%p)...", hv_get_drvdata(device));
 
 	input_dev = final_release_input_device(device);
 
-- 
1.7.4.1

[PATCH 15/20] Staging: hv: vmbus: Get rid of the ext field in struct hv_device

[K. Y. Srinivasan]

Now that we have eliminated all uses of the ext field in struct hv_device,
get rid of the ext field.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/hyperv.h |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/hv/hyperv.h b/drivers/staging/hv/hyperv.h
index e51341f..4b692ea 100644
--- a/drivers/staging/hv/hyperv.h
+++ b/drivers/staging/hv/hyperv.h
@@ -822,9 +822,6 @@ struct hv_device {
 	struct device device;
 
 	struct vmbus_channel *channel;
-
-	/* Device extension; */
-	void *ext;
 };
 
 
-- 
1.7.4.1

[PATCH 16/20] Staging: hv: vmbus: Do not allocate struct hv_device_info on the stack

[K. Y. Srinivasan]

struct hv_device_info is about 101 bytes in size. Do not allocate this structure
on the stack.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/vmbus_drv.c |  134 ++++++++++++++++++++-------------------
 1 files changed, 69 insertions(+), 65 deletions(-)

diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c
index 466425a..d2562af 100644
--- a/drivers/staging/hv/vmbus_drv.c
+++ b/drivers/staging/hv/vmbus_drv.c
@@ -112,101 +112,105 @@ static ssize_t vmbus_show_device_attr(struct device *dev,
 				      char *buf)
 {
 	struct hv_device *hv_dev = device_to_hv_device(dev);
-	struct hv_device_info device_info;
+	struct hv_device_info *device_info;
 	char alias_name[VMBUS_ALIAS_LEN + 1];
+	int ret = 0;
 
-	memset(&device_info, 0, sizeof(struct hv_device_info));
+	device_info = kzalloc(sizeof(struct hv_device_info), GFP_KERNEL);
+	if (!device_info)
+		return ret;
 
-	get_channel_info(hv_dev, &device_info);
+	get_channel_info(hv_dev, device_info);
 
 	if (!strcmp(dev_attr->attr.name, "class_id")) {
-		return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
+		ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 			       "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
-			       device_info.chn_type.b[3],
-			       device_info.chn_type.b[2],
-			       device_info.chn_type.b[1],
-			       device_info.chn_type.b[0],
-			       device_info.chn_type.b[5],
-			       device_info.chn_type.b[4],
-			       device_info.chn_type.b[7],
-			       device_info.chn_type.b[6],
-			       device_info.chn_type.b[8],
-			       device_info.chn_type.b[9],
-			       device_info.chn_type.b[10],
-			       device_info.chn_type.b[11],
-			       device_info.chn_type.b[12],
-			       device_info.chn_type.b[13],
-			       device_info.chn_type.b[14],
-			       device_info.chn_type.b[15]);
+			       device_info->chn_type.b[3],
+			       device_info->chn_type.b[2],
+			       device_info->chn_type.b[1],
+			       device_info->chn_type.b[0],
+			       device_info->chn_type.b[5],
+			       device_info->chn_type.b[4],
+			       device_info->chn_type.b[7],
+			       device_info->chn_type.b[6],
+			       device_info->chn_type.b[8],
+			       device_info->chn_type.b[9],
+			       device_info->chn_type.b[10],
+			       device_info->chn_type.b[11],
+			       device_info->chn_type.b[12],
+			       device_info->chn_type.b[13],
+			       device_info->chn_type.b[14],
+			       device_info->chn_type.b[15]);
 	} else if (!strcmp(dev_attr->attr.name, "device_id")) {
-		return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
+		ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 			       "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
-			       device_info.chn_instance.b[3],
-			       device_info.chn_instance.b[2],
-			       device_info.chn_instance.b[1],
-			       device_info.chn_instance.b[0],
-			       device_info.chn_instance.b[5],
-			       device_info.chn_instance.b[4],
-			       device_info.chn_instance.b[7],
-			       device_info.chn_instance.b[6],
-			       device_info.chn_instance.b[8],
-			       device_info.chn_instance.b[9],
-			       device_info.chn_instance.b[10],
-			       device_info.chn_instance.b[11],
-			       device_info.chn_instance.b[12],
-			       device_info.chn_instance.b[13],
-			       device_info.chn_instance.b[14],
-			       device_info.chn_instance.b[15]);
+			       device_info->chn_instance.b[3],
+			       device_info->chn_instance.b[2],
+			       device_info->chn_instance.b[1],
+			       device_info->chn_instance.b[0],
+			       device_info->chn_instance.b[5],
+			       device_info->chn_instance.b[4],
+			       device_info->chn_instance.b[7],
+			       device_info->chn_instance.b[6],
+			       device_info->chn_instance.b[8],
+			       device_info->chn_instance.b[9],
+			       device_info->chn_instance.b[10],
+			       device_info->chn_instance.b[11],
+			       device_info->chn_instance.b[12],
+			       device_info->chn_instance.b[13],
+			       device_info->chn_instance.b[14],
+			       device_info->chn_instance.b[15]);
 	} else if (!strcmp(dev_attr->attr.name, "modalias")) {
 		print_alias_name(hv_dev, alias_name);
-		return sprintf(buf, "vmbus:%s\n", alias_name);
+		ret = sprintf(buf, "vmbus:%s\n", alias_name);
 	} else if (!strcmp(dev_attr->attr.name, "state")) {
-		return sprintf(buf, "%d\n", device_info.chn_state);
+		ret = sprintf(buf, "%d\n", device_info->chn_state);
 	} else if (!strcmp(dev_attr->attr.name, "id")) {
-		return sprintf(buf, "%d\n", device_info.chn_id);
+		ret = sprintf(buf, "%d\n", device_info->chn_id);
 	} else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
-		return sprintf(buf, "%d\n", device_info.outbound.int_mask);
+		ret = sprintf(buf, "%d\n", device_info->outbound.int_mask);
 	} else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
-		return sprintf(buf, "%d\n", device_info.outbound.read_idx);
+		ret = sprintf(buf, "%d\n", device_info->outbound.read_idx);
 	} else if (!strcmp(dev_attr->attr.name, "out_write_index")) {
-		return sprintf(buf, "%d\n", device_info.outbound.write_idx);
+		ret = sprintf(buf, "%d\n", device_info->outbound.write_idx);
 	} else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) {
-		return sprintf(buf, "%d\n",
-			       device_info.outbound.bytes_avail_toread);
+		ret = sprintf(buf, "%d\n",
+			       device_info->outbound.bytes_avail_toread);
 	} else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) {
-		return sprintf(buf, "%d\n",
-			       device_info.outbound.bytes_avail_towrite);
+		ret = sprintf(buf, "%d\n",
+			       device_info->outbound.bytes_avail_towrite);
 	} else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) {
-		return sprintf(buf, "%d\n", device_info.inbound.int_mask);
+		ret = sprintf(buf, "%d\n", device_info->inbound.int_mask);
 	} else if (!strcmp(dev_attr->attr.name, "in_read_index")) {
-		return sprintf(buf, "%d\n", device_info.inbound.read_idx);
+		ret = sprintf(buf, "%d\n", device_info->inbound.read_idx);
 	} else if (!strcmp(dev_attr->attr.name, "in_write_index")) {
-		return sprintf(buf, "%d\n", device_info.inbound.write_idx);
+		ret = sprintf(buf, "%d\n", device_info->inbound.write_idx);
 	} else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) {
-		return sprintf(buf, "%d\n",
-			       device_info.inbound.bytes_avail_toread);
+		ret = sprintf(buf, "%d\n",
+			       device_info->inbound.bytes_avail_toread);
 	} else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
-		return sprintf(buf, "%d\n",
-			       device_info.inbound.bytes_avail_towrite);
+		ret = sprintf(buf, "%d\n",
+			       device_info->inbound.bytes_avail_towrite);
 	} else if (!strcmp(dev_attr->attr.name, "monitor_id")) {
-		return sprintf(buf, "%d\n", device_info.monitor_id);
+		ret = sprintf(buf, "%d\n", device_info->monitor_id);
 	} else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) {
-		return sprintf(buf, "%d\n", device_info.server_monitor_pending);
+		ret = sprintf(buf, "%d\n", device_info->server_monitor_pending);
 	} else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
-		return sprintf(buf, "%d\n", device_info.server_monitor_latency);
+		ret = sprintf(buf, "%d\n", device_info->server_monitor_latency);
 	} else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
-		return sprintf(buf, "%d\n",
-			       device_info.server_monitor_conn_id);
+		ret = sprintf(buf, "%d\n",
+			       device_info->server_monitor_conn_id);
 	} else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) {
-		return sprintf(buf, "%d\n", device_info.client_monitor_pending);
+		ret = sprintf(buf, "%d\n", device_info->client_monitor_pending);
 	} else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
-		return sprintf(buf, "%d\n", device_info.client_monitor_latency);
+		ret = sprintf(buf, "%d\n", device_info->client_monitor_latency);
 	} else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
-		return sprintf(buf, "%d\n",
-			       device_info.client_monitor_conn_id);
-	} else {
-		return 0;
+		ret = sprintf(buf, "%d\n",
+			       device_info->client_monitor_conn_id);
 	}
+
+	kfree(device_info);
+	return ret;
 }
 
 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
-- 
1.7.4.1

[PATCH 17/20] Staging: hv: vmbus: Get rid of the module dependency

[K. Y. Srinivasan]

Hyper-V modules can be built as part of the kernel (not just as modules).
Get rid of the module dependency in Kconfig.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/Kconfig |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/hv/Kconfig b/drivers/staging/hv/Kconfig
index 26b5064..815f8c2 100644
--- a/drivers/staging/hv/Kconfig
+++ b/drivers/staging/hv/Kconfig
@@ -1,6 +1,6 @@
 config HYPERV
 	tristate "Microsoft Hyper-V client drivers"
-	depends on X86 && ACPI && PCI && m
+	depends on X86 && ACPI && PCI
 	default n
 	help
 	  Select this option to run Linux as a Hyper-V client operating
-- 
1.7.4.1

[PATCH 18/20] Staging: hv: netvsc: Rename netDevice as net_device

[K. Y. Srinivasan]

Rename netDevice as net_device.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/netvsc.c       |    5 ++++-
 drivers/staging/hv/rndis_filter.c |   14 +++++++-------
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/hv/netvsc.c b/drivers/staging/hv/netvsc.c
index 2bcc8b2..b902579 100644
--- a/drivers/staging/hv/netvsc.c
+++ b/drivers/staging/hv/netvsc.c
@@ -382,7 +382,10 @@ int netvsc_device_remove(struct hv_device *device)
 	hv_set_drvdata(device, NULL);
 	spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
 
-	/* At this point, no one should be accessing netDevice except in here */
+	/*
+	 * At this point, no one should be accessing net_device
+	 * except in here
+	 */
 	dev_notice(&device->device, "net device safe to remove\n");
 
 	/* Now, we can close the channel safely */
diff --git a/drivers/staging/hv/rndis_filter.c b/drivers/staging/hv/rndis_filter.c
index b354b0b..efa7df5 100644
--- a/drivers/staging/hv/rndis_filter.c
+++ b/drivers/staging/hv/rndis_filter.c
@@ -689,7 +689,7 @@ int rndis_filter_device_add(struct hv_device *dev,
 				  void *additional_info)
 {
 	int ret;
-	struct netvsc_device *netDevice;
+	struct netvsc_device *net_device;
 	struct rndis_device *rndisDevice;
 	struct netvsc_device_info *deviceInfo = additional_info;
 
@@ -710,10 +710,10 @@ int rndis_filter_device_add(struct hv_device *dev,
 
 
 	/* Initialize the rndis device */
-	netDevice = hv_get_drvdata(dev);
+	net_device = hv_get_drvdata(dev);
 
-	netDevice->extension = rndisDevice;
-	rndisDevice->net_dev = netDevice;
+	net_device->extension = rndisDevice;
+	rndisDevice->net_dev = net_device;
 
 	/* Send the rndis initialization message */
 	ret = rndis_filter_init_device(rndisDevice);
@@ -762,12 +762,12 @@ void rndis_filter_device_remove(struct hv_device *dev)
 
 int rndis_filter_open(struct hv_device *dev)
 {
-	struct netvsc_device *netDevice = hv_get_drvdata(dev);
+	struct netvsc_device *net_device = hv_get_drvdata(dev);
 
-	if (!netDevice)
+	if (!net_device)
 		return -EINVAL;
 
-	return rndis_filter_open_device(netDevice->extension);
+	return rndis_filter_open_device(net_device->extension);
 }
 
 int rndis_filter_close(struct hv_device *dev)
-- 
1.7.4.1

[PATCH 19/20] Staging: hv: netvsc: Rename rndisDevice to rndis_device

[K. Y. Srinivasan]

Rename rndisDevice to rndis_device.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/rndis_filter.c |   24 ++++++++++++------------
 1 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/staging/hv/rndis_filter.c b/drivers/staging/hv/rndis_filter.c
index efa7df5..bfe9129 100644
--- a/drivers/staging/hv/rndis_filter.c
+++ b/drivers/staging/hv/rndis_filter.c
@@ -690,11 +690,11 @@ int rndis_filter_device_add(struct hv_device *dev,
 {
 	int ret;
 	struct netvsc_device *net_device;
-	struct rndis_device *rndisDevice;
+	struct rndis_device *rndis_device;
 	struct netvsc_device_info *deviceInfo = additional_info;
 
-	rndisDevice = get_rndis_device();
-	if (!rndisDevice)
+	rndis_device = get_rndis_device();
+	if (!rndis_device)
 		return -ENODEV;
 
 	/*
@@ -704,7 +704,7 @@ int rndis_filter_device_add(struct hv_device *dev,
 	 */
 	ret = netvsc_device_add(dev, additional_info);
 	if (ret != 0) {
-		kfree(rndisDevice);
+		kfree(rndis_device);
 		return ret;
 	}
 
@@ -712,11 +712,11 @@ int rndis_filter_device_add(struct hv_device *dev,
 	/* Initialize the rndis device */
 	net_device = hv_get_drvdata(dev);
 
-	net_device->extension = rndisDevice;
-	rndisDevice->net_dev = net_device;
+	net_device->extension = rndis_device;
+	rndis_device->net_dev = net_device;
 
 	/* Send the rndis initialization message */
-	ret = rndis_filter_init_device(rndisDevice);
+	ret = rndis_filter_init_device(rndis_device);
 	if (ret != 0) {
 		/*
 		 * TODO: If rndis init failed, we will need to shut down the
@@ -725,21 +725,21 @@ int rndis_filter_device_add(struct hv_device *dev,
 	}
 
 	/* Get the mac address */
-	ret = rndis_filter_query_device_mac(rndisDevice);
+	ret = rndis_filter_query_device_mac(rndis_device);
 	if (ret != 0) {
 		/*
 		 * TODO: shutdown rndis device and the channel
 		 */
 	}
 
-	memcpy(deviceInfo->mac_adr, rndisDevice->hw_mac_adr, ETH_ALEN);
+	memcpy(deviceInfo->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
 
-	rndis_filter_query_device_link_status(rndisDevice);
+	rndis_filter_query_device_link_status(rndis_device);
 
-	deviceInfo->link_state = rndisDevice->link_stat;
+	deviceInfo->link_state = rndis_device->link_stat;
 
 	dev_info(&dev->device, "Device MAC %pM link state %s",
-		 rndisDevice->hw_mac_adr,
+		 rndis_device->hw_mac_adr,
 		 ((deviceInfo->link_state) ? ("down\n") : ("up\n")));
 
 	return ret;
-- 
1.7.4.1

[PATCH 20/20] Staging: hv: netvsc: Rename deviceInfo as device_info

[K. Y. Srinivasan]

Rename deviceInfo as device_info.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/rndis_filter.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/hv/rndis_filter.c b/drivers/staging/hv/rndis_filter.c
index bfe9129..963582a 100644
--- a/drivers/staging/hv/rndis_filter.c
+++ b/drivers/staging/hv/rndis_filter.c
@@ -691,7 +691,7 @@ int rndis_filter_device_add(struct hv_device *dev,
 	int ret;
 	struct netvsc_device *net_device;
 	struct rndis_device *rndis_device;
-	struct netvsc_device_info *deviceInfo = additional_info;
+	struct netvsc_device_info *device_info = additional_info;
 
 	rndis_device = get_rndis_device();
 	if (!rndis_device)
@@ -732,15 +732,15 @@ int rndis_filter_device_add(struct hv_device *dev,
 		 */
 	}
 
-	memcpy(deviceInfo->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
+	memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
 
 	rndis_filter_query_device_link_status(rndis_device);
 
-	deviceInfo->link_state = rndis_device->link_stat;
+	device_info->link_state = rndis_device->link_stat;
 
 	dev_info(&dev->device, "Device MAC %pM link state %s",
 		 rndis_device->hw_mac_adr,
-		 ((deviceInfo->link_state) ? ("down\n") : ("up\n")));
+		 ((device_info->link_state) ? ("down\n") : ("up\n")));
 
 	return ret;
 }
-- 
1.7.4.1

Re: [PATCH 20/20] Staging: hv: netvsc: Rename deviceInfo as device_info

[Joe Perches]

On Tue, 2011-09-13 at 10:59 -0700, K. Y. Srinivasan wrote:
> Rename deviceInfo as device_info.
[]
> diff --git a/drivers/staging/hv/rndis_filter.c b/drivers/staging/hv/rndis_filter.c
[]
> @@ -732,15 +732,15 @@ int rndis_filter_device_add(struct hv_device *dev,
[]
>  	dev_info(&dev->device, "Device MAC %pM link state %s",
>  		 rndis_device->hw_mac_adr,
> -		 ((deviceInfo->link_state) ? ("down\n") : ("up\n")));
> +		 ((device_info->link_state) ? ("down\n") : ("up\n")));

Maybe get rid of the superfluous parentheses too?

	dev_info(&dev->device, "Device MAC %pM link state %s\n",
		 rndis_device->hw_mac_adr,
		 device_info->link_state ? "down" : "up");

Also, struct rndis_device uses
	u32 link_stat;
that is copied into struct netvsc_device_info
	bool link_state;
could you please rationalize the names and types
of those 2 variables?

RE: [PATCH 20/20] Staging: hv: netvsc: Rename deviceInfo as device_info

[KY Srinivasan]

> -----Original Message-----
> From: Joe Perches [mailto:joe@perches.com]
> Sent: Tuesday, September 13, 2011 2:11 PM
> To: KY Srinivasan
> Cc: gregkh@suse.de; linux-kernel@vger.kernel.org;
> devel@linuxdriverproject.org; virtualization@lists.osdl.org; Haiyang Zhang
> Subject: Re: [PATCH 20/20] Staging: hv: netvsc: Rename deviceInfo as
> device_info
> 
> On Tue, 2011-09-13 at 10:59 -0700, K. Y. Srinivasan wrote:
> > Rename deviceInfo as device_info.
> []
> > diff --git a/drivers/staging/hv/rndis_filter.c b/drivers/staging/hv/rndis_filter.c
> []
> > @@ -732,15 +732,15 @@ int rndis_filter_device_add(struct hv_device *dev,
> []
> >  	dev_info(&dev->device, "Device MAC %pM link state %s",
> >  		 rndis_device->hw_mac_adr,
> > -		 ((deviceInfo->link_state) ? ("down\n") : ("up\n")));
> > +		 ((device_info->link_state) ? ("down\n") : ("up\n")));
> 
> Maybe get rid of the superfluous parentheses too?
> 
> 	dev_info(&dev->device, "Device MAC %pM link state %s\n",
> 		 rndis_device->hw_mac_adr,
> 		 device_info->link_state ? "down" : "up");
> 
> Also, struct rndis_device uses
> 	u32 link_stat;
> that is copied into struct netvsc_device_info
> 	bool link_state;
> could you please rationalize the names and types
> of those 2 variables?

Thanks Joe; I will get a patch out soon.

Regards,

K. Y

Re: [PATCH 09/20] Staging: hv: storvsc: Get rid of storvsc_dev_add() by inlining the code

[Christoph Hellwig]

On Tue, Sep 13, 2011 at 10:59:45AM -0700, K. Y. Srinivasan wrote:
> Get rid of storvsc_dev_add() by inlining the code.

This also means struct storvsc_device_info can go away, doesn't it?

Re: [PATCH 16/20] Staging: hv: vmbus: Do not allocate struct hv_device_info on the stack

[Christoph Hellwig]

On Tue, Sep 13, 2011 at 10:59:52AM -0700, K. Y. Srinivasan wrote:
> struct hv_device_info is about 101 bytes in size. Do not allocate this structure
> on the stack.

The correct fix is to kill that structure entirely but implementing
each attribute separately.

RE: [PATCH 09/20] Staging: hv: storvsc: Get rid of storvsc_dev_add() by inlining the code

[KY Srinivasan]

> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@infradead.org]
> Sent: Tuesday, September 13, 2011 2:40 PM
> To: KY Srinivasan
> Cc: gregkh@suse.de; linux-kernel@vger.kernel.org;
> devel@linuxdriverproject.org; virtualization@lists.osdl.org; Haiyang Zhang
> Subject: Re: [PATCH 09/20] Staging: hv: storvsc: Get rid of storvsc_dev_add() by
> inlining the code
> 
> On Tue, Sep 13, 2011 at 10:59:45AM -0700, K. Y. Srinivasan wrote:
> > Get rid of storvsc_dev_add() by inlining the code.
> 
> This also means struct storvsc_device_info can go away, doesn't it?
> 
Yes;  PATCH 11/20 gets rid of struct storvsc_device_info definition and other unneeded state.

Regards,

K. Y

Re: [PATCH 06/20] Staging: hv: util: Properly handle util services in the util driver

[Dan Carpenter]

On Tue, Sep 13, 2011 at 10:59:42AM -0700, K. Y. Srinivasan wrote:
> @@ -403,31 +384,13 @@ static void vmbus_process_offer(struct work_struct *work)
>  		spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
>  
>  		free_channel(newchannel);
> -	} else {
> +	} else
>  		/*
>  		 * This state is used to indicate a successful open
>  		 * so that when we do close the channel normally, we
>  		 * can cleanup properly
>  		 */
>  		newchannel->state = CHANNEL_OPEN_STATE;

It's not worth resending, but this should have kept the curly braces
for two style reasons.
1) If one side of the if else pair has braces the other side gets
braces too.
2) If it's more than one line, it gets braces even if it's not needed
for semantic reasons.

Sorry to email you these pedantic things, but if I don't then my OCD 
acts up and I feel all itchy for hours.  Also you have a similar
thing below as well.

regards,
dan carpenter

RE: [PATCH 06/20] Staging: hv: util: Properly handle util services in the util driver

[KY Srinivasan]

> -----Original Message-----
> From: Dan Carpenter [mailto:error27@gmail.com]
> Sent: Thursday, September 15, 2011 4:09 PM
> To: KY Srinivasan
> Cc: gregkh@suse.de; linux-kernel@vger.kernel.org;
> devel@linuxdriverproject.org; virtualization@lists.osdl.org; Haiyang Zhang
> Subject: Re: [PATCH 06/20] Staging: hv: util: Properly handle util services in the
> util driver
> 
> On Tue, Sep 13, 2011 at 10:59:42AM -0700, K. Y. Srinivasan wrote:
> > @@ -403,31 +384,13 @@ static void vmbus_process_offer(struct work_struct
> *work)
> >  		spin_unlock_irqrestore(&vmbus_connection.channel_lock,
> flags);
> >
> >  		free_channel(newchannel);
> > -	} else {
> > +	} else
> >  		/*
> >  		 * This state is used to indicate a successful open
> >  		 * so that when we do close the channel normally, we
> >  		 * can cleanup properly
> >  		 */
> >  		newchannel->state = CHANNEL_OPEN_STATE;
> 
> It's not worth resending, but this should have kept the curly braces
> for two style reasons.
> 1) If one side of the if else pair has braces the other side gets
> braces too.
> 2) If it's more than one line, it gets braces even if it's not needed
> for semantic reasons.
> 
> Sorry to email you these pedantic things, but if I don't then my OCD
> acts up and I feel all itchy for hours.  Also you have a similar
> thing below as well.

Thanks Dan. I will wait for Greg's action here. Given that Kernel.org is still
down, we are all kind of flying in the dark here.

Regards,

K. Y

Re: [PATCH 05/20] Staging: hv: util: Perform some service specific init/deinit in probe/remove

[Greg KH]

On Tue, Sep 13, 2011 at 10:59:41AM -0700, K. Y. Srinivasan wrote:
> --- a/drivers/staging/hv/hv_util.c
> +++ b/drivers/staging/hv/hv_util.c
> @@ -30,9 +30,31 @@
>  #include "hyperv.h"
>  #include "hv_kvp.h"
>  
> -static u8 *shut_txf_buf;
> -static u8 *time_txf_buf;
> -static u8 *hbeat_txf_buf;
> +
> +static void shutdown_onchannelcallback(void *context);
> +static struct hv_util_service util_shutdown = {
> +	.service_name = "Shutdown channel functionality initialized\n",

That's not a name, it's a text string to send to userspace, and it's
really redundant given the other times you use this.

Please just put the name here, if you really need it (hint, you really
don't, so just drop it please.)

greg k-h

Re: [PATCH 06/20] Staging: hv: util: Properly handle util services in the util driver

[Greg KH]

On Tue, Sep 13, 2011 at 10:59:42AM -0700, K. Y. Srinivasan wrote:
>  static int __init init_hyperv_utils(void)
>  {
> -	int ret;
>  	pr_info("Registering HyperV Utility Driver\n");

All of these "registering" and "unregistering" messages should be
removed, they do nothing but clutter up the logs and are pointless.  You
can find this information out any time you want by looking in sysfs
instead of trying to parse random strings out of the kernel log.

greg k-h

Re: [PATCH 0000/0020] Staging: hv: Driver cleanup

[Greg KH]

On Tue, Sep 13, 2011 at 10:59:19AM -0700, K. Y. Srinivasan wrote:
> Address Greg's VmBus audit comments:
> 
> 	1) Leverage driver_data field in struct hv_vmbus_device_id to
> 	   simplify driver code.
> 
> 	2) Make the util driver conform to the Linux Driver Model.
> 
> 	3) Get rid of the ext field in struct hv_device by using the
> 	   driver specific data functionality.
> 
> 	4) Implement vmbus specific wrapper functions for setting and getting
> 	   driver specific data..
> 
> 	5) Other general cleanup.

I applied 17 of these (i.e. the ones I didn't comment on.)

greg k-h

RE: [PATCH 06/20] Staging: hv: util: Properly handle util services in the util driver

[KY Srinivasan]

> -----Original Message-----
> From: Greg KH [mailto:greg@kroah.com]
> Sent: Friday, September 16, 2011 2:03 PM
> To: KY Srinivasan
> Cc: gregkh@suse.de; linux-kernel@vger.kernel.org;
> devel@linuxdriverproject.org; virtualization@lists.osdl.org; Haiyang Zhang
> Subject: Re: [PATCH 06/20] Staging: hv: util: Properly handle util services in the
> util driver
> 
> On Tue, Sep 13, 2011 at 10:59:42AM -0700, K. Y. Srinivasan wrote:
> >  static int __init init_hyperv_utils(void)
> >  {
> > -	int ret;
> >  	pr_info("Registering HyperV Utility Driver\n");
> 
> All of these "registering" and "unregistering" messages should be
> removed, they do nothing but clutter up the logs and are pointless.  You
> can find this information out any time you want by looking in sysfs
> instead of trying to parse random strings out of the kernel log.

I was just trying to preserve the messages that were being put out
In the existing code. I will get rid of these messages and send you updated
patches.

Regards,

K. Y

RE: [PATCH 0000/0020] Staging: hv: Driver cleanup

[KY Srinivasan]

> -----Original Message-----
> From: Greg KH [mailto:greg@kroah.com]
> Sent: Friday, September 16, 2011 2:07 PM
> To: KY Srinivasan
> Cc: gregkh@suse.de; linux-kernel@vger.kernel.org;
> devel@linuxdriverproject.org; virtualization@lists.osdl.org
> Subject: Re: [PATCH 0000/0020] Staging: hv: Driver cleanup
> 
> On Tue, Sep 13, 2011 at 10:59:19AM -0700, K. Y. Srinivasan wrote:
> > Address Greg's VmBus audit comments:
> >
> > 	1) Leverage driver_data field in struct hv_vmbus_device_id to
> > 	   simplify driver code.
> >
> > 	2) Make the util driver conform to the Linux Driver Model.
> >
> > 	3) Get rid of the ext field in struct hv_device by using the
> > 	   driver specific data functionality.
> >
> > 	4) Implement vmbus specific wrapper functions for setting and getting
> > 	   driver specific data..
> >
> > 	5) Other general cleanup.
> 
> I applied 17 of these (i.e. the ones I didn't comment on.)

Thanks Greg. Looking at your comments, it looks like the only
issue in the 3 patches not checked in is related to unnecessary
messages being put out. I will get the fixed patches out soon.

Regards,

K. Y

> 
> greg k-h