[PATCH 113/206] Staging: hv: Use completion abstraction to synchronize in vmbus_channel_msginfo

K. Y. Srinivasan
2011-05-09T21:47:57Z

Use completion abstraction to synchronize in vmbus_channel_msginfo.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
drivers/staging/hv/channel.c | 31 ++++++++++++-------------------
drivers/staging/hv/channel_mgmt.c | 31 ++++++++++++++-----------------
drivers/staging/hv/channel_mgmt.h | 4 ++--
drivers/staging/hv/connection.c | 9 ++++-----
4 files changed, 32 insertions(+), 43 deletions(-)

diff --git a/drivers/staging/hv/channel.c b/drivers/staging/hv/channel.c
index 5fcf9d3..1b50cb7 100644
--- a/drivers/staging/hv/channel.c
+++ b/drivers/staging/hv/channel.c
@@ -177,7 +177,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
struct vmbus_channel_msginfo *openInfo = NULL;
void *in, *out;
unsigned long flags;
- int ret, err = 0;
+ int ret, t, err = 0;

/* Aligned to page size */
/* ASSERT(!(SendRingBufferSize & (PAGE_SIZE - 1))); */
@@ -240,7 +240,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
goto errorout;
}

- init_waitqueue_head(&openInfo->waitevent);
+ init_completion(&openInfo->waitevent);

openMsg = (struct vmbus_channel_open_channel *)openInfo->msg;
openMsg->header.msgtype = CHANNELMSG_OPENCHANNEL;
@@ -270,11 +270,8 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
if (ret != 0)
goto Cleanup;

- openInfo->wait_condition = 0;
- wait_event_timeout(openInfo->waitevent,
- openInfo->wait_condition,
- msecs_to_jiffies(1000));
- if (openInfo->wait_condition == 0) {
+ t = wait_for_completion_timeout(&openInfo->waitevent, HZ);
+ if (t == 0) {
err = -ETIMEDOUT;
goto errorout;
}
@@ -495,6 +492,7 @@ int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
u32 next_gpadl_handle;
unsigned long flags;
int ret = 0;
+ int t;

next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle);
atomic_inc(&vmbus_connection.next_gpadl_handle);
@@ -503,7 +501,7 @@ int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
if (ret)
return ret;

- init_waitqueue_head(&msginfo->waitevent);
+ init_completion(&msginfo->waitevent);

gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg;
gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER;
@@ -518,7 +516,6 @@ int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,

spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);

- msginfo->wait_condition = 0;
ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize -
sizeof(*msginfo));
if (ret != 0)
@@ -546,10 +543,8 @@ int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,

}
}
- wait_event_timeout(msginfo->waitevent,
- msginfo->wait_condition,
- msecs_to_jiffies(1000));
- BUG_ON(msginfo->wait_condition == 0);
+ t = wait_for_completion_timeout(&msginfo->waitevent, HZ);
+ BUG_ON(t == 0);

/* At this point, we received the gpadl created msg */
@@ -573,7 +568,7 @@ int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
struct vmbus_channel_gpadl_teardown *msg;
struct vmbus_channel_msginfo *info;
unsigned long flags;
- int ret;
+ int ret, t;

/* ASSERT(gpadl_handle != 0); */

@@ -582,7 +577,7 @@ int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
if (!info)
return -ENOMEM;

- init_waitqueue_head(&info->waitevent);
+ init_completion(&info->waitevent);

msg = (struct vmbus_channel_gpadl_teardown *)info->msg;

@@ -594,14 +589,12 @@ int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
list_add_tail(&info->msglistentry,
&vmbus_connection.chn_msg_list);
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
- info->wait_condition = 0;
ret = vmbus_post_msg(msg,
sizeof(struct vmbus_channel_gpadl_teardown));

BUG_ON(ret != 0);
- wait_event_timeout(info->waitevent,
- info->wait_condition, msecs_to_jiffies(1000));
- BUG_ON(info->wait_condition == 0);
+ t = wait_for_completion_timeout(&info->waitevent, HZ);
+ BUG_ON(t == 0);

/* Received a torndown response */
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
diff --git a/drivers/staging/hv/channel_mgmt.c b/drivers/staging/hv/channel_mgmt.c
index 95eef92..33cb5d5 100644
--- a/drivers/staging/hv/channel_mgmt.c
+++ b/drivers/staging/hv/channel_mgmt.c
@@ -556,9 +556,9 @@ static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
openmsg->openid == result->openid) {
memcpy(&msginfo->response.open_result,
result,
- sizeof(struct vmbus_channel_open_result));
- msginfo->wait_condition = 1;
- wake_up(&msginfo->waitevent);
+ sizeof(
+ struct vmbus_channel_open_result));
+ complete(&msginfo->waitevent);
break;
}
}
@@ -603,9 +603,9 @@ static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
(gpadlcreated->gpadl == gpadlheader->gpadl)) {
memcpy(&msginfo->response.gpadl_created,
gpadlcreated,
- sizeof(struct vmbus_channel_gpadl_created));
- msginfo->wait_condition = 1;
- wake_up(&msginfo->waitevent);
+ sizeof(
+ struct vmbus_channel_gpadl_created));
+ complete(&msginfo->waitevent);
break;
}
}
@@ -648,9 +648,9 @@ static void vmbus_ongpadl_torndown(
if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
memcpy(&msginfo->response.gpadl_torndown,
gpadl_torndown,
- sizeof(struct vmbus_channel_gpadl_torndown));
- msginfo->wait_condition = 1;
- wake_up(&msginfo->waitevent);
+ sizeof(
+ struct vmbus_channel_gpadl_torndown));
+ complete(&msginfo->waitevent);
break;
}
}
@@ -689,8 +689,7 @@ static void vmbus_onversion_response(
memcpy(&msginfo->response.version_response,
version_response,
sizeof(struct vmbus_channel_version_response));
- msginfo->wait_condition = 1;
- wake_up(&msginfo->waitevent);
+ complete(&msginfo->waitevent);
}
}
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
@@ -753,7 +752,7 @@ int vmbus_request_offers(void)
{
struct vmbus_channel_message_header *msg;
struct vmbus_channel_msginfo *msginfo;
- int ret;
+ int ret, t;

msginfo = kmalloc(sizeof(*msginfo) +
sizeof(struct vmbus_channel_message_header),
@@ -761,7 +760,7 @@ int vmbus_request_offers(void)
if (!msginfo)
return -ENOMEM;

- init_waitqueue_head(&msginfo->waitevent);
+ init_completion(&msginfo->waitevent);

msg = (struct vmbus_channel_message_header *)msginfo->msg;

@@ -776,10 +775,8 @@ int vmbus_request_offers(void)
goto cleanup;
}

- msginfo->wait_condition = 0;
- wait_event_timeout(msginfo->waitevent, msginfo->wait_condition,
- msecs_to_jiffies(1000));
- if (msginfo->wait_condition == 0) {
+ t = wait_for_completion_timeout(&msginfo->waitevent, HZ);
+ if (t == 0) {
ret = -ETIMEDOUT;
goto cleanup;
}
diff --git a/drivers/staging/hv/channel_mgmt.h b/drivers/staging/hv/channel_mgmt.h
index 3b2c393..f895d0a 100644
--- a/drivers/staging/hv/channel_mgmt.h
+++ b/drivers/staging/hv/channel_mgmt.h
@@ -28,6 +28,7 @@
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
+#include <linux/completion.h>
#include "ring_buffer.h"
#include "vmbus_channel_interface.h"
#include "vmbus_packet_format.h"
@@ -290,8 +291,7 @@ struct vmbus_channel_msginfo {
struct list_head submsglist;

/* Synchronize the request/response if needed */
- int wait_condition;
- wait_queue_head_t waitevent;
+ struct completion waitevent;
union {
struct vmbus_channel_version_supported version_supported;
struct vmbus_channel_open_result open_result;
diff --git a/drivers/staging/hv/connection.c b/drivers/staging/hv/connection.c
index 4f411a9..92add38 100644
--- a/drivers/staging/hv/connection.c
+++ b/drivers/staging/hv/connection.c
@@ -44,6 +44,7 @@ struct vmbus_connection vmbus_connection = {
int vmbus_connect(void)
{
int ret = 0;
+ int t;
struct vmbus_channel_msginfo *msginfo = NULL;
struct vmbus_channel_initiate_contact *msg;
unsigned long flags;
@@ -101,7 +102,7 @@ int vmbus_connect(void)
goto Cleanup;
}

- init_waitqueue_head(&msginfo->waitevent);
+ init_completion(&msginfo->waitevent);

msg = (struct vmbus_channel_initiate_contact *)msginfo->msg;

@@ -134,10 +135,8 @@ int vmbus_connect(void)
}

/* Wait for the connection response */
- msginfo->wait_condition = 0;
- wait_event_timeout(msginfo->waitevent, msginfo->wait_condition,
- msecs_to_jiffies(1000));
- if (msginfo->wait_condition == 0) {
+ t = wait_for_completion_timeout(&msginfo->waitevent, HZ);
+ if (t == 0) {
spin_lock_irqsave(&vmbus_connection.channelmsg_lock,
flags);
list_del(&msginfo->msglistentry);
--
1.7.4.1