[PATCH v3 0/5] usbnet: avoiding access auto-suspended device

[PATCH v3 0/5] usbnet: avoiding access auto-suspended device

[Ming Lei]

Hi,

This patchset avoids accessing auto-suspended device in ioctl path,
which is generally triggered by some network utility(ethtool, ifconfig,
...)

Most of network devices have the problem, but as discussed in the
thread:

        http://marc.info/?t=135054860600003&r=1&w=2

the problem should be solved inside driver.

Considered that only smsc75xx and smsc95xx calls usbnet_read_cmd()
and usbnet_write_cmd() inside its resume and suspend callback, the
patcheset introduces the nopm version of the two functions which
should be called only in the resume and suspend callback. So we
can solve the problem by runtime resuming device before doing
control message things.

The patchset is against 3.7.0-rc4-next-20121105, and has been tested
OK on smsc95xx usbnet device.

Change logs:
V3:
	- fix comment and code style reported by Sergei Shtylyov
V2:
        - rebased on the latest net-next tree, only 2/5 changed
V1:
        - rebased on 3.7.0-rc3-next-20121102, only patch 4/5 changed
        - fix one memory leak during smsc95xx_suspend, patch 3/5 added

 drivers/net/usb/smsc75xx.c |  147 +++++++++++++++++++++++++++-----------------
 drivers/net/usb/smsc95xx.c |  146 +++++++++++++++++++++++++++----------------
 drivers/net/usb/usbnet.c   |   74 ++++++++++++++++++++--
 include/linux/usb/usbnet.h |    4 ++
 4 files changed, 257 insertions(+), 114 deletions(-)


Thanks,
--
Ming Lei

[PATCH v3 1/5] usbnet: introduce usbnet_{read|write}_cmd_nopm

[Ming Lei]

This patch introduces the below two helpers to prepare for solving
the usbnet runtime PM problem, which may cause some network utilities
(ifconfig, ethtool,...) touch a suspended device.

	usbnet_read_cmd_nopm()
	usbnet_write_cmd_nopm()

The above two helpers should be called by usbnet resume/suspend
callback to avoid deadlock.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
---
 drivers/net/usb/usbnet.c   |   62 ++++++++++++++++++++++++++++++++++++++++----
 include/linux/usb/usbnet.h |    4 +++
 2 files changed, 61 insertions(+), 5 deletions(-)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 09ea47a..a7fb074 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1614,8 +1614,8 @@ void usbnet_device_suggests_idle(struct usbnet *dev)
 EXPORT_SYMBOL(usbnet_device_suggests_idle);
 
 /*-------------------------------------------------------------------------*/
-int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
-		    u16 value, u16 index, void *data, u16 size)
+static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
+			     u16 value, u16 index, void *data, u16 size)
 {
 	void *buf = NULL;
 	int err = -ENOMEM;
@@ -1639,10 +1639,10 @@ int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
 out:
 	return err;
 }
-EXPORT_SYMBOL_GPL(usbnet_read_cmd);
 
-int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
-		     u16 value, u16 index, const void *data, u16 size)
+static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
+			      u16 value, u16 index, const void *data,
+			      u16 size)
 {
 	void *buf = NULL;
 	int err = -ENOMEM;
@@ -1665,8 +1665,56 @@ int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
 out:
 	return err;
 }
+
+/*
+ * The function can't be called inside suspend/resume callback,
+ * otherwise deadlock will be caused.
+ */
+int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
+		    u16 value, u16 index, void *data, u16 size)
+{
+	return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
+				 data, size);
+}
+EXPORT_SYMBOL_GPL(usbnet_read_cmd);
+
+/*
+ * The function can't be called inside suspend/resume callback,
+ * otherwise deadlock will be caused.
+ */
+int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
+		     u16 value, u16 index, const void *data, u16 size)
+{
+	return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
+				  data, size);
+}
 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
 
+/*
+ * The function can be called inside suspend/resume callback safely
+ * and should only be called by suspend/resume callback generally.
+ */
+int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
+			  u16 value, u16 index, void *data, u16 size)
+{
+	return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
+				 data, size);
+}
+EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
+
+/*
+ * The function can be called inside suspend/resume callback safely
+ * and should only be called by suspend/resume callback generally.
+ */
+int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
+			  u16 value, u16 index, const void *data,
+			  u16 size)
+{
+	return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
+				  data, size);
+}
+EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
+
 static void usbnet_async_cmd_cb(struct urb *urb)
 {
 	struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
@@ -1680,6 +1728,10 @@ static void usbnet_async_cmd_cb(struct urb *urb)
 	usb_free_urb(urb);
 }
 
+/*
+ * The caller must make sure that device can't be put into suspend
+ * state until the control URB completes.
+ */
 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
 			   u16 value, u16 index, const void *data, u16 size)
 {
diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
index 4410e416..9bbeabf 100644
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -167,6 +167,10 @@ extern int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
 		    u16 value, u16 index, void *data, u16 size);
 extern int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
 		    u16 value, u16 index, const void *data, u16 size);
+extern int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
+		    u16 value, u16 index, void *data, u16 size);
+extern int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
+		    u16 value, u16 index, const void *data, u16 size);
 extern int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
 		    u16 value, u16 index, const void *data, u16 size);
 
-- 
1.7.9.5

[PATCH v3 2/5] usbnet: smsc75xx: apply the introduced usbnet_{read|write}_cmd_nopm

[Ming Lei]

This patch applies the introduced usbnet_read_cmd_nopm() and
usbnet_write_cmd_nopm() in the callback of resume and suspend
to avoid deadlock if USB runtime PM is considered into
usbnet_read_cmd() and usbnet_write_cmd().

Cc: Steve Glendinning <steve.glendinning-nksJyM/082jR7s880joybQ@public.gmane.org>
Signed-off-by: Ming Lei <ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
---
 drivers/net/usb/smsc75xx.c |  147 +++++++++++++++++++++++++++-----------------
 1 file changed, 90 insertions(+), 57 deletions(-)

diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index 85d70c2..c5353cf 100644
--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -85,18 +85,23 @@ static bool turbo_mode = true;
 module_param(turbo_mode, bool, 0644);
 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
 
-static int __must_check smsc75xx_read_reg(struct usbnet *dev, u32 index,
-					  u32 *data)
+static int __must_check __smsc75xx_read_reg(struct usbnet *dev, u32 index,
+					    u32 *data, int in_pm)
 {
 	u32 buf;
 	int ret;
+	int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
 
 	BUG_ON(!dev);
 
-	ret = usbnet_read_cmd(dev, USB_VENDOR_REQUEST_READ_REGISTER,
-			      USB_DIR_IN | USB_TYPE_VENDOR |
-			      USB_RECIP_DEVICE,
-			      0, index, &buf, 4);
+	if (!in_pm)
+		fn = usbnet_read_cmd;
+	else
+		fn = usbnet_read_cmd_nopm;
+
+	ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
+		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+		 0, index, &buf, 4);
 	if (unlikely(ret < 0))
 		netdev_warn(dev->net,
 			"Failed to read reg index 0x%08x: %d", index, ret);
@@ -107,21 +112,26 @@ static int __must_check smsc75xx_read_reg(struct usbnet *dev, u32 index,
 	return ret;
 }
 
-static int __must_check smsc75xx_write_reg(struct usbnet *dev, u32 index,
-					   u32 data)
+static int __must_check __smsc75xx_write_reg(struct usbnet *dev, u32 index,
+					     u32 data, int in_pm)
 {
 	u32 buf;
 	int ret;
+	int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 
 	BUG_ON(!dev);
 
+	if (!in_pm)
+		fn = usbnet_write_cmd;
+	else
+		fn = usbnet_write_cmd_nopm;
+
 	buf = data;
 	cpu_to_le32s(&buf);
 
-	ret = usbnet_write_cmd(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
-			       USB_DIR_OUT | USB_TYPE_VENDOR |
-			       USB_RECIP_DEVICE,
-			       0, index, &buf, 4);
+	ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
+		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+		 0, index, &buf, 4);
 	if (unlikely(ret < 0))
 		netdev_warn(dev->net,
 			"Failed to write reg index 0x%08x: %d", index, ret);
@@ -129,16 +139,38 @@ static int __must_check smsc75xx_write_reg(struct usbnet *dev, u32 index,
 	return ret;
 }
 
+static int __must_check smsc75xx_read_reg_nopm(struct usbnet *dev, u32 index,
+					       u32 *data)
+{
+	return __smsc75xx_read_reg(dev, index, data, 1);
+}
+
+static int __must_check smsc75xx_write_reg_nopm(struct usbnet *dev, u32 index,
+						u32 data)
+{
+	return __smsc75xx_write_reg(dev, index, data, 1);
+}
+
+static int __must_check smsc75xx_read_reg(struct usbnet *dev, u32 index,
+					  u32 *data)
+{
+	return __smsc75xx_read_reg(dev, index, data, 0);
+}
+
+static int __must_check smsc75xx_write_reg(struct usbnet *dev, u32 index,
+					   u32 data)
+{
+	return __smsc75xx_write_reg(dev, index, data, 0);
+}
+
 static int smsc75xx_set_feature(struct usbnet *dev, u32 feature)
 {
 	if (WARN_ON_ONCE(!dev))
 		return -EINVAL;
 
-	cpu_to_le32s(&feature);
-
-	return usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
-		USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, feature, 0, NULL, 0,
-		USB_CTRL_SET_TIMEOUT);
+	return usbnet_write_cmd_nopm(dev, USB_REQ_SET_FEATURE,
+				     USB_DIR_OUT | USB_RECIP_DEVICE,
+				     feature, 0, NULL, 0);
 }
 
 static int smsc75xx_clear_feature(struct usbnet *dev, u32 feature)
@@ -146,11 +178,9 @@ static int smsc75xx_clear_feature(struct usbnet *dev, u32 feature)
 	if (WARN_ON_ONCE(!dev))
 		return -EINVAL;
 
-	cpu_to_le32s(&feature);
-
-	return usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
-		USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, feature, 0, NULL, 0,
-		USB_CTRL_SET_TIMEOUT);
+	return usbnet_write_cmd_nopm(dev, USB_REQ_CLEAR_FEATURE,
+				     USB_DIR_OUT | USB_RECIP_DEVICE,
+				     feature, 0, NULL, 0);
 }
 
 /* Loop until the read is completed with timeout
@@ -796,13 +826,16 @@ static int smsc75xx_set_features(struct net_device *netdev,
 	return 0;
 }
 
-static int smsc75xx_wait_ready(struct usbnet *dev)
+static int smsc75xx_wait_ready(struct usbnet *dev, int in_pm)
 {
 	int timeout = 0;
 
 	do {
 		u32 buf;
-		int ret = smsc75xx_read_reg(dev, PMT_CTL, &buf);
+		int ret;
+
+		ret = __smsc75xx_read_reg(dev, PMT_CTL, &buf, in_pm);
+
 		check_warn_return(ret, "Failed to read PMT_CTL: %d", ret);
 
 		if (buf & PMT_CTL_DEV_RDY)
@@ -824,7 +857,7 @@ static int smsc75xx_reset(struct usbnet *dev)
 
 	netif_dbg(dev, ifup, dev->net, "entering smsc75xx_reset");
 
-	ret = smsc75xx_wait_ready(dev);
+	ret = smsc75xx_wait_ready(dev, 0);
 	check_warn_return(ret, "device not ready in smsc75xx_reset");
 
 	ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
@@ -1191,30 +1224,30 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message)
 		netdev_info(dev->net, "entering SUSPEND2 mode");
 
 		/* disable energy detect (link up) & wake up events */
-		ret = smsc75xx_read_reg(dev, WUCSR, &val);
+		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val &= ~(WUCSR_MPEN | WUCSR_WUEN);
 
-		ret = smsc75xx_write_reg(dev, WUCSR, val);
+		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 
-		ret = smsc75xx_read_reg(dev, PMT_CTL, &val);
+		ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
 		check_warn_return(ret, "Error reading PMT_CTL");
 
 		val &= ~(PMT_CTL_ED_EN | PMT_CTL_WOL_EN);
 
-		ret = smsc75xx_write_reg(dev, PMT_CTL, val);
+		ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
 		check_warn_return(ret, "Error writing PMT_CTL");
 
 		/* enter suspend2 mode */
-		ret = smsc75xx_read_reg(dev, PMT_CTL, &val);
+		ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
 		check_warn_return(ret, "Error reading PMT_CTL");
 
 		val &= ~(PMT_CTL_SUS_MODE | PMT_CTL_WUPS | PMT_CTL_PHY_RST);
 		val |= PMT_CTL_SUS_MODE_2;
 
-		ret = smsc75xx_write_reg(dev, PMT_CTL, val);
+		ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
 		check_warn_return(ret, "Error writing PMT_CTL");
 
 		return 0;
@@ -1225,7 +1258,7 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message)
 
 		/* disable all filters */
 		for (i = 0; i < WUF_NUM; i++) {
-			ret = smsc75xx_write_reg(dev, WUF_CFGX + i * 4, 0);
+			ret = smsc75xx_write_reg_nopm(dev, WUF_CFGX + i * 4, 0);
 			check_warn_return(ret, "Error writing WUF_CFGX");
 		}
 
@@ -1250,95 +1283,95 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message)
 		}
 
 		/* clear any pending pattern match packet status */
-		ret = smsc75xx_read_reg(dev, WUCSR, &val);
+		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val |= WUCSR_WUFR;
 
-		ret = smsc75xx_write_reg(dev, WUCSR, val);
+		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 
 		netdev_info(dev->net, "enabling packet match detection");
-		ret = smsc75xx_read_reg(dev, WUCSR, &val);
+		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val |= WUCSR_WUEN;
 
-		ret = smsc75xx_write_reg(dev, WUCSR, val);
+		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 	} else {
 		netdev_info(dev->net, "disabling packet match detection");
-		ret = smsc75xx_read_reg(dev, WUCSR, &val);
+		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val &= ~WUCSR_WUEN;
 
-		ret = smsc75xx_write_reg(dev, WUCSR, val);
+		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 	}
 
 	/* disable magic, bcast & unicast wakeup sources */
-	ret = smsc75xx_read_reg(dev, WUCSR, &val);
+	ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
 	check_warn_return(ret, "Error reading WUCSR");
 
 	val &= ~(WUCSR_MPEN | WUCSR_BCST_EN | WUCSR_PFDA_EN);
 
-	ret = smsc75xx_write_reg(dev, WUCSR, val);
+	ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
 	check_warn_return(ret, "Error writing WUCSR");
 
 	if (pdata->wolopts & WAKE_MAGIC) {
 		netdev_info(dev->net, "enabling magic packet wakeup");
-		ret = smsc75xx_read_reg(dev, WUCSR, &val);
+		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		/* clear any pending magic packet status */
 		val |= WUCSR_MPR | WUCSR_MPEN;
 
-		ret = smsc75xx_write_reg(dev, WUCSR, val);
+		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 	}
 
 	if (pdata->wolopts & WAKE_BCAST) {
 		netdev_info(dev->net, "enabling broadcast detection");
-		ret = smsc75xx_read_reg(dev, WUCSR, &val);
+		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val |= WUCSR_BCAST_FR | WUCSR_BCST_EN;
 
-		ret = smsc75xx_write_reg(dev, WUCSR, val);
+		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 	}
 
 	if (pdata->wolopts & WAKE_UCAST) {
 		netdev_info(dev->net, "enabling unicast detection");
-		ret = smsc75xx_read_reg(dev, WUCSR, &val);
+		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val |= WUCSR_WUFR | WUCSR_PFDA_EN;
 
-		ret = smsc75xx_write_reg(dev, WUCSR, val);
+		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 	}
 
 	/* enable receiver to enable frame reception */
-	ret = smsc75xx_read_reg(dev, MAC_RX, &val);
+	ret = smsc75xx_read_reg_nopm(dev, MAC_RX, &val);
 	check_warn_return(ret, "Failed to read MAC_RX: %d", ret);
 
 	val |= MAC_RX_RXEN;
 
-	ret = smsc75xx_write_reg(dev, MAC_RX, val);
+	ret = smsc75xx_write_reg_nopm(dev, MAC_RX, val);
 	check_warn_return(ret, "Failed to write MAC_RX: %d", ret);
 
 	/* some wol options are enabled, so enter SUSPEND0 */
 	netdev_info(dev->net, "entering SUSPEND0 mode");
 
-	ret = smsc75xx_read_reg(dev, PMT_CTL, &val);
+	ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
 	check_warn_return(ret, "Error reading PMT_CTL");
 
 	val &= (~(PMT_CTL_SUS_MODE | PMT_CTL_PHY_RST));
 	val |= PMT_CTL_SUS_MODE_0 | PMT_CTL_WOL_EN | PMT_CTL_WUPS;
 
-	ret = smsc75xx_write_reg(dev, PMT_CTL, val);
+	ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
 	check_warn_return(ret, "Error writing PMT_CTL");
 
 	smsc75xx_set_feature(dev, USB_DEVICE_REMOTE_WAKEUP);
@@ -1359,37 +1392,37 @@ static int smsc75xx_resume(struct usb_interface *intf)
 		smsc75xx_clear_feature(dev, USB_DEVICE_REMOTE_WAKEUP);
 
 		/* Disable wakeup sources */
-		ret = smsc75xx_read_reg(dev, WUCSR, &val);
+		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val &= ~(WUCSR_WUEN | WUCSR_MPEN | WUCSR_PFDA_EN
 			| WUCSR_BCST_EN);
 
-		ret = smsc75xx_write_reg(dev, WUCSR, val);
+		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 
 		/* clear wake-up status */
-		ret = smsc75xx_read_reg(dev, PMT_CTL, &val);
+		ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
 		check_warn_return(ret, "Error reading PMT_CTL");
 
 		val &= ~PMT_CTL_WOL_EN;
 		val |= PMT_CTL_WUPS;
 
-		ret = smsc75xx_write_reg(dev, PMT_CTL, val);
+		ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
 		check_warn_return(ret, "Error writing PMT_CTL");
 	} else {
 		netdev_info(dev->net, "resuming from SUSPEND2");
 
-		ret = smsc75xx_read_reg(dev, PMT_CTL, &val);
+		ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
 		check_warn_return(ret, "Error reading PMT_CTL");
 
 		val |= PMT_CTL_PHY_PWRUP;
 
-		ret = smsc75xx_write_reg(dev, PMT_CTL, val);
+		ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
 		check_warn_return(ret, "Error writing PMT_CTL");
 	}
 
-	ret = smsc75xx_wait_ready(dev);
+	ret = smsc75xx_wait_ready(dev, 1);
 	check_warn_return(ret, "device not ready in smsc75xx_resume");
 
 	return usbnet_resume(intf);
-- 
1.7.9.5

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[PATCH v3 3/5] usbnet: smsc95xx: fix memory leak in smsc95xx_suspend

[Ming Lei]

This patch fixes memory leak in smsc95xx_suspend.

Also, it isn't necessary to bother mm to allocate 8bytes/16byte,
and we can use stack variable safely.

Cc: Steve Glendinning <steve.glendinning-nksJyM/082jR7s880joybQ@public.gmane.org>
Signed-off-by: Ming Lei <ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
---
 drivers/net/usb/smsc95xx.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index 34f2e78..8260c50 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -1070,11 +1070,15 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
 
 	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
 		u32 *filter_mask = kzalloc(32, GFP_KERNEL);
-		u32 *command = kzalloc(2, GFP_KERNEL);
-		u32 *offset = kzalloc(2, GFP_KERNEL);
-		u32 *crc = kzalloc(4, GFP_KERNEL);
+		u32 command[2];
+		u32 offset[2];
+		u32 crc[4];
 		int i, filter = 0;
 
+		memset(command, 0, sizeof(command));
+		memset(offset, 0, sizeof(offset));
+		memset(crc, 0, sizeof(crc));
+
 		if (pdata->wolopts & WAKE_BCAST) {
 			const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
 			netdev_info(dev->net, "enabling broadcast detection");
@@ -1131,6 +1135,8 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
 			check_warn_return(ret, "Error writing WUFF");
 		}
 
+		kfree(filter_mask);
+
 		for (i = 0; i < (pdata->wuff_filter_count / 4); i++) {
 			ret = smsc95xx_write_reg(dev, WUFF, command[i]);
 			check_warn_return(ret, "Error writing WUFF");
-- 
1.7.9.5

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[PATCH v3 4/5] usbnet: smsc95xx: apply the introduced usbnet_{read|write}_cmd_nopm

[Ming Lei]

This patch applies the introduced usbnet_read_cmd_nopm() and
usbnet_write_cmd_nopm() in the callback of resume and suspend
to avoid deadlock if USB runtime PM is considered into
usbnet_read_cmd() and usbnet_write_cmd().

Cc: Steve Glendinning <steve.glendinning-nksJyM/082jR7s880joybQ@public.gmane.org>
Signed-off-by: Ming Lei <ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
---
 drivers/net/usb/smsc95xx.c |  134 ++++++++++++++++++++++++++++----------------
 1 file changed, 85 insertions(+), 49 deletions(-)

diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index 8260c50..4cf43bf 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -73,20 +73,26 @@ static bool turbo_mode = true;
 module_param(turbo_mode, bool, 0644);
 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
 
-static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
-					  u32 *data)
+static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
+					    u32 *data, int in_pm)
 {
 	u32 buf;
 	int ret;
+	int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
 
 	BUG_ON(!dev);
 
-	ret = usbnet_read_cmd(dev, USB_VENDOR_REQUEST_READ_REGISTER,
-			      USB_DIR_IN | USB_TYPE_VENDOR |
-			      USB_RECIP_DEVICE,
-			      0, index, &buf, 4);
+	if (!in_pm)
+		fn = usbnet_read_cmd;
+	else
+		fn = usbnet_read_cmd_nopm;
+
+	ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
+		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+		 0, index, &buf, 4);
 	if (unlikely(ret < 0))
-		netdev_warn(dev->net, "Failed to read register index 0x%08x\n", index);
+		netdev_warn(dev->net,
+			"Failed to read reg index 0x%08x: %d", index, ret);
 
 	le32_to_cpus(&buf);
 	*data = buf;
@@ -94,35 +100,64 @@ static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
 	return ret;
 }
 
-static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
-					   u32 data)
+static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
+					     u32 data, int in_pm)
 {
 	u32 buf;
 	int ret;
+	int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 
 	BUG_ON(!dev);
 
+	if (!in_pm)
+		fn = usbnet_write_cmd;
+	else
+		fn = usbnet_write_cmd_nopm;
+
 	buf = data;
 	cpu_to_le32s(&buf);
 
-
-	ret = usbnet_write_cmd(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
-			       USB_DIR_OUT | USB_TYPE_VENDOR |
-			       USB_RECIP_DEVICE,
-			       0, index, &buf, 4);
+	ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
+		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+		 0, index, &buf, 4);
 	if (unlikely(ret < 0))
-		netdev_warn(dev->net, "Failed to write register index 0x%08x\n", index);
+		netdev_warn(dev->net,
+			"Failed to write reg index 0x%08x: %d", index, ret);
 
 	return ret;
 }
 
+static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
+					       u32 *data)
+{
+	return __smsc95xx_read_reg(dev, index, data, 1);
+}
+
+static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
+						u32 data)
+{
+	return __smsc95xx_write_reg(dev, index, data, 1);
+}
+
+static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
+					  u32 *data)
+{
+	return __smsc95xx_read_reg(dev, index, data, 0);
+}
+
+static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
+					   u32 data)
+{
+	return __smsc95xx_write_reg(dev, index, data, 0);
+}
 static int smsc95xx_set_feature(struct usbnet *dev, u32 feature)
 {
 	if (WARN_ON_ONCE(!dev))
 		return -EINVAL;
 
-	return usbnet_write_cmd(dev, USB_REQ_SET_FEATURE,
-				USB_RECIP_DEVICE, feature, 0, NULL, 0);
+	return usbnet_write_cmd_nopm(dev, USB_REQ_SET_FEATURE,
+				     USB_RECIP_DEVICE, feature, 0,
+				     NULL, 0);
 }
 
 static int smsc95xx_clear_feature(struct usbnet *dev, u32 feature)
@@ -130,8 +165,9 @@ static int smsc95xx_clear_feature(struct usbnet *dev, u32 feature)
 	if (WARN_ON_ONCE(!dev))
 		return -EINVAL;
 
-	return usbnet_write_cmd(dev, USB_REQ_CLEAR_FEATURE,
-				USB_RECIP_DEVICE, feature, 0, NULL, 0);
+	return usbnet_write_cmd_nopm(dev, USB_REQ_CLEAR_FEATURE,
+				     USB_RECIP_DEVICE, feature,
+				     0, NULL, 0);
 }
 
 /* Loop until the read is completed with timeout
@@ -708,7 +744,7 @@ static int smsc95xx_start_tx_path(struct usbnet *dev)
 }
 
 /* Starts the Receive path */
-static int smsc95xx_start_rx_path(struct usbnet *dev)
+static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
 {
 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 	unsigned long flags;
@@ -718,7 +754,7 @@ static int smsc95xx_start_rx_path(struct usbnet *dev)
 	pdata->mac_cr |= MAC_CR_RXEN_;
 	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 
-	ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
+	ret = __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
 	check_warn_return(ret, "Failed to write MAC_CR: %d\n", ret);
 
 	return 0;
@@ -937,7 +973,7 @@ static int smsc95xx_reset(struct usbnet *dev)
 	ret = smsc95xx_start_tx_path(dev);
 	check_warn_return(ret, "Failed to start TX path");
 
-	ret = smsc95xx_start_rx_path(dev);
+	ret = smsc95xx_start_rx_path(dev, 0);
 	check_warn_return(ret, "Failed to start RX path");
 
 	netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
@@ -1039,30 +1075,30 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
 		netdev_info(dev->net, "entering SUSPEND2 mode");
 
 		/* disable energy detect (link up) & wake up events */
-		ret = smsc95xx_read_reg(dev, WUCSR, &val);
+		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
 
-		ret = smsc95xx_write_reg(dev, WUCSR, val);
+		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 
-		ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
+		ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
 		check_warn_return(ret, "Error reading PM_CTRL");
 
 		val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
 
-		ret = smsc95xx_write_reg(dev, PM_CTRL, val);
+		ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
 		check_warn_return(ret, "Error writing PM_CTRL");
 
 		/* enter suspend2 mode */
-		ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
+		ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
 		check_warn_return(ret, "Error reading PM_CTRL");
 
 		val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
 		val |= PM_CTL_SUS_MODE_2;
 
-		ret = smsc95xx_write_reg(dev, PM_CTRL, val);
+		ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
 		check_warn_return(ret, "Error writing PM_CTRL");
 
 		return 0;
@@ -1131,50 +1167,50 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
 		}
 
 		for (i = 0; i < (pdata->wuff_filter_count * 4); i++) {
-			ret = smsc95xx_write_reg(dev, WUFF, filter_mask[i]);
+			ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
 			check_warn_return(ret, "Error writing WUFF");
 		}
 
 		kfree(filter_mask);
 
 		for (i = 0; i < (pdata->wuff_filter_count / 4); i++) {
-			ret = smsc95xx_write_reg(dev, WUFF, command[i]);
+			ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
 			check_warn_return(ret, "Error writing WUFF");
 		}
 
 		for (i = 0; i < (pdata->wuff_filter_count / 4); i++) {
-			ret = smsc95xx_write_reg(dev, WUFF, offset[i]);
+			ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
 			check_warn_return(ret, "Error writing WUFF");
 		}
 
 		for (i = 0; i < (pdata->wuff_filter_count / 2); i++) {
-			ret = smsc95xx_write_reg(dev, WUFF, crc[i]);
+			ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
 			check_warn_return(ret, "Error writing WUFF");
 		}
 
 		/* clear any pending pattern match packet status */
-		ret = smsc95xx_read_reg(dev, WUCSR, &val);
+		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val |= WUCSR_WUFR_;
 
-		ret = smsc95xx_write_reg(dev, WUCSR, val);
+		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 	}
 
 	if (pdata->wolopts & WAKE_MAGIC) {
 		/* clear any pending magic packet status */
-		ret = smsc95xx_read_reg(dev, WUCSR, &val);
+		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val |= WUCSR_MPR_;
 
-		ret = smsc95xx_write_reg(dev, WUCSR, val);
+		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 	}
 
 	/* enable/disable wakeup sources */
-	ret = smsc95xx_read_reg(dev, WUCSR, &val);
+	ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
 	check_warn_return(ret, "Error reading WUCSR");
 
 	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
@@ -1193,41 +1229,41 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
 		val &= ~WUCSR_MPEN_;
 	}
 
-	ret = smsc95xx_write_reg(dev, WUCSR, val);
+	ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
 	check_warn_return(ret, "Error writing WUCSR");
 
 	/* enable wol wakeup source */
-	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
+	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
 	check_warn_return(ret, "Error reading PM_CTRL");
 
 	val |= PM_CTL_WOL_EN_;
 
-	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
+	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
 	check_warn_return(ret, "Error writing PM_CTRL");
 
 	/* enable receiver to enable frame reception */
-	smsc95xx_start_rx_path(dev);
+	smsc95xx_start_rx_path(dev, 1);
 
 	/* some wol options are enabled, so enter SUSPEND0 */
 	netdev_info(dev->net, "entering SUSPEND0 mode");
 
-	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
+	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
 	check_warn_return(ret, "Error reading PM_CTRL");
 
 	val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
 	val |= PM_CTL_SUS_MODE_0;
 
-	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
+	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
 	check_warn_return(ret, "Error writing PM_CTRL");
 
 	/* clear wol status */
 	val &= ~PM_CTL_WUPS_;
 	val |= PM_CTL_WUPS_WOL_;
-	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
+	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
 	check_warn_return(ret, "Error writing PM_CTRL");
 
 	/* read back PM_CTRL */
-	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
+	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
 	check_warn_return(ret, "Error reading PM_CTRL");
 
 	smsc95xx_set_feature(dev, USB_DEVICE_REMOTE_WAKEUP);
@@ -1248,22 +1284,22 @@ static int smsc95xx_resume(struct usb_interface *intf)
 		smsc95xx_clear_feature(dev, USB_DEVICE_REMOTE_WAKEUP);
 
 		/* clear wake-up sources */
-		ret = smsc95xx_read_reg(dev, WUCSR, &val);
+		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
 
-		ret = smsc95xx_write_reg(dev, WUCSR, val);
+		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 
 		/* clear wake-up status */
-		ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
+		ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
 		check_warn_return(ret, "Error reading PM_CTRL");
 
 		val &= ~PM_CTL_WOL_EN_;
 		val |= PM_CTL_WUPS_;
 
-		ret = smsc95xx_write_reg(dev, PM_CTRL, val);
+		ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
 		check_warn_return(ret, "Error writing PM_CTRL");
 	}
 
-- 
1.7.9.5

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[PATCH v3 5/5] usbnet: runtime wake up device before calling usbnet_{read|write}_cmd

[Ming Lei]

This patch gets the runtime PM reference count before calling
usbnet_{read|write}_cmd, and puts it after completion of the
usbnet_{read|write}_cmd, so that the usb control message can always
be sent to one active device in the non-PM context.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
---
 drivers/net/usb/usbnet.c |   20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index a7fb074..08c4759 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1673,8 +1673,14 @@ out:
 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
 		    u16 value, u16 index, void *data, u16 size)
 {
-	return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
-				 data, size);
+	int ret;
+
+	if (usb_autopm_get_interface(dev->intf) < 0)
+		return -ENODEV;
+	ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
+				data, size);
+	usb_autopm_put_interface(dev->intf);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
 
@@ -1685,8 +1691,14 @@ EXPORT_SYMBOL_GPL(usbnet_read_cmd);
 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
 		     u16 value, u16 index, const void *data, u16 size)
 {
-	return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
-				  data, size);
+	int ret;
+
+	if (usb_autopm_get_interface(dev->intf) < 0)
+		return -ENODEV;
+	ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
+				 data, size);
+	usb_autopm_put_interface(dev->intf);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
 
-- 
1.7.9.5

Re: [PATCH v3 3/5] usbnet: smsc95xx: fix memory leak in smsc95xx_suspend

[Steve Glendinning]

On 6 November 2012 01:45, Ming Lei <ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> wrote:
> This patch fixes memory leak in smsc95xx_suspend.

Good spot, thanks!

Note that check_warn_return just above your kfree can cause early
return in the error case, which would still leak filter_mask, so we
might want to explicitly expand that instance of the helper macro.

> Also, it isn't necessary to bother mm to allocate 8bytes/16byte,
> and we can use stack variable safely.

Acked-By: Steve Glendinning <steve.glendinning-nksJyM/082jR7s880joybQ@public.gmane.org>
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Re: [PATCH v3 3/5] usbnet: smsc95xx: fix memory leak in smsc95xx_suspend

[Ming Lei]

On Tue, Nov 6, 2012 at 9:20 PM, Steve Glendinning <steve@shawell.net> wrote:
> On 6 November 2012 01:45, Ming Lei <ming.lei@canonical.com> wrote:
>> This patch fixes memory leak in smsc95xx_suspend.
>
> Good spot, thanks!
>
> Note that check_warn_return just above your kfree can cause early
> return in the error case, which would still leak filter_mask, so we
> might want to explicitly expand that instance of the helper macro.

OK, will update the patch.

BTW, I just saw the smsc95xx datasheet and the vendor's driver
source code, and found the chip supports runtime PM well
(remote wakeup on 'good packet' or link change), so do you
plan to implement that?

Thanks,
--
Ming Lei

Re: [PATCH v3 3/5] usbnet: smsc95xx: fix memory leak in smsc95xx_suspend

[Steve Glendinning]

> BTW, I just saw the smsc95xx datasheet and the vendor's driver
> source code, and found the chip supports runtime PM well
> (remote wakeup on 'good packet' or link change), so do you
> plan to implement that?

Yes, I do plan to implement this.  Note that this feature is only
supported on some product variants, for example LAN9500A, so it won't
benefit all smsc95xx users.

Re: [PATCH v3 3/5] usbnet: smsc95xx: fix memory leak in smsc95xx_suspend

[Ming Lei]

On Tue, Nov 6, 2012 at 9:58 PM, Steve Glendinning <steve@shawell.net> wrote:
>> BTW, I just saw the smsc95xx datasheet and the vendor's driver
>> source code, and found the chip supports runtime PM well
>> (remote wakeup on 'good packet' or link change), so do you
>> plan to implement that?
>
> Yes, I do plan to implement this.

Good news, :-)

> Note that this feature is only
> supported on some product variants, for example LAN9500A, so it won't
> benefit all smsc95xx users.

Right.  Looks remote wakeup on “Link Status Change” (SUSPEND1)
can be supported by all smsc95xx , and remote wakeup on 'good
packets'(SUSPEND3) is only supported by LAN9500A.

Thanks,
--
Ming Lei


Thanks,
--
Ming Lei