netdev - [PATCH 4/4] usbnet: make device out of suspend before calling usbnet_read[write]

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Message-Id: <1351496709-26934-5-git-send-email-ming.lei@canonical.com>
Date:	Mon, 29 Oct 2012 15:45:09 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Oliver Neukum <oneukum@...e.de>, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org, Ming Lei <ming.lei@...onical.com>
Subject: [PATCH 4/4] usbnet: make device out of suspend before calling usbnet_read[write]_cmd

This patche 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@...onical.com>
---
 drivers/net/usb/usbnet.c |   18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index a7fb074..74caa67 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1673,8 +1673,13 @@ 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 +1690,13 @@ 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

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