netdev - [PATCH] usbnet: ignore get interface retval of -EINPROGRESS

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Message-ID: <CAPopfEUUaEChuh1mdZnHHT_9uRfsQmwMu7=gjnYr=AmFWik2HA@mail.gmail.com>
Date:	Sat, 3 Sep 2011 09:21:00 -0500
From:	Jim Wylder <jwylder1@...orola.com>
To:	Oliver Neukum <oneukum@...e.de>, netdev@...r.kernel.org
Subject: [PATCH] usbnet: ignore get interface retval of -EINPROGRESS

When calling pm_runtime_get, usb_autopm_get_interface_async
treats a return value of -EINPROGRESS as a success and
increments the usage count.  Since the interface is resuming,
it is safe for usbnet_start_xmit to submit the urb.  If instead,
usbnet_start_xmit treats this as an error the packet will be
dropped.  Additionally, a corresponding tx_complete will not
run to offset the earlier increment of the usage count from the
call to usb_autopm_get_interface_async.

Signed-off-by: James Wylder <james.wylder@...orola.com>
---
 drivers/net/usb/usbnet.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index ce395fe..90849d6 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1105,7 +1105,7 @@ netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,

 	spin_lock_irqsave(&dev->txq.lock, flags);
 	retval = usb_autopm_get_interface_async(dev->intf);
-	if (retval < 0) {
+	if (retval < 0 && retval != -EINPROGRESS) {
 		spin_unlock_irqrestore(&dev->txq.lock, flags);
 		goto drop;
 	}
-- 
1.7.6
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