netdev - [PATCH] usbnet: fix deadlock in resume

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Date:	Mon, 27 Aug 2012 08:41:38 +0200
From:	oliver@...kum.org
To:	davem@...emloft.net, netdev@...r.kernel.org, ming.lei@...onical.com
Cc:	Oliver Neukum <oliver@...kum.org>, Oliver Neukum <oneukum@...e.de>,
	stable@...nel.org
Subject: [PATCH] usbnet: fix deadlock in resume

From: Oliver Neukum <oliver@...kum.org>

A usbnet device can share a multifunction device
with a storage device. If the storage device is autoresumed
the usbnet devices also needs to be autoresumed. Allocating
memory with GFP_KERNEL can deadlock in this case.

This should go back into all kernels that have
commit 65841fd5132c3941cdf5df09e70df3ed28323212
That is 3.5

Signed-off-by: Oliver Neukum <oneukum@...e.de>
CC: stable@...nel.org
---
 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 8531c1c..fd4b26d 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1573,7 +1573,7 @@ int usbnet_resume (struct usb_interface *intf)
 				netif_device_present(dev->net) &&
 				!timer_pending(&dev->delay) &&
 				!test_bit(EVENT_RX_HALT, &dev->flags))
-					rx_alloc_submit(dev, GFP_KERNEL);
+					rx_alloc_submit(dev, GFP_NOIO);
 
 			if (!(dev->txq.qlen >= TX_QLEN(dev)))
 				netif_tx_wake_all_queues(dev->net);
-- 
1.7.7

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