Patchwork Fix panic in virtnet_remove

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Submitter Krishna Kumar
Date July 20, 2011, 7:43 a.m.
Message ID <20110720074339.7842.72593.sendpatchset@krkumar2.in.ibm.com>
Download mbox | patch
Permalink /patch/105884/
State Superseded
Delegated to: David Miller
Headers show

Comments

Krishna Kumar - July 20, 2011, 7:43 a.m.
Fix a panic in virtnet_remove. unregister_netdev has already
freed up the netdev (and virtnet_info) due to dev->destructor
being set, while virtnet_info is still required. Remove
virtnet_free altogether, and move the freeing of the per-cpu
statistics from virtnet_free to virtnet_remove.

Tested patch below.

Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com>
---
 drivers/net/virtio_net.c |   10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

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Patch

diff -ruNp org/drivers/net/virtio_net.c new/drivers/net/virtio_net.c
--- org/drivers/net/virtio_net.c	2011-07-18 09:14:02.000000000 +0530
+++ new/drivers/net/virtio_net.c	2011-07-18 09:16:35.000000000 +0530
@@ -705,14 +705,6 @@  static void virtnet_netpoll(struct net_d
 }
 #endif
 
-static void virtnet_free(struct net_device *dev)
-{
-	struct virtnet_info *vi = netdev_priv(dev);
-
-	free_percpu(vi->stats);
-	free_netdev(dev);
-}
-
 static int virtnet_open(struct net_device *dev)
 {
 	struct virtnet_info *vi = netdev_priv(dev);
@@ -959,7 +951,6 @@  static int virtnet_probe(struct virtio_d
 	/* Set up network device as normal. */
 	dev->netdev_ops = &virtnet_netdev;
 	dev->features = NETIF_F_HIGHDMA;
-	dev->destructor = virtnet_free;
 
 	SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
 	SET_NETDEV_DEV(dev, &vdev->dev);
@@ -1122,6 +1113,7 @@  static void __devexit virtnet_remove(str
 	while (vi->pages)
 		__free_pages(get_a_page(vi, GFP_KERNEL), 0);
 
+	free_percpu(vi->stats);
 	free_netdev(vi->dev);
 }