Re: [PATCH repost] Fix panic in virtnet_remove

2011-07-21 Thread David Miller
From: "Michael S. Tsirkin" 
Date: Wed, 20 Jul 2011 17:31:15 +0300

> On Wed, Jul 20, 2011 at 07:26:02PM +0530, Krishna Kumar wrote:
>> 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 
> 
> Also note that the crash was apparently introduced by
> 3fa2a1df909482cc234524906e4bd30dee3514df in net-next,
> so this is a net-next only patch.
> 
> Stephen, was there any special reason to free the memory
> in the destructor like you did?
> 
> Acked-by: Michael S. Tsirkin 

Applied.
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Re: [PATCH repost] Fix panic in virtnet_remove

2011-07-20 Thread Michael S. Tsirkin
On Wed, Jul 20, 2011 at 07:26:02PM +0530, Krishna Kumar wrote:
> 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 

Also note that the crash was apparently introduced by
3fa2a1df909482cc234524906e4bd30dee3514df in net-next,
so this is a net-next only patch.

Stephen, was there any special reason to free the memory
in the destructor like you did?

Acked-by: Michael S. Tsirkin 

> ---
> (Michael suggested me to re-post with copy to all maintainers)
> 
>  drivers/net/virtio_net.c |   10 +-
>  1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff -ruNp org/drivers/net/virtio_net.c new/drivers/net/virtio_net.c
> --- org/drivers/net/virtio_net.c  2011-07-18 09:14:02.0 +0530
> +++ new/drivers/net/virtio_net.c  2011-07-18 09:16:35.0 +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);
>  }
>  
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[PATCH repost] Fix panic in virtnet_remove

2011-07-20 Thread Krishna Kumar
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 
---
(Michael suggested me to re-post with copy to all maintainers)

 drivers/net/virtio_net.c |   10 +-
 1 file changed, 1 insertion(+), 9 deletions(-)

diff -ruNp org/drivers/net/virtio_net.c new/drivers/net/virtio_net.c
--- org/drivers/net/virtio_net.c2011-07-18 09:14:02.0 +0530
+++ new/drivers/net/virtio_net.c2011-07-18 09:16:35.0 +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);
 }
 
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