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authorJason Wang <jasowang@redhat.com>2013-12-30 11:34:40 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-01-15 15:28:50 -0800
commit6a0827c4051600d836b16ed9cb6caf78b26573bc (patch)
treeeb8ca8e5bf4b0c3c32d1429cd4c29295719bb015 /drivers/net
parentfcd8e312578603626f0d78084d7ec2e444489aa4 (diff)
downloadlinaro-lsk-6a0827c4051600d836b16ed9cb6caf78b26573bc.tar.gz
virtio-net: fix refill races during restore
[ Upstream commit 6cd4ce0099da7702f885b6fa9ebb49e3831d90b4 ] During restoring, try_fill_recv() was called with neither napi lock nor napi disabled. This can lead two try_fill_recv() was called in the same time. Fix this by refilling before trying to enable napi. Fixes 0741bcb5584f9e2390ae6261573c4de8314999f2 (virtio: net: Add freeze, restore handlers to support S4). Cc: Amit Shah <amit.shah@redhat.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/virtio_net.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 68692af1f48..a0c05e07fee 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1745,16 +1745,17 @@ static int virtnet_restore(struct virtio_device *vdev)
if (err)
return err;
- if (netif_running(vi->dev))
+ if (netif_running(vi->dev)) {
+ for (i = 0; i < vi->curr_queue_pairs; i++)
+ if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
+ schedule_delayed_work(&vi->refill, 0);
+
for (i = 0; i < vi->max_queue_pairs; i++)
virtnet_napi_enable(&vi->rq[i]);
+ }
netif_device_attach(vi->dev);
- for (i = 0; i < vi->curr_queue_pairs; i++)
- if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
- schedule_delayed_work(&vi->refill, 0);
-
mutex_lock(&vi->config_lock);
vi->config_enable = true;
mutex_unlock(&vi->config_lock);