From: Jason Wang Date: Tue, 15 Oct 2013 03:18:59 +0000 (+0800) Subject: virtio-net: refill only when device is up during setting queues X-Git-Tag: firefly_0821_release~176^2~5117^2~22 X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=35ed159bfd96a7547ec277ed8b550c7cbd9841b6;p=firefly-linux-kernel-4.4.55.git virtio-net: refill only when device is up during setting queues We used to schedule the refill work unconditionally after changing the number of queues. This may lead an issue if the device is not up. Since we only try to cancel the work in ndo_stop(), this may cause the refill work still work after removing the device. Fix this by only schedule the work when device is up. The bug were introduce by commit 9b9cd8024a2882e896c65222aa421d461354e3f2. (virtio-net: fix the race between channels setting and refill) Cc: Rusty Russell Cc: Michael S. Tsirkin Signed-off-by: Jason Wang Signed-off-by: David S. Miller --- diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index c4bc1cc7ef33..9fbdfcd1e1a0 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -938,7 +938,9 @@ static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) return -EINVAL; } else { vi->curr_queue_pairs = queue_pairs; - schedule_delayed_work(&vi->refill, 0); + /* virtnet_open() will refill when device is going to up. */ + if (dev->flags & IFF_UP) + schedule_delayed_work(&vi->refill, 0); } return 0; @@ -1741,7 +1743,9 @@ static int virtnet_restore(struct virtio_device *vdev) vi->config_enable = true; mutex_unlock(&vi->config_lock); + rtnl_lock(); virtnet_set_queues(vi, vi->curr_queue_pairs); + rtnl_unlock(); return 0; }