diff options
| author | Rusty Russell <rusty@rustcorp.com.au> | 2011-12-29 04:42:38 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-12-30 01:44:29 +0400 |
| commit | b2baed69e605c3e57d28940cc7aaae908d61f769 (patch) | |
| tree | 47e23076688f9fae6b381143427958f661a31d97 | |
| parent | 346f870b8a9aaf0847f7c7cffdbb447bb2f3853e (diff) | |
| download | linux-b2baed69e605c3e57d28940cc7aaae908d61f769.tar.xz | |
virtio_net: set/cancel work on ndo_open/ndo_stop
Michael S. Tsirkin noticed that we could run the refill work after
ndo_close, which can re-enable napi - we don't disable it until
virtnet_remove. This is clearly wrong, so move the workqueue control
to ndo_open and ndo_stop (aka. virtnet_open and virtnet_close).
One subtle point: virtnet_probe() could simply fail if it couldn't
allocate a receive buffer, but that's less polite in virtnet_open() so
we schedule a refill as we do in the normal receive path if we run out
of memory.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/virtio_net.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index d1c3dce15dc2..07ca150a5ca6 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -440,7 +440,13 @@ static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp) return err; } -/* Returns false if we couldn't fill entirely (OOM). */ +/* + * Returns false if we couldn't fill entirely (OOM). + * + * Normally run in the receive path, but can also be run from ndo_open + * before we're receiving packets, or from refill_work which is + * careful to disable receiving (using napi_disable). + */ static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp) { int err; @@ -721,6 +727,10 @@ static int virtnet_open(struct net_device *dev) { struct virtnet_info *vi = netdev_priv(dev); + /* Make sure we have some buffers: if oom use wq. */ + if (!try_fill_recv(vi, GFP_KERNEL)) + schedule_delayed_work(&vi->refill, 0); + virtnet_napi_enable(vi); return 0; } @@ -774,6 +784,8 @@ static int virtnet_close(struct net_device *dev) { struct virtnet_info *vi = netdev_priv(dev); + /* Make sure refill_work doesn't re-enable napi! */ + cancel_delayed_work_sync(&vi->refill); napi_disable(&vi->napi); return 0; @@ -1100,7 +1112,6 @@ static int virtnet_probe(struct virtio_device *vdev) unregister: unregister_netdev(dev); - cancel_delayed_work_sync(&vi->refill); free_vqs: vdev->config->del_vqs(vdev); free_stats: @@ -1139,9 +1150,7 @@ static void __devexit virtnet_remove(struct virtio_device *vdev) /* Stop all the virtqueues. */ vdev->config->reset(vdev); - unregister_netdev(vi->dev); - cancel_delayed_work_sync(&vi->refill); /* Free unused buffers in both send and recv, if any. */ free_unused_bufs(vi); |