On Mon, Oct 06, 2014 at 01:56:10PM +0200, Cornelia Huck wrote:

On Sun, 5 Oct 2014 19:07:16 +0300
"Michael S. Tsirkin" [off-list ref] wrote:

quoted

config_mutex served two purposes: prevent multiple concurrent config
change handlers, and synchronize access to config_enable flag.

Since commit dbf2576e37da0fcc7aacbfbb9fd5d3de7888a3c1
    workqueue: make all workqueues non-reentrant
all workqueues are non-reentrant, and config_enable
is now gone.

Get rid of the unnecessary lock.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 drivers/net/virtio_net.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index fa17afa..d80fef4 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c

quoted

@@ -1430,7 +1426,7 @@ static void virtnet_config_changed_work(struct work_struct *work)
 		netif_tx_stop_all_queues(vi->dev);
 	}
 done:
-	mutex_unlock(&vi->config_lock);
+	return;
 }

 static void virtnet_config_changed(struct virtio_device *vdev)

I'd probably return directly in the remaining 'goto done;' cases, but still

Reviewed-by: Cornelia Huck <redacted>

Yes: this is exactly what
[PATCH 11/16] virtio_net: minor cleanup
does

-- 
MST