diff mbox

[v4,14/25] 9p/trans_virtio: enable VQs early

Message ID 1413114332-626-15-git-send-email-mst-v4@redhat.com
State Not Applicable, archived
Delegated to: David Miller
Headers show

Commit Message

Michael S. Tsirkin Oct. 13, 2014, 7:50 a.m. UTC 
virtio spec requires drivers to set DRIVER_OK before using VQs.
This is set automatically after probe returns, but virtio 9p device
adds self to channel list within probe, at which point VQ can be
used in violation of the spec.

To fix, call virtio_device_ready before using VQs.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 net/9p/trans_virtio.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox

Patch

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 6940d8f..766ba48 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -575,6 +575,8 @@  static int p9_virtio_probe(struct virtio_device *vdev)
 	/* Ceiling limit to avoid denial of service attacks */
 	chan->p9_max_pages = nr_free_buffer_pages()/4;
 
+	virtio_device_ready(vdev);
+
 	mutex_lock(&virtio_9p_lock);
 	list_add_tail(&chan->chan_list, &virtio_chan_list);
 	mutex_unlock(&virtio_9p_lock);