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9p/trans_virtio: enable VQs early 

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>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Michael S. Tsirkin 2014-10-15 10:22:31 +10:30 committed by Rusty Russell
parent f5866db64f
commit 64b4cc3911
1 changed files with 2 additions and 0 deletions
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2
net/9p/trans_virtio.c
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@ -575,6 +575,8 @@ static int p9_virtio_probe(struct virtio_device *vdev)
/* Ceiling limit to avoid denial of service attacks */ /* Ceiling limit to avoid denial of service attacks */
chan->p9_max_pages = nr_free_buffer_pages()/4; chan->p9_max_pages = nr_free_buffer_pages()/4;
virtio_device_ready(vdev);
mutex_lock(&virtio_9p_lock); mutex_lock(&virtio_9p_lock);
list_add_tail(&chan->chan_list, &virtio_chan_list); list_add_tail(&chan->chan_list, &virtio_chan_list);
mutex_unlock(&virtio_9p_lock); mutex_unlock(&virtio_9p_lock);