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List:       v9fs-developer
Subject:    [V9fs-developer] [PATCH 15/16] 9p/trans_virtio: enable VQs early
From:       "Michael S. Tsirkin" <mst () redhat ! com>
Date:       2014-10-05 16:07:33
Message-ID: 1412525038-15871-16-git-send-email-mst () redhat ! com
[Download RAW message or body]

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_early_enable_vqs before using VQs.

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

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 6940d8f..0e8bbb3 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_early_enable_vqs(vdev);
+
 	mutex_lock(&virtio_9p_lock);
 	list_add_tail(&chan->chan_list, &virtio_chan_list);
 	mutex_unlock(&virtio_9p_lock);
-- 
MST


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