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authorMichael S. Tsirkin <mst@redhat.com>2014-10-15 03:52:32 +0400
committerRusty Russell <rusty@rustcorp.com.au>2014-10-15 03:55:07 +0400
commit6d62c37f1991aafc872f8d8be8ac60e57ede8605 (patch)
tree346383120729b4e6a49271289d617e0c8f487d48 /drivers/block
parentcd679048958011418f14a8fc7dfdb64ab72ca315 (diff)
downloadlinux-6d62c37f1991aafc872f8d8be8ac60e57ede8605.tar.xz
virtio_blk: enable VQs early on restore
virtio spec requires drivers to set DRIVER_OK before using VQs. This is set automatically after restore returns, virtio block violated this rule on restore by restarting queues, which might in theory cause the VQ to be used directly within restore. To fix, call virtio_device_ready before using starting queues. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/virtio_blk.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 34ec273b1d46..930fee886917 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -804,10 +804,13 @@ static int virtblk_restore(struct virtio_device *vdev)
int ret;
ret = init_vq(vdev->priv);
- if (!ret)
- blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
+ if (ret)
+ return ret;
+
+ virtio_device_ready(vdev);
- return ret;
+ blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
+ return 0;
}
#endif