virtio: ignore corrupted virtqueues rather than spinning.

A corrupt virtqueue (caused by the other end screwing up) can have
strange results such as a driver spinning: just bail when we try to
get a buffer from a known-broken queue.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 drivers/virtio/virtio_ring.c |    5 +++++
 1 file changed, 5 insertions(+)

diff -r cbd83e592664 drivers/virtio/virtio_ring.c
--- a/drivers/virtio/virtio_ring.c	Fri Apr 04 22:42:47 2008 +1100
+++ b/drivers/virtio/virtio_ring.c	Sat Apr 05 21:12:42 2008 +1100
@@ -184,6 +184,11 @@ static void *vring_get_buf(struct virtqu
 
 	START_USE(vq);
 
+	if (unlikely(vq->broken)) {
+		END_USE(vq);
+		return NULL;
+	}
+
 	if (!more_used(vq)) {
 		pr_debug("No more buffers in queue\n");
 		END_USE(vq);