From 5ef827526fc01820a7a80827802e9fad3f34f937 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Fri, 2 May 2008 21:50:43 -0500 Subject: 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 --- drivers/virtio/virtio_ring.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/virtio') diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index c2fa5c63081..937a49d6772 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -184,6 +184,11 @@ static void *vring_get_buf(struct virtqueue *_vq, unsigned int *len) 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); -- cgit v1.2.3