linux-kernel - [PATCH 1/6] virtio: ignore corrupted virtqueues rather than spinning.

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Date:	Wed, 23 Apr 2008 23:55:47 -0500
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	linux-kernel@...r.kernel.org
Cc:	virtualization@...ts.linux-foundation.org
Subject: [PATCH 1/6] 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@...tcorp.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);

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