[Lguest] [PATCH 1/3] virtio: fix avail event support

[Michael S. Tsirkin]

make valid flag false, not true, on overrun

Reported-by: Tom Lendacky <tahm at linux.vnet.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
---
 drivers/virtio/virtio_ring.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 57bf9d5..0ea0781 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -242,7 +242,7 @@ add_head:
 	 * kicked_avail index we stored. TODO: make sure all drivers
 	 * kick at least once in 2^16 and remove this. */
 	if (unlikely(vq->vring.avail->idx == vq->kicked_avail))
-		vq->kicked_avail_valid = true;
+		vq->kicked_avail_valid = false;
 
 	pr_debug("Added buffer head %i to %p\n", head, vq);
 	END_USE(vq);
-- 
1.7.5.53.gc233e