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

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Date:	Thu, 5 May 2011 18:08:04 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Carsten Otte <cotte@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux390@...ibm.com, Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Shirley Ma <xma@...ibm.com>, lguest@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-s390@...r.kernel.org, kvm@...r.kernel.org,
	Krishna Kumar <krkumar2@...ibm.com>,
	Tom Lendacky <tahm@...ux.vnet.ibm.com>, steved@...ibm.com,
	habanero@...ux.vnet.ibm.com
Subject: [PATCH 1/3] virtio: fix avail event support

make valid flag false, not true, on overrun

Reported-by: Tom Lendacky <tahm@...ux.vnet.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.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

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