From a72caae21803b74e04e2afda5e035f149d4ea118 Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@redhat.com>
Date: Fri, 20 Jan 2012 16:17:08 +0800
Subject: [PATCH] virtio: correct the memory barrier in
 virtqueue_kick_prepare()

Use virtio_mb() to make sure the available index to be exposed before
checking the the avail event. Otherwise we may get stale value of
avail event in guest and never kick the host after.

Note: this fixes a bug introduced by ee7cd8981e15bcb365fc762afe3fc47b8242f630.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
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