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Subject[PATCH 2/3] vhost: better detection of available buffers
Date
We should use vq->last_avail_idx instead of vq->avail_idx in the
checking of vhost_vq_avail_empty() since latter is the cached avail
index from guest but we want to know if there's pending available
buffers in the virtqueue.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/vhost/vhost.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index c6f2d89..fdf4cdf 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -2230,7 +2230,7 @@ bool vhost_vq_avail_empty(struct vhost_dev *dev, struct vhost_virtqueue *vq)
if (r)
return false;

- return vhost16_to_cpu(vq, avail_idx) == vq->avail_idx;
+ return vhost16_to_cpu(vq, avail_idx) == vq->last_avail_idx;
}
EXPORT_SYMBOL_GPL(vhost_vq_avail_empty);

--
2.7.4
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