[PATCH] vhost: add mutex_lock/unlock for vhost_vq_reset

[Jia He]

vq->mutex is to protect any vq accessing, hence adding mutex_lock/unlock
makes sense to avoid potential race condition.

Signed-off-by: Jia He <justin...@arm.com>
---
 drivers/vhost/vhost.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index d450e16c5c25..622bfba2e5ab 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -297,6 +297,7 @@ static void vhost_vq_meta_reset(struct vhost_dev *d)
 static void vhost_vq_reset(struct vhost_dev *dev,
                           struct vhost_virtqueue *vq)
 {
+       mutex_lock(&vq->mutex);
        vq->num = 1;
        vq->desc = NULL;
        vq->avail = NULL;
@@ -323,6 +324,7 @@ static void vhost_vq_reset(struct vhost_dev *dev,
        vq->umem = NULL;
        vq->iotlb = NULL;
        __vhost_vq_meta_reset(vq);
+       mutex_unlock(&vq->mutex);
 }
 
 static int vhost_worker(void *data)
-- 
2.17.1