linux-kernel - [PATCH] vhost: add mutex_lock/unlock for vhost_vq

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Message-Id: <20200430024140.42065-1-justin.he@arm.com>
Date:   Thu, 30 Apr 2020 10:41:40 +0800
From:   Jia He <justin.he@....com>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kaly.Xin@....com, Jia He <justin.he@....com>
Subject: [PATCH] vhost: add mutex_lock/unlock for vhost_vq_reset

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.he@....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