linux-kernel - [PATCH] virtio_ring: fix num

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Message-Id: <20180223114130.16332-1-tiwei.bie@intel.com>
Date:   Fri, 23 Feb 2018 19:41:30 +0800
From:   Tiwei Bie <tiwei.bie@...el.com>
To:     mst@...hat.com, jasowang@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Cc:     Andy Lutomirski <luto@...nel.org>, stable@...r.kernel.org
Subject: [PATCH] virtio_ring: fix num_free handling in error case

The vq->vq.num_free hasn't been changed when error happens,
so it shouldn't be changed when handling the error.

Fixes: 780bc7903a32 ("virtio_ring: Support DMA APIs")
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: stable@...r.kernel.org
Signed-off-by: Tiwei Bie <tiwei.bie@...el.com>
---
 drivers/virtio/virtio_ring.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index eb30f3e09a47..71458f493cf8 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -428,8 +428,6 @@ static inline int virtqueue_add(struct virtqueue *_vq,
 		i = virtio16_to_cpu(_vq->vdev, vq->vring.desc[i].next);
 	}
 
-	vq->vq.num_free += total_sg;
-
 	if (indirect)
 		kfree(desc);
 
-- 
2.11.0