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virtio_ring: fix num_free handling in error case

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

Fixes: 780bc7903a ("virtio_ring: Support DMA APIs")
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Tiwei Bie 2018-02-23 19:41:30 +08:00 committed by Michael S. Tsirkin
parent 4a3928c6f8
commit e82df67023
1 changed files with 0 additions and 2 deletions
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2
drivers/virtio/virtio_ring.c
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@ -428,8 +428,6 @@ unmap_release:
i = virtio16_to_cpu(_vq->vdev, vq->vring.desc[i].next); i = virtio16_to_cpu(_vq->vdev, vq->vring.desc[i].next);
} }
vq->vq.num_free += total_sg;
if (indirect) if (indirect)
kfree(desc); kfree(desc);