[PATCH] virtio_ring: remove unnecessary to_vvq call in vring hot path

[Deming Wang <wangdeming@inspur.com>]

It passes '_vq' to virtqueue_detach_unused_buf_packed(),
which still calls to_vvq to get 'vq', let's directly
pass 'vq'. It can avoid unnecessary call of to_vvq in hot path.

Signed-off-by: Deming Wang <wangdeming@inspur.com>
---
 drivers/virtio/virtio_ring.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 13a7348cedff..905d003f6849 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1593,9 +1593,8 @@ static bool virtqueue_enable_cb_delayed_packed(struct virtqueue *_vq)
 	return true;
 }
 
-static void *virtqueue_detach_unused_buf_packed(struct virtqueue *_vq)
+static void *virtqueue_detach_unused_buf_packed(struct vring_virtqueue *vq)
 {
-	struct vring_virtqueue *vq = to_vvq(_vq);
 	unsigned int i;
 	void *buf;
 
@@ -2115,7 +2114,7 @@ void *virtqueue_detach_unused_buf(struct virtqueue *_vq)
 {
 	struct vring_virtqueue *vq = to_vvq(_vq);
 
-	return vq->packed_ring ? virtqueue_detach_unused_buf_packed(_vq) :
+	return vq->packed_ring ? virtqueue_detach_unused_buf_packed(vq) :
 				 virtqueue_detach_unused_buf_split(_vq);
 }
 EXPORT_SYMBOL_GPL(virtqueue_detach_unused_buf);
-- 
2.27.0