[RFC PATCH 07/17] virtio_net: Remove unused used length

[Xie Yongji]

The used length is not used in some cases. Let's drop it
and pass NULL to virtqueue_get_buf() instead.

Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
---
 drivers/net/virtio_net.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 5ca7d6780add..01e54e99cae6 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -500,7 +500,6 @@ static int virtnet_xdp_xmit(struct net_device *dev,
 	struct receive_queue *rq = vi->rq;
 	struct bpf_prog *xdp_prog;
 	struct send_queue *sq;
-	unsigned int len;
 	int packets = 0;
 	int bytes = 0;
 	int drops = 0;
@@ -525,7 +524,7 @@ static int virtnet_xdp_xmit(struct net_device *dev,
 	}
 
 	/* Free up any pending old buffers before queueing new ones. */
-	while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
+	while ((ptr = virtqueue_get_buf(sq->vq, NULL)) != NULL) {
 		if (likely(is_xdp_frame(ptr))) {
 			struct xdp_frame *frame = ptr_to_xdp(ptr);
 
@@ -1378,12 +1377,11 @@ static int virtnet_receive(struct receive_queue *rq, int budget,
 
 static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi)
 {
-	unsigned int len;
 	unsigned int packets = 0;
 	unsigned int bytes = 0;
 	void *ptr;
 
-	while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
+	while ((ptr = virtqueue_get_buf(sq->vq, NULL)) != NULL) {
 		if (likely(!is_xdp_frame(ptr))) {
 			struct sk_buff *skb = ptr;
 
@@ -1681,7 +1679,7 @@ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
 				 struct scatterlist *out)
 {
 	struct scatterlist *sgs[4], hdr, stat;
-	unsigned out_num = 0, tmp;
+	unsigned out_num = 0;
 
 	/* Caller should know better */
 	BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
@@ -1709,7 +1707,7 @@ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
 	/* Spin for a response, the kick causes an ioport write, trapping
 	 * into the hypervisor, so the request should be handled immediately.
 	 */
-	while (!virtqueue_get_buf(vi->cvq, &tmp) &&
+	while (!virtqueue_get_buf(vi->cvq, NULL) &&
 	       !virtqueue_is_broken(vi->cvq))
 		cpu_relax();
 
-- 
2.11.0