linux-kernel - [RFC PATCH 14/17] virtio_mem: Remove unused used length

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Message-Id: <20210517090836.533-15-xieyongji@bytedance.com>
Date:   Mon, 17 May 2021 17:08:33 +0800
From:   Xie Yongji <xieyongji@...edance.com>
To:     mst@...hat.com, jasowang@...hat.com, stefanha@...hat.com
Cc:     amit@...nel.org, arei.gonglei@...wei.com, airlied@...ux.ie,
        kraxel@...hat.com, dan.j.williams@...el.com,
        johannes@...solutions.net, ohad@...ery.com,
        bjorn.andersson@...aro.org, david@...hat.com, vgoyal@...hat.com,
        miklos@...redi.hu, sgarzare@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 14/17] virtio_mem: Remove unused used length

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

Signed-off-by: Xie Yongji <xieyongji@...edance.com>
---
 drivers/virtio/virtio_mem.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index 10ec60d81e84..32a8e359a5c3 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -1256,7 +1256,6 @@ static uint64_t virtio_mem_send_request(struct virtio_mem *vm,
 					const struct virtio_mem_req *req)
 {
 	struct scatterlist *sgs[2], sg_req, sg_resp;
-	unsigned int len;
 	int rc;
 
 	/* don't use the request residing on the stack (vaddr) */
@@ -1277,7 +1276,7 @@ static uint64_t virtio_mem_send_request(struct virtio_mem *vm,
 	virtqueue_kick(vm->vq);
 
 	/* wait for a response */
-	wait_event(vm->host_resp, virtqueue_get_buf(vm->vq, &len));
+	wait_event(vm->host_resp, virtqueue_get_buf(vm->vq, NULL));
 
 	return virtio16_to_cpu(vm->vdev, vm->resp.type);
 }
-- 
2.11.0