linux-kernel - [RFC PATCH 03/17] virtio_console: Remove unused used length

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Date:   Mon, 17 May 2021 17:08:22 +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 03/17] virtio_console: Remove unused used length

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@...edance.com>
---
 drivers/char/virtio_console.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 1836cc56e357..b85abe1eb2d1 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -549,7 +549,6 @@ static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id,
 {
 	struct scatterlist sg[1];
 	struct virtqueue *vq;
-	unsigned int len;
 
 	if (!use_multiport(portdev))
 		return 0;
@@ -566,7 +565,7 @@ static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id,
 
 	if (virtqueue_add_outbuf(vq, sg, 1, &portdev->cpkt, GFP_ATOMIC) == 0) {
 		virtqueue_kick(vq);
-		while (!virtqueue_get_buf(vq, &len)
+		while (!virtqueue_get_buf(vq, NULL)
 			&& !virtqueue_is_broken(vq))
 			cpu_relax();
 	}
@@ -589,13 +588,12 @@ static ssize_t send_control_msg(struct port *port, unsigned int event,
 static void reclaim_consumed_buffers(struct port *port)
 {
 	struct port_buffer *buf;
-	unsigned int len;
 
 	if (!port->portdev) {
 		/* Device has been unplugged.  vqs are already gone. */
 		return;
 	}
-	while ((buf = virtqueue_get_buf(port->out_vq, &len))) {
+	while ((buf = virtqueue_get_buf(port->out_vq, NULL))) {
 		free_buf(buf, false);
 		port->outvq_full = false;
 	}
@@ -608,7 +606,6 @@ static ssize_t __send_to_port(struct port *port, struct scatterlist *sg,
 	struct virtqueue *out_vq;
 	int err;
 	unsigned long flags;
-	unsigned int len;
 
 	out_vq = port->out_vq;
 
@@ -641,7 +638,7 @@ static ssize_t __send_to_port(struct port *port, struct scatterlist *sg,
 	 * we need to kmalloc a GFP_ATOMIC buffer each time the
 	 * console driver writes something out.
 	 */
-	while (!virtqueue_get_buf(out_vq, &len)
+	while (!virtqueue_get_buf(out_vq, NULL)
 		&& !virtqueue_is_broken(out_vq))
 		cpu_relax();
 done:
@@ -1730,9 +1727,8 @@ static void control_work_handler(struct work_struct *work)
 static void flush_bufs(struct virtqueue *vq, bool can_sleep)
 {
 	struct port_buffer *buf;
-	unsigned int len;
 
-	while ((buf = virtqueue_get_buf(vq, &len)))
+	while ((buf = virtqueue_get_buf(vq, NULL)))
 		free_buf(buf, can_sleep);
 }
 
-- 
2.11.0