linux-kernel - [PATCH 1/4] media: uvcvideo: Remove nodrop parameter

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Message-Id: <20251117-uvcdynctrl-v1-1-aed70eadf3d8@chromium.org>
Date: Mon, 17 Nov 2025 20:14:16 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Hans de Goede <hansg@...nel.org>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-usb@...r.kernel.org, Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH 1/4] media: uvcvideo: Remove nodrop parameter

We announced the deprecation intentions one year ago in the commit
commit 40ed9e9b2808 ("media: uvcvideo: Announce the user our deprecation
intentions").

We have not hear any complains, lets remove the nodrop parameter.

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_driver.c | 19 -------------------
 drivers/media/usb/uvc/uvc_queue.c  | 25 -------------------------
 drivers/media/usb/uvc/uvcvideo.h   |  1 -
 3 files changed, 45 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index ee4f54d6834962414979a046afc59c5036455124..71563d8f4bcf581694ccd4b665ff52b629caa0b6 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -32,7 +32,6 @@
 
 unsigned int uvc_clock_param = CLOCK_MONOTONIC;
 unsigned int uvc_hw_timestamps_param;
-unsigned int uvc_no_drop_param = 1;
 static unsigned int uvc_quirks_param = -1;
 unsigned int uvc_dbg_param;
 unsigned int uvc_timeout_param = UVC_CTRL_STREAMING_TIMEOUT;
@@ -2468,24 +2467,6 @@ MODULE_PARM_DESC(clock, "Video buffers timestamp clock");
 module_param_named(hwtimestamps, uvc_hw_timestamps_param, uint, 0644);
 MODULE_PARM_DESC(hwtimestamps, "Use hardware timestamps");
 
-static int param_set_nodrop(const char *val, const struct kernel_param *kp)
-{
-	pr_warn_once("uvcvideo: "
-		     DEPRECATED
-		     "nodrop parameter will be eventually removed.\n");
-	return param_set_bool(val, kp);
-}
-
-static const struct kernel_param_ops param_ops_nodrop = {
-	.set = param_set_nodrop,
-	.get = param_get_uint,
-};
-
-param_check_uint(nodrop, &uvc_no_drop_param);
-module_param_cb(nodrop, &param_ops_nodrop, &uvc_no_drop_param, 0644);
-__MODULE_PARM_TYPE(nodrop, "uint");
-MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
-
 module_param_named(quirks, uvc_quirks_param, uint, 0644);
 MODULE_PARM_DESC(quirks, "Forced device quirks");
 module_param_named(trace, uvc_dbg_param, uint, 0644);
diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
index 790184c9843d211d34fa7d66801631d5a07450bd..3bc54456b4d98ed50b1ea250ce8501e67141e1ef 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -331,34 +331,9 @@ struct uvc_buffer *uvc_queue_get_current_buffer(struct uvc_video_queue *queue)
 	return nextbuf;
 }
 
-/*
- * uvc_queue_buffer_requeue: Requeue a buffer on our internal irqqueue
- *
- * Reuse a buffer through our internal queue without the need to 'prepare'.
- * The buffer will be returned to userspace through the uvc_buffer_queue call if
- * the device has been disconnected.
- */
-static void uvc_queue_buffer_requeue(struct uvc_video_queue *queue,
-		struct uvc_buffer *buf)
-{
-	buf->error = 0;
-	buf->state = UVC_BUF_STATE_QUEUED;
-	buf->bytesused = 0;
-	vb2_set_plane_payload(&buf->buf.vb2_buf, 0, 0);
-
-	uvc_buffer_queue(&buf->buf.vb2_buf);
-}
-
 static void uvc_queue_buffer_complete(struct kref *ref)
 {
 	struct uvc_buffer *buf = container_of(ref, struct uvc_buffer, ref);
-	struct vb2_buffer *vb = &buf->buf.vb2_buf;
-	struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue);
-
-	if (buf->error && !uvc_no_drop_param) {
-		uvc_queue_buffer_requeue(queue, buf);
-		return;
-	}
 
 	buf->state = buf->error ? UVC_BUF_STATE_ERROR : UVC_BUF_STATE_DONE;
 	vb2_set_plane_payload(&buf->buf.vb2_buf, 0, buf->bytesused);
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index ed7bad31f75ca474c1037d666d5310c78dd764df..9a86d7f1f6ea022dace87614030bf0fde0d260f0 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -659,7 +659,6 @@ static inline struct uvc_fh *to_uvc_fh(struct file *filp)
 #define UVC_WARN_XU_GET_RES	2
 
 extern unsigned int uvc_clock_param;
-extern unsigned int uvc_no_drop_param;
 extern unsigned int uvc_dbg_param;
 extern unsigned int uvc_timeout_param;
 extern unsigned int uvc_hw_timestamps_param;

-- 
2.52.0.rc1.455.g30608eb744-goog