linux-kernel - [PATCH] media: uvcvideo: Shorten the transfer size non compliance message

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Message-ID: <20250904081429.592e439f.michal.pecio@gmail.com>
Date: Thu, 4 Sep 2025 08:14:29 +0200
From: Michal Pecio <michal.pecio@...il.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, Hans de Goede
 <hansg@...nel.org>, Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: uvcvideo: Shorten the transfer size non compliance
 message

This message is much longer than others and doesn't fit even in a 160
column window when printed, despite providing little real information.

Also replace 'transmission' with 'transfer' because that's the actual
name and 'max packet' with 'limit' because it isn't same thing with
isochronus endpoints. Remove cryptic abbreviations like 'ep'.

Signed-off-by: Michal Pecio <michal.pecio@...il.com>
---

By the way, this hack doesn't help much in the opposite case:
dwMaxPayloadTransferSize is right, but EP descriptors are a mess.

But no harm in trying, I guess.
I can live with it either way.


 drivers/media/usb/uvc/uvc_video.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index 82d9d8ae059d..baf4ace41dbe 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -266,7 +266,7 @@ static void uvc_fixup_video_ctrl(struct uvc_streaming *stream,
 	if (stream->intf->num_altsetting > 1 &&
 	    ctrl->dwMaxPayloadTransferSize > stream->maxpsize) {
 		dev_warn_ratelimited(&stream->intf->dev,
-				     "UVC non compliance: the max payload transmission size (%u) exceeds the size of the ep max packet (%u). Using the max size.\n",
+				     "UVC non compliance: Reducing max payload transfer size (%u) to fit endpoint limit (%u).\n",
 				     ctrl->dwMaxPayloadTransferSize,
 				     stream->maxpsize);
 		ctrl->dwMaxPayloadTransferSize = stream->maxpsize;
-- 
2.48.1