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[35.236.236.5]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-466c407e6acsm9923421cf.52.2024.11.28.12.54.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Nov 2024 12:54:19 -0800 (PST) From: Ricardo Ribalda Date: Thu, 28 Nov 2024 20:53:42 +0000 Subject: [PATCH v5 2/2] media: uvcvideo: Add more logging to uvc_query_ctrl() Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241128-uvc-readless-v5-2-cf16ed282af8@chromium.org> References: <20241128-uvc-readless-v5-0-cf16ed282af8@chromium.org> In-Reply-To: <20241128-uvc-readless-v5-0-cf16ed282af8@chromium.org> To: Laurent Pinchart , Hans de Goede , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Ricardo Ribalda , Sakari Ailus X-Mailer: b4 0.13.0 If we fail to query the ctrl error code there is no information on dmesg or in uvc_dbg. This makes difficult to debug the issue. Print a proper error message when we cannot retrieve the error code from the device. Reviewed-by: Hans de Goede Signed-off-by: Ricardo Ribalda --- drivers/media/usb/uvc/uvc_video.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index 67f714bca417..a650d886e922 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -117,8 +117,12 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit, error = *(u8 *)data; *(u8 *)data = tmp; - if (ret != 1) + if (ret != 1) { + dev_err_ratelimited(&dev->udev->dev, + "Failed to query (%s) UVC error code control %u on unit %u: %d (exp. 1).\n", + uvc_query_name(query), cs, unit, ret); return ret < 0 ? ret : -EPIPE; + } uvc_dbg(dev, CONTROL, "Control error %u\n", error);