linux-kernel - [PATCH v2] media: uvcvideo: Populate all errors in uvc

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Message-Id: <20250523-uvc-followup-v2-1-487541656e83@chromium.org>
Date: Fri, 23 May 2025 14:28:41 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Hans de Goede <hdegoede@...hat.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH v2] media: uvcvideo: Populate all errors in uvc_probe()

Now we are replacing most of the error codes with -ENODEV.
Instead, Populate the error code from the functions called by
uvc_probe().

Take this opportunity to replace a generic error code from
uvc_scan_device() into something more meaningful.

Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
CodeStyle and refactor patches after the last uvc Pull Request.
---
Changes in v2:
- Patches 1-3 will be handled by Laurent: https://lore.kernel.org/linux-media/20250523125840.GG12514@pendragon.ideasonboard.com/
- Properly propagate ret value. Sorry about that :)
- Link to v1: https://lore.kernel.org/r/20250509-uvc-followup-v1-0-73bcde30d2b5@chromium.org
---
 drivers/media/usb/uvc/uvc_driver.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index da24a655ab68cc0957762f2b67387677c22224d1..04552da114354128b0cc8fb25e1cc645498ac323 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -1866,7 +1866,7 @@ static int uvc_scan_device(struct uvc_device *dev)
 
 	if (list_empty(&dev->chains)) {
 		dev_info(&dev->udev->dev, "No valid video chain found.\n");
-		return -1;
+		return -ENODEV;
 	}
 
 	/* Add GPIO entity to the first chain. */
@@ -2239,7 +2239,6 @@ static int uvc_probe(struct usb_interface *intf,
 	/* Parse the Video Class control descriptor. */
 	ret = uvc_parse_control(dev);
 	if (ret < 0) {
-		ret = -ENODEV;
 		uvc_dbg(dev, PROBE, "Unable to parse UVC descriptors\n");
 		goto error;
 	}
@@ -2275,22 +2274,19 @@ static int uvc_probe(struct usb_interface *intf,
 		goto error;
 
 	/* Scan the device for video chains. */
-	if (uvc_scan_device(dev) < 0) {
-		ret = -ENODEV;
+	ret = uvc_scan_device(dev);
+	if (ret < 0)
 		goto error;
-	}
 
 	/* Initialize controls. */
-	if (uvc_ctrl_init_device(dev) < 0) {
-		ret = -ENODEV;
+	ret = uvc_ctrl_init_device(dev);
+	if (ret < 0)
 		goto error;
-	}
 
 	/* Register video device nodes. */
-	if (uvc_register_chains(dev) < 0) {
-		ret = -ENODEV;
+	ret = uvc_register_chains(dev);
+	if (ret < 0)
 		goto error;
-	}
 
 #ifdef CONFIG_MEDIA_CONTROLLER
 	/* Register the media device node */

---
base-commit: 5e1ff2314797bf53636468a97719a8222deca9ae
change-id: 20250509-uvc-followup-d97ff563df95

Best regards,
-- 
Ricardo Ribalda <ribalda@...omium.org>