linux-kernel - [PATCH 1/8] media: uvcvideo: Fix deferred probing error

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Message-Id: <20250403-uvc-orientation-v1-1-1a0cc595a62d@chromium.org>
Date: Thu, 03 Apr 2025 19:16:12 +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>, 
 Hans Verkuil <hverkuil@...all.nl>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-usb@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-gpio@...r.kernel.org, Ricardo Ribalda <ribalda@...omium.org>, 
 stable@...r.kernel.org, Douglas Anderson <dianders@...omium.org>
Subject: [PATCH 1/8] media: uvcvideo: Fix deferred probing error

uvc_gpio_parse() can return -EPROBE_DEFER when the GPIOs it depends on
have not yet been probed. This return code should be propagated to the
caller of uvc_probe() to ensure that probing is retried when the required
GPIOs become available.

Currently, this error code is incorrectly converted to -ENODEV,
causing some internal cameras to be ignored.

This commit fixes this issue by propagating the -EPROBE_DEFER error.

Cc: stable@...r.kernel.org
Fixes: 2886477ff987 ("media: uvcvideo: Implement UVC_EXT_GPIO_UNIT")
Reviewed-by: Douglas Anderson <dianders@...omium.org>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_driver.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 107e0fafd80f54ec98c9657e5d58d17a6ed8c02f..25e9aea81196e0eddba6de74951a46a97ae0bdb8 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2232,13 +2232,16 @@ static int uvc_probe(struct usb_interface *intf,
 #endif
 
 	/* Parse the Video Class control descriptor. */
-	if (uvc_parse_control(dev) < 0) {
+	ret = uvc_parse_control(dev);
+	if (ret < 0) {
+		ret = -ENODEV;
 		uvc_dbg(dev, PROBE, "Unable to parse UVC descriptors\n");
 		goto error;
 	}
 
 	/* Parse the associated GPIOs. */
-	if (uvc_gpio_parse(dev) < 0) {
+	ret = uvc_gpio_parse(dev);
+	if (ret < 0) {
 		uvc_dbg(dev, PROBE, "Unable to parse UVC GPIOs\n");
 		goto error;
 	}
@@ -2264,24 +2267,32 @@ static int uvc_probe(struct usb_interface *intf,
 	}
 
 	/* Register the V4L2 device. */
-	if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)
+	ret = v4l2_device_register(&intf->dev, &dev->vdev);
+	if (ret < 0)
 		goto error;
 
 	/* Scan the device for video chains. */
-	if (uvc_scan_device(dev) < 0)
+	if (uvc_scan_device(dev) < 0) {
+		ret = -ENODEV;
 		goto error;
+	}
 
 	/* Initialize controls. */
-	if (uvc_ctrl_init_device(dev) < 0)
+	if (uvc_ctrl_init_device(dev) < 0) {
+		ret = -ENODEV;
 		goto error;
+	}
 
 	/* Register video device nodes. */
-	if (uvc_register_chains(dev) < 0)
+	if (uvc_register_chains(dev) < 0) {
+		ret = -ENODEV;
 		goto error;
+	}
 
 #ifdef CONFIG_MEDIA_CONTROLLER
 	/* Register the media device node */
-	if (media_device_register(&dev->mdev) < 0)
+	ret = media_device_register(&dev->mdev);
+	if (ret < 0)
 		goto error;
 #endif
 	/* Save our data pointer in the interface data. */
@@ -2315,7 +2326,7 @@ static int uvc_probe(struct usb_interface *intf,
 error:
 	uvc_unregister_video(dev);
 	kref_put(&dev->ref, uvc_delete);
-	return -ENODEV;
+	return ret;
 }
 
 static void uvc_disconnect(struct usb_interface *intf)

-- 
2.49.0.504.g3bcea36a83-goog