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@vger.kernel.org
Fixes: 2886477ff987 ("media: uvcvideo: Implement UVC_EXT_GPIO_UNIT")
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Message-ID: <20250313-uvc-eprobedefer-v3-1-a1d312708eef@chromium.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 107e0fafd80f54ec98c9657e5d58d17a6ed8c02f..25e9aea81196e0eddba6de74951a46a97ae0bdb8 100644 (file)
--- 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)