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 --- 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 deadbcea5e22..e966bdb9239f 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -2231,13 +2231,16 @@ 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; } @@ -2263,24 +2266,32 @@ 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. */ @@ -2314,7 +2325,7 @@ 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)