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Subject: media: uvcvideo: Fix custom control mapping probing Author: Ricardo Ribalda ribalda@chromium.org Date: Mon Jul 22 11:52:26 2024 +0000

Custom control mapping introduced a bug, where the filter function was applied to every single control.

Fix it so it is only applied to the matching controls.

The following dmesg errors during probe are now fixed:

usb 1-5: Found UVC 1.00 device Integrated_Webcam_HD (0c45:670c) usb 1-5: Failed to query (GET_CUR) UVC control 2 on unit 2: -75 (exp. 1). usb 1-5: Failed to query (GET_CUR) UVC control 3 on unit 2: -75 (exp. 1). usb 1-5: Failed to query (GET_CUR) UVC control 6 on unit 2: -75 (exp. 1). usb 1-5: Failed to query (GET_CUR) UVC control 7 on unit 2: -75 (exp. 1). usb 1-5: Failed to query (GET_CUR) UVC control 8 on unit 2: -75 (exp. 1). usb 1-5: Failed to query (GET_CUR) UVC control 9 on unit 2: -75 (exp. 1). usb 1-5: Failed to query (GET_CUR) UVC control 10 on unit 2: -75 (exp. 1).

Reported-by: Paul Menzel pmenzel@molgen.mpg.de Closes: https://lore.kernel.org/linux-media/518cd6b4-68a8-4895-b8fc-97d4dae1ddc4@mol... Cc: stable@vger.kernel.org Fixes: 8f4362a8d42b ("media: uvcvideo: Allow custom control mapping") Signed-off-by: Ricardo Ribalda ribalda@chromium.org Link: https://lore.kernel.org/r/20240722-fix-filter-mapping-v2-1-7ed5bb6c1185@chro... Tested-by: Paul Menzel pmenzel@molgen.mpg.de Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Signed-off-by: Laurent Pinchart laurent.pinchart@ideasonboard.com

drivers/media/usb/uvc/uvc_ctrl.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)

---

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 0136df5732ba..4fe26e82e3d1 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -2680,6 +2680,10 @@ static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain, for (i = 0; i < ARRAY_SIZE(uvc_ctrl_mappings); ++i) { const struct uvc_control_mapping *mapping = &uvc_ctrl_mappings[i];

+ if (!uvc_entity_match_guid(ctrl->entity, mapping->entity) || + ctrl->info.selector != mapping->selector) + continue; + /* Let the device provide a custom mapping. */ if (mapping->filter_mapping) { mapping = mapping->filter_mapping(chain, ctrl); @@ -2687,9 +2691,7 @@ static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain, continue; }

- if (uvc_entity_match_guid(ctrl->entity, mapping->entity) && - ctrl->info.selector == mapping->selector) - __uvc_ctrl_add_mapping(chain, ctrl, mapping); + __uvc_ctrl_add_mapping(chain, ctrl, mapping); } }