linux-kernel - [PATCH] media: uvcvideo: Fix custom control mapping probing

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Message-Id: <20240722-fix-filter-mapping-v1-1-07cc9c6bf4e3@chromium.org>
Date: Mon, 22 Jul 2024 07:59:43 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Sergey Senozhatsky <senozhatsky@...omium.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 pmenzel@...gen.mpg.de, stable@...r.kernel.org, 
 Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH] media: uvcvideo: Fix custom control mapping probing

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.

Reported-by: Paul Menzen <pmenzel@...gen.mpg.de>
Closes: https://lore.kernel.org/linux-media/518cd6b4-68a8-4895-b8fc-97d4dae1ddc4@molgen.mpg.de/T/#t
Cc: stable@...r.kernel.org
Fixes: 8f4362a8d42b ("media: uvcvideo: Allow custom control mapping")
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
Paul, could you check if this fixes your issue, thanks!
---
 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..06fede57bf36 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);
 	}
 }
 

---
base-commit: 68a72104cbcf38ad16500216e213fa4eb21c4be2
change-id: 20240722-fix-filter-mapping-18477dc69048

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