linux-kernel - [PATCH v2 2/4] media: v4l2-dev.c: Allow driver-defined entity names

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Date:   Tue,  7 Dec 2021 01:38:38 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Nicolas Dufresne <nicolas@...fresne.ca>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        tfiga@...omium.org
Cc:     Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH v2 2/4] media: v4l2-dev.c: Allow driver-defined entity names

If the driver provides an name for an entity, use it.
This is particularly useful for drivers that export multiple video
devices for the same hardware (i.e. metadata and data).

Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/v4l2-core/v4l2-dev.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index d03ace324db0..4c00503b9349 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -832,7 +832,9 @@ static int video_register_media_controller(struct video_device *vdev)
 	}
 
 	if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) {
-		vdev->entity.name = vdev->name;
+		/* Use entity names provided by the driver, if available. */
+		if (!vdev->entity.name)
+			vdev->entity.name = vdev->name;
 
 		/* Needed just for backward compatibility with legacy MC API */
 		vdev->entity.info.dev.major = VIDEO_MAJOR;
-- 
2.34.1.400.ga245620fadb-goog