[PATCH] media: rockchip: rkcif: Use IS_ERR() check for media_entity_remote_source_pad_unique()

[Jang Ingyu]

From: Ingyu Jang <ingyujang25@xxxxxxxxxxx>

media_entity_remote_source_pad_unique() returns either a valid struct
media_pad pointer or an error pointer (ERR_PTR(-ENOTUNIQ) or
ERR_PTR(-ENOLINK)); it never returns NULL. The current NULL check
therefore never triggers, and the "pad not connected" error path is
unreachable.

Replace the NULL check with an IS_ERR() check so the validation
actually detects malformed media graphs.

Signed-off-by: Ingyu Jang <ingyujang25@xxxxxxxxxxx>
---
 drivers/media/platform/rockchip/rkcif/rkcif-stream.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/rockchip/rkcif/rkcif-stream.c b/drivers/media/platform/rockchip/rkcif/rkcif-stream.c
index 3130d420ad559..542aa877919df 100644
--- a/drivers/media/platform/rockchip/rkcif/rkcif-stream.c
+++ b/drivers/media/platform/rockchip/rkcif/rkcif-stream.c
@@ -466,7 +466,7 @@ static int rkcif_stream_link_validate(struct media_link *link)
 	struct rkcif_stream *stream = to_rkcif_stream(vdev);
 	int ret = -EINVAL;
 
-	if (!media_entity_remote_source_pad_unique(link->sink->entity))
+	if (IS_ERR(media_entity_remote_source_pad_unique(link->sink->entity)))
 		return -ENOTCONN;
 
 	sd = media_entity_to_v4l2_subdev(link->source->entity);
-- 
2.34.1