linux-kernel - [PATCH 10/11] media: exynos4-is: Prevent duplicate call to media_pipeline

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Date:   Sat, 25 Apr 2020 19:26:49 -0700
From:   Jonathan Bakker <xc-racer2@...e.ca>
To:     kyungmin.park@...sung.com, s.nawrocki@...sung.com,
        mchehab@...nel.org, kgene@...nel.org, krzk@...nel.org,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jonathan Bakker <xc-racer2@...e.ca>
Subject: [PATCH 10/11] media: exynos4-is: Prevent duplicate call to media_pipeline_stop

media_pipeline_stop can be called from both release and streamoff,
so make sure they're both protected under the streaming flag and
not just one of them.

This probably became noticeable after commit 2a2599c66368 ("[media] media:
entity: Catch unbalanced media_pipeline_stop calls") was merged as it
added a WARN.

Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
---
 drivers/media/platform/exynos4-is/fimc-capture.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/exynos4-is/fimc-capture.c b/drivers/media/platform/exynos4-is/fimc-capture.c
index 95d4a667bffb..d3ef1268da07 100644
--- a/drivers/media/platform/exynos4-is/fimc-capture.c
+++ b/drivers/media/platform/exynos4-is/fimc-capture.c
@@ -1232,8 +1232,11 @@ static int fimc_cap_streamoff(struct file *file, void *priv,
 	if (ret < 0)
 		return ret;
 
-	media_pipeline_stop(&vc->ve.vdev.entity);
-	vc->streaming = false;
+	if (vc->streaming) {
+		media_pipeline_stop(&vc->ve.vdev.entity);
+		vc->streaming = false;
+	}
+
 	return 0;
 }
 
-- 
2.20.1