linux-kernel - [PATCH] media: ti-vpe: Fix a missing check and reference count leak

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Date:   Sat, 13 Jun 2020 21:56:05 -0500
From:   wu000273@....edu
To:     kjlu@....edu
Cc:     wu000273@....edu, Benoit Parrot <bparrot@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Archit Taneja <archit@...com>,
        Kamil Debski <k.debski@...sung.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: ti-vpe: Fix a missing check and reference count leak

From: Qiushi Wu <wu000273@....edu>

pm_runtime_get_sync() increments the runtime PM usage counter even
when it returns an error code, causing incorrect ref count if
pm_runtime_put_noidle() is not called in error handling paths.
And also, when the call of function vpe_runtime_get() failed,
we won't call vpe_runtime_put().
Thus call pm_runtime_put_noidle() if pm_runtime_get_sync() fails
inside vpe_runtime_get().

Fixes: 4571912743ac ("[media] v4l: ti-vpe: Add VPE mem to mem driver")
Signed-off-by: Qiushi Wu <wu000273@....edu>
---
 drivers/media/platform/ti-vpe/vpe.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/platform/ti-vpe/vpe.c b/drivers/media/platform/ti-vpe/vpe.c
index cff2fcd6d812..82d3ee45e2e9 100644
--- a/drivers/media/platform/ti-vpe/vpe.c
+++ b/drivers/media/platform/ti-vpe/vpe.c
@@ -2475,6 +2475,8 @@ static int vpe_runtime_get(struct platform_device *pdev)
 
 	r = pm_runtime_get_sync(&pdev->dev);
 	WARN_ON(r < 0);
+	if (r)
+		pm_runtime_put_noidle(&pdev->dev);
 	return r < 0 ? r : 0;
 }
 
-- 
2.17.1