linux-kernel - [PATCH AUTOSEL 4.14 02/25] media: sh_vou: fix pm_runtime_get

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Message-Id: <20210704231123.1491517-2-sashal@kernel.org>
Date:   Sun,  4 Jul 2021 19:11:00 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Sasha Levin <sashal@...nel.org>, linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 02/25] media: sh_vou: fix pm_runtime_get_sync() usage count

From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>

[ Upstream commit 6e8b1526db164c9d4b9dacfb9bc48e365d7c4860 ]

The pm_runtime_get_sync() internally increments the
dev->power.usage_count without decrementing it, even on errors.
Replace it by the new pm_runtime_resume_and_get(), introduced by:
commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
in order to properly decrement the usage counter, avoiding
a potential PM usage counter leak.

While here, check if the PM runtime error was caught at open time.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/sh_vou.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/sh_vou.c b/drivers/media/platform/sh_vou.c
index 871da2a2a91c..06381c88229f 100644
--- a/drivers/media/platform/sh_vou.c
+++ b/drivers/media/platform/sh_vou.c
@@ -1147,7 +1147,11 @@ static int sh_vou_open(struct file *file)
 	if (v4l2_fh_is_singular_file(file) &&
 	    vou_dev->status == SH_VOU_INITIALISING) {
 		/* First open */
-		pm_runtime_get_sync(vou_dev->v4l2_dev.dev);
+		err = pm_runtime_resume_and_get(vou_dev->v4l2_dev.dev);
+		if (err < 0) {
+			v4l2_fh_release(file);
+			goto done_open;
+		}
 		err = sh_vou_hw_init(vou_dev);
 		if (err < 0) {
 			pm_runtime_put(vou_dev->v4l2_dev.dev);
-- 
2.30.2