linux-kernel - [PATCH AUTOSEL 4.19 02/31] media: s5p: fix pm_runtime_get

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Message-Id: <20210704231043.1491209-2-sashal@kernel.org>
Date:   Sun,  4 Jul 2021 19:10:14 -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>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Sasha Levin <sashal@...nel.org>, linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 02/31] media: s5p: fix pm_runtime_get_sync() usage count

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

[ Upstream commit fdc34e82c0f968ac4c157bd3d8c299ebc24c9c63 ]

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
s5p_cec_adap_enable().

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
Acked-by: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/s5p-cec/s5p_cec.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/s5p-cec/s5p_cec.c b/drivers/media/platform/s5p-cec/s5p_cec.c
index 8837e2678bde..fe78292df8a6 100644
--- a/drivers/media/platform/s5p-cec/s5p_cec.c
+++ b/drivers/media/platform/s5p-cec/s5p_cec.c
@@ -39,10 +39,13 @@ MODULE_PARM_DESC(debug, "debug level (0-2)");
 
 static int s5p_cec_adap_enable(struct cec_adapter *adap, bool enable)
 {
+	int ret;
 	struct s5p_cec_dev *cec = cec_get_drvdata(adap);
 
 	if (enable) {
-		pm_runtime_get_sync(cec->dev);
+		ret = pm_runtime_resume_and_get(cec->dev);
+		if (ret < 0)
+			return ret;
 
 		s5p_cec_reset(cec);
 
-- 
2.30.2