linux-kernel - [PATCH] io: pressure: zpa2326: handle pm_runtime_get

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Message-Id: <20200605024445.35672-1-navid.emamdoost@gmail.com>
Date:   Thu,  4 Jun 2020 21:44:44 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     emamd001@....edu, wu000273@....edu, kjlu@....edu, smccaman@....edu
Subject: [PATCH] io: pressure: zpa2326: handle pm_runtime_get_sync failure

Calling pm_runtime_get_sync increments the counter even in case of
failure, causing incorrect ref count. Call pm_runtime_put if
pm_runtime_get_sync fails.

Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
 drivers/iio/pressure/zpa2326.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/pressure/zpa2326.c b/drivers/iio/pressure/zpa2326.c
index 99dfe33ee402..245f2e2d412b 100644
--- a/drivers/iio/pressure/zpa2326.c
+++ b/drivers/iio/pressure/zpa2326.c
@@ -664,8 +664,10 @@ static int zpa2326_resume(const struct iio_dev *indio_dev)
 	int err;
 
 	err = pm_runtime_get_sync(indio_dev->dev.parent);
-	if (err < 0)
+	if (err < 0) {
+		pm_runtime_put(indio_dev->dev.parent);
 		return err;
+	}
 
 	if (err > 0) {
 		/*
-- 
2.17.1