linux-kernel - [PATCH] iio: cros_ec_accel_legacy: Always release lock when returning from

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Message-Id: <20190715191017.98488-1-mka@chromium.org>
Date:   Mon, 15 Jul 2019 12:10:17 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Gwendal Grignou <gwendal@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH] iio: cros_ec_accel_legacy: Always release lock when returning from _read()

Before doing any actual work cros_ec_accel_legacy_read() acquires
a mutex, which is released at the end of the function. However for
'calibbias' channels the function returns directly, without releasing
the lock. The next attempt to acquire the lock blocks forever. Instead
of an explicit return statement use the common return path, which
releases the lock.

Fixes: 11b86c7004ef1 ("platform/chrome: Add cros_ec_accel_legacy driver")
Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---
 drivers/iio/accel/cros_ec_accel_legacy.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/accel/cros_ec_accel_legacy.c b/drivers/iio/accel/cros_ec_accel_legacy.c
index 46bb2e421bb9..27ca4a64dddf 100644
--- a/drivers/iio/accel/cros_ec_accel_legacy.c
+++ b/drivers/iio/accel/cros_ec_accel_legacy.c
@@ -206,7 +206,8 @@ static int cros_ec_accel_legacy_read(struct iio_dev *indio_dev,
 	case IIO_CHAN_INFO_CALIBBIAS:
 		/* Calibration not supported. */
 		*val = 0;
-		return IIO_VAL_INT;
+		ret = IIO_VAL_INT;
+		break;
 	default:
 		return -EINVAL;
 	}
-- 
2.22.0.510.g264f2c817a-goog