[PATCH 5.7 039/204] iio: dac: ad5592r: fix unbalanced mutex unlocks in ad5592r_read_raw()

Greg Kroah-Hartman
2020-08-20T13:14:53Z

From: Alexandru Ardelean <alexandru.ardelean@analog.com>

commit 65afb0932a81c1de719ceee0db0b276094b10ac8 upstream.

There are 2 exit paths where the lock isn't held, but try to unlock the
mutex when exiting. In these places we should just return from the
function.

A neater approach would be to cleanup the ad5592r_read_raw(), but that
would make this patch more difficult to backport to stable versions.

Fixes 56ca9db862bf3: ("iio: dac: Add support for the AD5592R/AD5593R ADCs/DACs")
Reported-by: Charles Stanhope <charles.stanhope@gmail.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/iio/dac/ad5592r-base.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/iio/dac/ad5592r-base.c
+++ b/drivers/iio/dac/ad5592r-base.c
@@ -415,7 +415,7 @@ static int ad5592r_read_raw(struct iio_d
s64 tmp = *val * (3767897513LL / 25LL);
*val = div_s64_rem(tmp, 1000000000LL, val2);

- ret = IIO_VAL_INT_PLUS_MICRO;
+ return IIO_VAL_INT_PLUS_MICRO;
} else {
int mult;

@@ -446,7 +446,7 @@ static int ad5592r_read_raw(struct iio_d
ret = IIO_VAL_INT;
break;
default:
- ret = -EINVAL;
+ return -EINVAL;
}