| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 032/152] iio: dac: ad5592r: fix unbalanced mutex unlocks in ad5592r_read_raw() | Date | Thu, 20 Aug 2020 11:19:59 +0200 |
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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 @@ -416,7 +416,7 @@ 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; @@ -447,7 +447,7 @@ static int ad5592r_read_raw(struct iio_d ret = IIO_VAL_INT; break; default: - ret = -EINVAL; + return -EINVAL; } unlock:
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