diff options
| author | Alexey Khoroshilov <khoroshilov@ispras.ru> | 2017-05-27 01:53:04 +0300 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2017-05-28 15:45:46 +0100 |
| commit | 95264c8c6a9040e84edda883dbbe9d193c41f46c (patch) | |
| tree | 2b8d34342f67f0408c0775a49da54c9460e6be90 /drivers/staging/iio | |
| parent | 3d51b956267343a65498704ada854c33c0f5e946 (diff) | |
staging: iio: ad7152: Fix deadlock in ad7152_write_raw_samp_freq()
ad7152_write_raw_samp_freq() is called by ad7152_write_raw() with
chip->state_lock held. So, there is unavoidable deadlock when
ad7152_write_raw_samp_freq() locks the mutex itself.
The patch removes unneeded locking.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Fixes: 6572389bcc11 ("staging: iio: cdc: ad7152: Implement
IIO_CHAN_INFO_SAMP_FREQ attribute")
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/staging/iio')
| -rw-r--r-- | drivers/staging/iio/cdc/ad7152.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/drivers/staging/iio/cdc/ad7152.c b/drivers/staging/iio/cdc/ad7152.c index dc6ecd824365..ff10d1f0a7e4 100644 --- a/drivers/staging/iio/cdc/ad7152.c +++ b/drivers/staging/iio/cdc/ad7152.c @@ -231,16 +231,12 @@ static int ad7152_write_raw_samp_freq(struct device *dev, int val) if (i >= ARRAY_SIZE(ad7152_filter_rate_table)) i = ARRAY_SIZE(ad7152_filter_rate_table) - 1; - mutex_lock(&chip->state_lock); ret = i2c_smbus_write_byte_data(chip->client, AD7152_REG_CFG2, AD7152_CFG2_OSR(i)); - if (ret < 0) { - mutex_unlock(&chip->state_lock); + if (ret < 0) return ret; - } chip->filter_rate_setup = i; - mutex_unlock(&chip->state_lock); return ret; } |