This is a note to let you know that I've just added the patch titled staging: iio: ad7152: Fix deadlock in ad7152_write_raw_samp_freq() to the 4.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: staging-iio-ad7152-fix-deadlock-in-ad7152_write_raw_samp_freq.patch and it can be found in the queue-4.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 95264c8c6a9040e84edda883dbbe9d193c41f46c Mon Sep 17 00:00:00 2001 From: Alexey Khoroshilov <khoroshilov@xxxxxxxxx> Date: Sat, 27 May 2017 01:53:04 +0300 Subject: staging: iio: ad7152: Fix deadlock in ad7152_write_raw_samp_freq() From: Alexey Khoroshilov <khoroshilov@xxxxxxxxx> commit 95264c8c6a9040e84edda883dbbe9d193c41f46c upstream. 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@xxxxxxxxx> Fixes: 6572389bcc11 ("staging: iio: cdc: ad7152: Implement IIO_CHAN_INFO_SAMP_FREQ attribute") Acked-by: Lars-Peter Clausen <lars@xxxxxxxxxx> Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/staging/iio/cdc/ad7152.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) --- 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(st 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; } Patches currently in stable-queue which might be from khoroshilov@xxxxxxxxx are queue-4.11/staging-iio-ad7152-fix-deadlock-in-ad7152_write_raw_samp_freq.patch