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William Breathitt Gray 55f0eecdcc iio: addac: stx104: Fix race condition when converting analog-to-digital 
BugLink: https://bugs.launchpad.net/bugs/2039440

[ Upstream commit 4f9b80aefb9e2f542a49d9ec087cf5919730e1dd ]

The ADC conversion procedure requires several device I/O operations
performed in a particular sequence. If stx104_read_raw() is called
concurrently, the ADC conversion procedure could be clobbered. Prevent
such a race condition by utilizing a mutex.

Fixes: 4075a283ae ("iio: stx104: Add IIO support for the ADC channels")
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/2ae5e40eed5006ca735e4c12181a9ff5ced65547.1680790580.git.william.gray@linaro.org
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
 		2023-10-30 11:41:56 +01:00
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stx104.c iio: addac: stx104: Fix race condition when converting analog-to-digital 2023-10-30 11:41:56 +01:00