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SubjectRe: [PATCH 4.19 189/276] iio: adc: ti-ads7950: Fix improper use of mlock
(stable removed from cc list)

> Indio->mlock is used for protecting the different iio device modes.
> It is currently not being used in this way. Replace the lock with
> an internal lock specifically used for protecting the SPI transfer
> buffer.
>
> Signed-off-by: Justin Chen <justinpopo6@gmail.com>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
> drivers/iio/adc/ti-ads7950.c | 19 +++++++++++++++----
> 1 file changed, 15 insertions(+), 4 deletions(-)
>

> @@ -277,6 +280,7 @@ static irqreturn_t ti_ads7950_trigger_handler(int irq, void *p)
> struct ti_ads7950_state *st = iio_priv(indio_dev);
> int ret;
>
> + mutex_lock(&st->slock);
> ret = spi_sync(st->spi, &st->ring_msg);
> if (ret < 0)
> goto out;
> @@ -285,6 +289,7 @@ static irqreturn_t ti_ads7950_trigger_handler(int irq, void *p)
> iio_get_time_ns(indio_dev));
>
> out:
> + mutex_unlock(&st->slock);
> iio_trigger_notify_done(indio_dev->trig);
>
> return IRQ_HANDLED;

Does trigger_handler run from interrupt context? Prototype suggests
so... If so, it can not really take mutexes...

Best regards,
Pavel

--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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