Re: [PATCH] iio: adc: exynos: do not rely on 'users' counter in ISR

[Krzysztof Kozlowski]

On Sun, Oct 04, 2020 at 10:24:20PM -0700, dmitry.torokhov@xxxxxxxxx wrote:
> The order in which 'users' counter is decremented vs calling drivers'
> close() method is implementation specific, and we should not rely on
> it. Let's introduce driver private flag and use it to signal ISR
> to exit when device is being closed.
> 
> This has a side-effect of fixing issue of accessing inut->users
> outside of input->mutex protection.
> 
> Reported-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxxxx>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> ---
>  drivers/iio/adc/exynos_adc.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)

Acked-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx>

Best regards,
Krzysztof