Re: [PATCH v2] iio: adc: exynos: do not rely on 'users' counter in ISR

[Krzysztof Kozlowski]

On Tue, 6 Oct 2020 at 06:12, <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>
> ---
>
> v2: switched from ordinary read/write to READ_ONCE/WRITE_ONCE per Michał
> Mirosław
>
>  drivers/iio/adc/exynos_adc.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)

Acked-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx>

Best regards,
Krzysztof