On Fri, 6 Dec 2024 18:28:38 +0100
Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxx> wrote:
> The ad_sigma_delta driver helper uses irq_disable_nosync(). With that
> one it is possible that the irq handler still runs after the
> irq_disable_nosync() function call returns. Also to properly synchronize
> irq disabling in the different threads proper locking is needed and
> because it's unclear if the irq handler's irq_disable_nosync() call
> comes first or the one in the enabler's error path, all code locations
> that disable the irq must check for .irq_dis first to ensure there is
> exactly one disable call per enable call.
>
> So add a spinlock to the struct ad_sigma_delta and use it to synchronize
> irq enabling and disabling. Also only act in the irq handler if the irq
> is still enabled.
>
> Fixes: af3008485ea0 ("iio:adc: Add common code for ADI Sigma Delta devices")
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxx>
