Re: [PATCH RESEND v5 4/6] iio: accel: mma8452: Support interrupt sharing

[Andy Shevchenko]

On Wed, Aug 19, 2026 at 10:15:31AM +0200, Esben Haabendal wrote:
> Adding handling of rutnime PM suspension in the interrupt handler allows
> sharing interrupt with other devices.
> 
> Keep in mind that the device by default is using push-pull for the irq pin,
> which might require additional hardware design to allow interrupt sharing.
> 
> The suspended flag is added together with synchronize_irq() in order to
> protect against race conditions when doing runtime suspend and device
> removal. This way we ensure that interrupt handler does not try to access
> the device while regulators are disabled.

...

> +	pm_status = pm_runtime_get_if_active(&data->client->dev);
> +	if (pm_status == 0 || READ_ONCE(data->suspended))
> +		return IRQ_NONE; /* device is powered down or being removed */

This way it won't work (if pm_status != 0, you need to act accordingly).
You need to split this:

	if (READ_ONCE(data->suspended))
		return IRQ_NONE; /* device is being removed */

	pm_status = pm_runtime_get_if_active(&data->client->dev);
	if (pm_status == 0)
		return IRQ_NONE; /* device is powered down */

But I'm not sure this will work as expected.

...

> +out:

out_runtime_put:

Hint: Always name labels as an answer to the Q:
'What will happen if I goto $LABEL?'.

> +	if (pm_status > 0)
> +		pm_runtime_put_autosuspend(&data->client->dev);

-- 
With Best Regards,
Andy Shevchenko