Re: [PATCH] iio: accel: kxsd9: Fix runtime PM error handling and scoping

[Andy Shevchenko <andriy.shevchenko@intel.com>]

On Tue, Jun 16, 2026 at 01:33:30AM +0530, Biren Pandya wrote:
> The kxsd9 driver uses pm_runtime_get_sync() in multiple places without
> checking its return value, which can lead to silent failures. It also
> relies on manual pm_runtime_put_autosuspend() calls in various return
> paths, which is prone to memory leaks if a return path is missed.
> 
> Fix the runtime PM handling by using the new scoped guards and proper
> error checking:
> - In kxsd9_write_raw() and kxsd9_read_raw(), use the scoped
>   PM_RUNTIME_ACQUIRE_IF_ENABLED_AUTOSUSPEND() macro to safely automate
>   cleanup on function return, while maintaining the behavior of
>   waking up a suspended device via pm_runtime_resume_and_get().
>   This allows us to cleanly remove all manual puts and error gotos.
> - In kxsd9_buffer_preenable(), replace pm_runtime_get_sync() with
>   pm_runtime_resume_and_get() to safely check for errors and handle
>   usage-counter unwinding on failure.
> - In kxsd9_common_remove(), replace pm_runtime_get_sync() with
>   pm_runtime_resume_and_get() and only invoke kxsd9_power_down()
>   if the resume succeeds. This prevents unbalanced regulator disable
>   warnings and bus timeouts if the device is already suspended.

...

> void kxsd9_common_remove(struct device *dev)
>  {
>  	struct iio_dev *indio_dev = dev_get_drvdata(dev);
>  	struct kxsd9_state *st = iio_priv(indio_dev);
> +	int ret;
>  
>  	iio_triggered_buffer_cleanup(indio_dev);
>  	iio_device_unregister(indio_dev);
> -	pm_runtime_get_sync(dev);
> -	pm_runtime_put_noidle(dev);
> +
> +	ret = pm_runtime_resume_and_get(dev);
>  	pm_runtime_disable(dev);
> -	kxsd9_power_down(st);

> +	if (ret >= 0) {

Use standard pattern.

> +		kxsd9_power_down(st);
> +		pm_runtime_put_noidle(dev);
> +	}
>  }

-- 
With Best Regards,
Andy Shevchenko