[alsa-devel] [RFC PATCH 17/40] soundwire: bus: use runtime_pm_get_sync/pm when enabled

[Andy Shevchenko]

On Fri, Jul 26, 2019 at 08:25:35PM +0200, Guennadi Liakhovetski wrote:
> On Fri, Jul 26, 2019 at 01:08:57PM -0500, Pierre-Louis Bossart wrote:
> > On 7/25/19 6:40 PM, Pierre-Louis Bossart wrote:
> > > Not all platforms support runtime_pm for now, let's use runtime_pm
> > > only when enabled.

> > option2 (suggested by Jan Kotas): catch the -EACCESS error code
> > 
> >  	ret = pm_runtime_get_sync(slave->bus->dev);
> > -	if (ret < 0)
> > +	if (ret < 0 && ret != -EACCES)
> >  		return ret;

> Otherwise I'd go with (2), I think, since
> that's also the official purpose of the -EACCESS return code:
> 
> https://lists.linuxfoundation.org/pipermail/linux-pm/2011-June/031930.html

And at least we have examples in the kernel

drivers/gpu/drm/radeon/radeon_fb.c:57:  if (ret < 0 && ret != -EACCES) {

-- 
With Best Regards,
Andy Shevchenko