linux-kernel - Re: [PATCH V8 7/9] vfio, platform: make reset driver a requirement by default

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Date:	Wed, 13 Jul 2016 15:18:47 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Sinan Kaya <okaya@...eaurora.org>
Cc:	kvm@...r.kernel.org, timur@...eaurora.org, cov@...eaurora.org,
	jcm@...hat.com, eric.auger@...hat.com, linux-acpi@...r.kernel.org,
	agross@...eaurora.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Baptiste Reynal <b.reynal@...tualopensystems.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V8 7/9] vfio, platform: make reset driver a requirement
 by default

On Wed, 13 Jul 2016 16:48:32 -0400
Sinan Kaya <okaya@...eaurora.org> wrote:

> On 6/23/2016 2:59 PM, Alex Williamson wrote:
> >> -static void vfio_platform_get_reset(struct vfio_platform_device *vdev)  
> >> > +static int vfio_platform_get_reset(struct vfio_platform_device *vdev)
> >> >  {
> >> >  	if (vdev->acpihid)
> >> > -		return;
> >> > +		return vfio_platform_acpi_has_reset(vdev) ? 0 : -ENOENT;
> >> >  
> >> >  	vdev->of_reset = vfio_platform_lookup_reset(vdev->compat,
> >> >  						    &vdev->reset_module);
> >> > @@ -140,6 +140,8 @@ static void vfio_platform_get_reset(struct vfio_platform_device *vdev)
> >> >  		vdev->of_reset = vfio_platform_lookup_reset(vdev->compat,
> >> >  							&vdev->reset_module);
> >> >  	}
> >> > +
> >> > +	return vdev->of_reset ? 0 : -ENOENT;
> >> >  }  
> > nit, this looks more like a:
> > 
> > static bool vfio_platform_has_reset(...)
> > 	...
> > 		return vfio_platform_acpi_has_reset() == 0;
> > 
> > 	...
> > 
> > 	return vdev->of_reset != NULL
> >   
> 
> Sorry, I didn't understand this comment. The code has get and put functions for DT.
> These functions are not useful for ACPI. This is the reason for the above change. 
> 
> Can you be more specific?


It was sort of cryptic, I'm not entirely sure I can make sense of it
either.  It think I was mainly suggesting that it looked more like a
bool function so we could just return true/false, but we are actually
setting the of_reset function as part of this, so there is a 'get'
aspect.  Feel free to ignore this comment.  Thanks,

Alex