linux-kernel - Re: [PATCH] ACPI: Use ACPI companion to match only the first physical device

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Date:	Fri, 24 Oct 2014 21:16:56 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Lee Jones <lee.jones@...aro.org>,
	Darren Hart <dvhart@...ux.intel.com>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI: Use ACPI companion to match only the first
 physical device

On Fri, Oct 24, 2014 at 04:57:17PM +0200, Rafael J. Wysocki wrote:
> > I didn't consider that it is even possible but yes, in that case we
> > should not return true here.
> 
> Well, that why did you check if the list is not empty at all? :-)
> 
> It is possible if someone sets the ACPI companion before calling acpi_bind_one()
> (some pieces of code do that).  It may not be relevant here, but it won't hurt
> to be on the safe side.

Agreed.

> > > 
> > > > +	mutex_lock(&adev->physical_node_lock);
> > > > +	if (!list_empty(&adev->physical_node_list)) {
> > > > +		const struct acpi_device_physical_node *node;
> > > > +
> > > > +		node = list_first_entry(&adev->physical_node_list,
> > > > +					struct acpi_device_physical_node, node);
> > > > +		if (node->dev != dev)
> > > > +			ret = false;
> > > 
> > > And that may be simply
> > > 
> > > 		ret = node->dev == dev;
> > 
> > OK.
> 
> So what about the following modified version?

Looks good to me, thanks :-)
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