linux-kernel - Re: [PATCH] PCI, ACPI: Don't query OSC support with all possible controls

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Date:	Sat, 30 Mar 2013 02:12:29 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Len Brown <len.brown@...el.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI, ACPI: Don't query OSC support with all possible controls

On Friday, March 29, 2013 06:02:45 PM Yinghai Lu wrote:
> On Fri, Mar 29, 2013 at 5:36 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> >> -             /* Run _OSC query for all possible controls. */
> >> -             capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
> >> +             /* Run _OSC query only with existing controls. */
> >> +             capbuf[OSC_CONTROL_TYPE] = root->osc_control_set;
> >
> > I suppose we can do that, but then why this should be root->osc_control_set and
> > not just 0?
> 
> in case query support and set control are called in mixed sequence.

OK, that's a good enough reason I think.

I'm kind of afarid of regressions that may result from this, though, so I'm
going to queue it up for 3.10.

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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