linux-kernel - Re: [PATCH] ACPI video: Ignore AE_AML_PACKAGE_LIMIT errors after

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Date:	Wed, 10 Oct 2012 04:43:40 +0400
From:	Igor Murzov <e-mail@...e.by>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-acpi@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
	Len Brown <lenb@...nel.org>, Sergey V <sftp.mtuci@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI video: Ignore AE_AML_PACKAGE_LIMIT errors after
 _DOD evaluation.

On Wed, 10 Oct 2012 00:58:10 +0200
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> On Wednesday 10 of October 2012 02:19:06 Igor Murzov wrote:
> > This should fix brightness controls on some laptops.
> > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=47861
> > 
> > Signed-off-by: Igor Murzov <e-mail@...e.by>
> 
> Put more detials into the changelog, please.  The BZ entry linked above
> may or may not be accessible when the changelog is read by someone.
> 
> > ---
> >  drivers/acpi/video.c | 8 ++++++--
> >  1 file changed, 6 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
> > index 1e0a9e1..01bb58d 100644
> > --- a/drivers/acpi/video.c
> > +++ b/drivers/acpi/video.c
> > @@ -1349,8 +1349,12 @@ acpi_video_bus_get_devices(struct acpi_video_bus *video,
> >  	struct acpi_device *dev;
> >  
> >  	status = acpi_video_device_enumerate(video);
> > -	if (status)
> > -		return status;
> > +	if (status) {
> > +		if (status == AE_AML_PACKAGE_LIMIT)
> > +			status = 0; /* Ignore this error */
> > +		else
> > +			return status;
> > +	}
> 
> First off, please add a comment explaining _why_ we're ignoring the error.

The problem is that i'm not sure if it's ok to ignore
AE_AML_PACKAGE_LIMIT here. Stefan Wilkens in bugzilla
claims that video module works fine on his Compaq 6720s
in spite of the fact that acpi_video_device_enumerate()
is not able to find any video device on his laptop.
This fix is just the most obvious one, not necessarily
the proper one.


> Second, what about adding just:
> 
> if (status == AE_AML_PACKAGE_LIMIT)
> 	status = 0;
> 
> before the "if (status)" check?

Ok

-- Igor

> >  
> >  	list_for_each_entry(dev, &device->children, node) {
> 
> Thanks,
> Rafael
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