linux-kernel - Re: [Resend][PATCH] ACPI / PM: Do not power manage devices in unknown initial states

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <4672880.xWXfp5ko1N@al>
Date:	Sat, 09 Mar 2013 13:09:20 +0100
From:	Peter Wu <lekensteyn@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [Resend][PATCH] ACPI / PM: Do not power manage devices in unknown initial states

On Friday 01 February 2013 22:44:55 Rafael J. Wysocki wrote:
> On Friday, February 01, 2013 07:23:52 PM Peter Wu wrote:
> > On Thursday 31 January 2013 23:32:40 Rafael J. Wysocki wrote:
> > > In general, for ACPI device power management to work, the initial
> > > power states of devices must be known (otherwise, we wouldn't be able
> > > to keep track of power resources, for example).  Hence, if it is
> > > impossible to determine the initial ACPI power states of some
> > > devices, they can't be regarded as power-manageable using ACPI.
> > >
> > > 
> > >
> > > For this reason, modify acpi_bus_get_power_flags() to clear the
> > > power_manageable flag if acpi_bus_init_power() fails and add some
> > > extra fallback code to acpi_bus_init_power() to cover broken
> > > BIOSes that provide _PS0/_PS3 without _PSC for some devices.
> > >
> > > 
> > >
> > > Verified to work on my HP nx6325 that has this problem.
> > >
> > > 
> > >
> > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >
> > 
> >
> > Tested-by: Peter Wu <lekensteyn@...il.com>
> >
> > 
> >
> > I applied it on top of branch linux-next of repo linux-pm.
> >
> > 
> >
> > Fixes the issue I had with bbswitch in Linux 3.8. Can a backport patch be
> > made  available for 3.8?
> 
> Yes, after this commit enters the mainline.  Please ping me some time around
> 3.9-rc1.

This patch does not apply on 3.8.2, any suggestions?

Regards,
Peter
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/