linux-kernel - Re: [Update][PATCH 6/10] PM / Domains: System-wide transitions support for generic domains (v5)

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

Message-ID: <871uy1d380.fsf@ti.com>
Date:	Thu, 07 Jul 2011 17:29:35 -0700
From:	Kevin Hilman <khilman@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	Magnus Damm <magnus.damm@...il.com>,
	Paul Walmsley <paul@...an.com>,
	Alan Stern <stern@...land.harvard.edu>,
	LKML <linux-kernel@...r.kernel.org>, linux-sh@...r.kernel.org,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [Update][PATCH 6/10] PM / Domains: System-wide transitions support for generic domains (v5)

"Rafael J. Wysocki" <rjw@...k.pl> writes:

> From: Rafael J. Wysocki <rjw@...k.pl>
>
> Make generic PM domains support system-wide power transitions
> (system suspend and hibernation).  Add suspend, resume, freeze, thaw,
> poweroff and restore callbacks to be associated with struct
> generic_pm_domain objects and make pm_genpd_init() use them as
> appropriate.
>
> The new callbacks do nothing for devices belonging to power domains
> that were powered down at run time (before the transition).  

Thinking about this some more, how is a driver supposed to reconfigure
wakeups during suspend if it has already been runtime suspended?

For example, assume a device where device_may_wakeup() == false.  This
means wakeups during *suspend* are disabled, but wakeups wakeups are
assumed to enabled when it is runtime suspended.

So now, assume this device is RPM_SUSPENDED, it has wakeups *enabled*,
and then system suspend comes along.  

With this current patch, the driver will never receive any callbacks, so
it can never disable its wakeups.  

Am I missing something?

Kevin
--
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/