linux-kernel - Re: pm runtime and system suspend resume

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: <Pine.LNX.4.44L0.1206211025060.1164-100000@iolanthe.rowland.org>
Date:	Thu, 21 Jun 2012 10:27:46 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	chao xie <xiechao.linux@...il.com>
cc:	linux-pm@...r.kernel.org, <linux-kernel@...r.kernel.org>,
	<rjw@...k.pl>, <pavel@....cz>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: pm runtime and system suspend resume

On Thu, 21 Jun 2012, chao xie wrote:

> I check the code, __device_suspend will invoke dev->pm_domain->ops
> first if dev->pm_domain is not NULL.
> Taking "suspend" as esample, i can do the following things in the
> dev->pm_domain->ops->suspend
> 1. invoke dev->driver->pm->suspend for suspending the device
> 2. do what we do in dev->pm_domain->ops->runtime_suspend for
> suspending the surrounded logic, for example, shutdown the phy or
> clocks.
> So is above implementation fine?

Yes, that sounds like it will work.  Watch out for the case where your 
device is already runtime-suspended when a system suspend occurs.

Have you read section 6 in Documentation/power/runtime_pm.txt?  It is 
related to your question.

Alan Stern

--
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/