linux-kernel - Re: [PATCH] PM: Acquire device locks on suspend (rev. 3)

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Date:	Fri, 11 Jan 2008 10:07:38 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Greg KH <gregkh@...e.de>, Len Brown <lenb@...nel.org>,
	Ingo Molnar <mingo@...e.hu>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Johannes Berg <johannes@...solutions.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] PM: Acquire device locks on suspend (rev. 3)

On Fri, 11 Jan 2008, Rafael J. Wysocki wrote:

> Hi,
> 
> The patch below is intended as a replacement for
> gregkh-driver-pm-acquire-device-locks-prior-to-suspending.patch that deadlocked
> suspend and hibernation on some systems. Â The present patch contains some
> safeguards against deadlocks in the relevant cases and a mechanism to print
> warnings if a deadlock is probable.
> 
> Greetings,
> Rafael
> 
> ---
> From: Rafael J. Wysocki <rjw@...k.pl>, Alan Stern <stern@...land.harvard.edu>
> 
> This patch reorganizes the way suspend and resume notifications are
> sent to drivers.  The major changes are that now the PM core acquires
> every device semaphore before calling the methods, and calls to
> device_add() during suspends will fail, while calls to device_del()
> during suspends will block.
> 
> It also provides a way to safely remove a suspended device with the
> help of the PM core, by using the device_pm_schedule_removal() callback
> introduced specifically for this purpose, and updates two drivers (msr
> and cpuid) that need to use it.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

Signed-off-by: Alan Stern <stern@...land.harvard.edu>

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