linux-kernel - Re: [bisected][bug] commit e978aa7d7d57d04eb5f88 breaks suspend on laptop.

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Message-Id: <201111120341.12473.arnd@arndb.de>
Date:	Sat, 12 Nov 2011 03:41:12 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [bisected][bug] commit e978aa7d7d57d04eb5f88 breaks suspend on laptop.

On Saturday, November 12, 2011, Rafael J. Wysocki wrote:
> If that's "acpi_idle", the appended patch should help (it works for
> me at least).

Hi Rafael,

I currently have limited email connectivity but I happened to bisect the
same bug and your patch fixes it for me. I am certainly on acpi_idle
with my thinkpad w500.

Sorry for breaking the email threading and dropping people from Cc.

> From: Rafael J. Wysocki <rjw@...k.pl>
> Subject: ACPI / cpuidle: Remove acpi_idle_suspend (to fix suspend regression)
> After commit e978aa7d7d57d04eb5f88a7507c4fb98577def77 (cpuidle: Move
> dev->last_residency update to driver enter routine; remove
> dev->last_state) setting acpi_idle_suspend to 1 by
> acpi_processor_suspend() causes the ACPI cpuidle routines to return
> error codes continuously, which in turn causes cpuidle to lock up
> (hard).  However, acpi_idle_suspend doesn't appear to be useful for
> any purpose (it's racy and doesn't really provide any real
> protection), so it can be removed, which makes the problem go away.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

Tested-by: Arnd Bergmann <arnd@...db.de>

	Arnd
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