linux-kernel - Re: [Bug #12162] Commit 7cd5b08be3 breaks startup on Toshiba Portege R500

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Date:	Thu, 4 Dec 2008 09:05:37 +0100
From:	Wim Van Sebroeck <wim@...ana.be>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Frans Pop <elendil@...net.nl>
Subject: Re: [Bug #12162] Commit 7cd5b08be3 breaks startup on Toshiba Portege R500

Hi All,

I will test the watchdog part tonight on an ICH4 and ICH9 chipset.
I indeed moved the code over from the supermicro_old_pre_stop code.
And I'm sure this fix indeed needs to go in.

Kind regards,
Wim.

> 
> Rafael, I'm assuming my one-liner patch fixes your problem too, since you 
> attached the patch to the bugzilla entry. So I committed it as such. But 
> if it doesn't, we'll need to do something else.
> 
> The commit ended up being as appended..
> 
> 		Linus
> ---
> From: Linus Torvalds <torvalds@...ux-foundation.org>
> Date: Wed, 3 Dec 2008 16:20:19 -0800
> Subject: [PATCH] iTCO_wdt: fix typo when setting TCO_EN bit
> 
> The code used '&= 0x00002000' when it tried to set the TCO_EN bit, which
> obviously didn't set that bit at all, but instead just reset all the
> other bits in the SMI_EN register.
> 
> This bug seemingly caused various random behavior, with Frans Pop
> reporting that X.org just silently hung at startup and Rafael Wysocki
> reports the fan spinning with full speed.
> 
> See
> 	http://lkml.org/lkml/2008/12/3/178
> 	http://bugzilla.kernel.org/show_bug.cgi?id=12162
> 
> The problem seems to have been triggered by "[WATCHDOG] iTCO_wdt :
> problem with rebooting on new ICH9 based motherboards" (commit
> 7cd5b08be3c489df11b559fef210b81133764ad4), but the bogus code existed
> before that too (in the "supermicro_old_pre_stop()" function), it just
> apparently never showed up due to different logic.
> 
> In that commit the broken code got moved around and now gets executed
> much more.
> 
> Reported-by: Rafael J. Wysocki <rjw@...k.pl>
> Tested-by: Frans Pop <elendil@...net.nl>
> Cc: Wim Van Sebroeck <wim@...ana.be>
> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
> ---
>  drivers/watchdog/iTCO_wdt.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
> index 26173a2..5b395a4 100644
> --- a/drivers/watchdog/iTCO_wdt.c
> +++ b/drivers/watchdog/iTCO_wdt.c
> @@ -392,7 +392,7 @@ static int iTCO_wdt_stop(void)
>  
>  	/* Bit 13: TCO_EN -> 1 = Enables the TCO logic to generate SMI# */
>  	val32 = inl(SMI_EN);
> -	val32 &= 0x00002000;
> +	val32 |= 0x00002000;
>  	outl(val32, SMI_EN);
>  
>  	/* Set the NO_REBOOT bit to prevent later reboots, just for sure */
--
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