linux-kernel - Re: [PATCH] acpi_pm: Clear pmtmr_ioport if acpi

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Date:	Fri, 21 Jan 2011 09:50:08 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	John Stultz <johnstul@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] acpi_pm: Clear pmtmr_ioport if acpi_pm initialization
 fails

On Fri, Jan 14, 2011 at 09:47:26AM -0800, John Stultz wrote:
> From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> 

tgl,

Are you OK pushing this up to Linus or should I do it? We can
also delay this till the next merge window as the other fix
that John proposed solves the bootup issue so it is not that urgent.

> If the acpi pm timer throws invalid data, clear pmtmr_ioport
> so the pm timer won't accidentally be used.
> 
> This was found when using Xen where there is a acpi pm reported,
> but gives bogus values, and other code was continuing to try
> to use the pm timer after the initialization failed.
> 
> [jstultz: Catch additional failure and reword changelog message. ]

Thank you John.

> 
> CC: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> CC: Thomas Gleixner <tglx@...utronix.de>
> Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Signed-off-by: John Stultz <johnstul@...ibm.com>
> ---
>  drivers/clocksource/acpi_pm.c |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c
> index cfb0f52..effe797 100644
> --- a/drivers/clocksource/acpi_pm.c
> +++ b/drivers/clocksource/acpi_pm.c
> @@ -202,17 +202,21 @@ static int __init init_acpi_pm_clocksource(void)
>  			printk(KERN_INFO "PM-Timer had inconsistent results:"
>  			       " 0x%#llx, 0x%#llx - aborting.\n",
>  			       value1, value2);
> +			pmtmr_ioport = 0;
>  			return -EINVAL;
>  		}
>  		if (i == ACPI_PM_READ_CHECKS) {
>  			printk(KERN_INFO "PM-Timer failed consistency check "
>  			       " (0x%#llx) - aborting.\n", value1);
> +			pmtmr_ioport = 0;
>  			return -ENODEV;
>  		}
>  	}
>  
> -	if (verify_pmtmr_rate() != 0)
> +	if (verify_pmtmr_rate() != 0){
> +		pmtmr_ioport = 0;
>  		return -ENODEV;
> +	}
>  
>  	return clocksource_register_hz(&clocksource_acpi_pm,
>  						PMTMR_TICKS_PER_SEC);
> -- 
> 1.7.3.2.146.gca209
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