linux-kernel - Re: [PATCH] ACPI/Sleep: pm_power_off need more sanity check to be installed

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Date:	Fri, 28 Feb 2014 13:33:31 +0800
From:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Len.Brown@...el.com, "alan@...ux.intel.com" <alan@...ux.intel.com>,
	"Raj, Ashok" <ashok.raj@...el.com>
Subject: Re: [PATCH] ACPI/Sleep: pm_power_off need more sanity check to be
 installed

On 2014/2/27 7:50, Rafael J. Wysocki wrote:
> On Wednesday, February 26, 2014 10:46:37 AM Li, Aubrey wrote:
>> Sleep control and status registers need santity check before ACPI
>> install acpi_power_off to pm_power_off hook. The checking code in
>> acpi_enter_sleep_state() is too late, we should not allow a not-working
>> pm_power_off function hooked.
>>
>> Signed-off-by: Aubrey Li <aubrey.li@...el.com>
>> ---
>>  drivers/acpi/sleep.c |    7 +++++--
>>  1 file changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
>> index b718806..0284d22 100644
>> --- a/drivers/acpi/sleep.c
>> +++ b/drivers/acpi/sleep.c
>> @@ -809,8 +809,11 @@ int __init acpi_sleep_init(void)
>>  	status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
>>  	if (ACPI_SUCCESS(status)) {
>>  		sleep_states[ACPI_STATE_S5] = 1;
> 
> Do we still want to set this if the check below fails?  If so, then why?

We know \_S5_ is valid. The fault is sleep registers, not S5 ACPI object

Thanks,
-Aubrey

> 
>> -		pm_power_off_prepare = acpi_power_off_prepare;
>> -		pm_power_off = acpi_power_off;
>> +		if (acpi_gbl_FADT.sleep_control.address &&
>> +			acpi_gbl_FADT.sleep_status.address) {
>> +			pm_power_off_prepare = acpi_power_off_prepare;
>> +			pm_power_off = acpi_power_off;
>> +		}
>>  	}
>>
>>  	supported[0] = 0;
>>
> 

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