linux-kernel - Re: [RFC Patch 12/19] ACPI: Enforce stricter checks for address space descriptors

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Message-ID: <54BF0C71.5080508@linux.intel.com>
Date:	Wed, 21 Jan 2015 10:18:25 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>, Len Brown <lenb@...nel.org>,
	Tony Luck <tony.luck@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [RFC Patch 12/19] ACPI: Enforce stricter checks for address space
 descriptors

On 2015/1/21 8:45, Rafael J. Wysocki wrote:
> On Thursday, January 08, 2015 10:32:59 AM Jiang Liu wrote:
>> Enforce stricter checks for address space descriptors according to
>> ACPI spec.
> 
> So is the spec the only reason for doing this?  If so, I'd say don't.
Hi Rafael,
	Yes, it's just for spec. I will drop this patch to avoid
regressions.
Regards!
Gerry

> 
>> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
>> ---
>>  drivers/acpi/resource.c |    8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
>> index 26b47f1da523..e82149e44347 100644
>> --- a/drivers/acpi/resource.c
>> +++ b/drivers/acpi/resource.c
>> @@ -192,6 +192,14 @@ static bool acpi_decode_space(struct resource *res,
>>  	bool wp = base->info.mem.write_protect;
>>  	u64 len = addr->address_length;
>>  
>> +	/*
>> +	 * Filter out invalid descriptor according to ACPI Spec 5.0, section
>> +	 * 6.4.3.5 Address Space Resource Descriptors.
>> +	 */
>> +	if ((base->min_address_fixed != base->max_address_fixed && len) ||
>> +	    (base->min_address_fixed && base->max_address_fixed && !len))
>> +		return false;
>> +
>>  	res->start = addr->minimum;
>>  	res->end = addr->maximum;
>>  
>>
> 
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