linux-kernel - Re: [PATCH v2 1/5] ACPI: add in a bad_madt_entry() function to eventually replace the macro

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Date:	Fri, 11 Sep 2015 09:49:43 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Al Stone <ahs3@...hat.com>, Al Stone <al.stone@...aro.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: [PATCH v2 1/5] ACPI: add in a bad_madt_entry() function to
 eventually replace the macro



On 10/09/15 21:43, Al Stone wrote:
> On 09/10/2015 10:20 AM, Sudeep Holla wrote:
>>

[...]

>>
>>  From the code inspection, I can see we have 3 users of acpi_parse_entries not
>> just MADT but also PCC and NUMA/SRAT
>>
>> Something like this solves this issue:
>> -              if (bad_madt_entry(table_header, entry))
>> +              if (!strncmp(id, ACPI_SIG_MADT, 4) &&
>> +                      bad_madt_entry(table_header, entry)
>>
>>
>> Or am I still missing something ?
>
> Nope, I missed it.  Your fix above will solve the problem; I misunderstood
> how acpi_parse_entries() was being used -- somehow I had it in my head that
> only MADT was in use, and just not seeing that it's being used for several
> other subtable traversals also.  Sorry about that, Sudeep.  My mistake.
>

No worries.

> I'll add this fix for a v4, but I'll wait for a few days to see if I get any
> additional comments -- I haven't heard from any x86, ia64 or ACPI maintainers

Makes sense.

> yet.  OTOH, it's nice to know we've already found and fixed two sets of arm64
> ACPI tables that are in error by using these patches, even with the flaws :).
>

Very much true indeed :)

Regards,
Sudeep
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