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

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Message-ID: <55EDADF5.5060008@arm.com>
Date:	Mon, 07 Sep 2015 16:32:05 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	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

Hi Al,

On 19/08/15 23:07, Al Stone wrote:

I finally got a chance to try this series on Juno. Well it exposed a 
firmware bug in MADT table :)

[..]

>                  acpi_tbl_entry_handler handler,
> @@ -245,6 +484,8 @@ acpi_parse_entries(char *id, unsigned long table_size,
>                 table_end) {
>                  if (entry->type == entry_id
>                      && (!max_entries || count < max_entries)) {
> +                       if (bad_madt_entry(table_header, entry))
> +                               return -EINVAL;

Not sure if we can have the above check here unconditionally.
Currently I can see there are 2 other users of acpi_parse_entries i.e.
PCC and NUMA. So may be it can be made conditional or return success for
non-MADT tables from bad_madt_entry ?

Other than that, you can add for ARM64 specific parts:
Reviewed-and-tested-by: Sudeep Holla <sudeep.holla@....com>

Regards,
Sudeep
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