linux-kernel - Re: [PATCH v2 05/18] ARM64 / ACPI: Parse FADT table to get PSCI flags for PSCI init

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Message-ID: <53F33F7A.7030307@linaro.org>
Date:	Tue, 19 Aug 2014 20:13:46 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Mark Rutland <mark.rutland@....com>
CC:	Catalin Marinas <Catalin.Marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Will Deacon <Will.Deacon@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Lv Zheng <lv.zheng@...el.com>,
	Robert Moore <robert.moore@...el.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>
Subject: Re: [PATCH v2 05/18] ARM64 / ACPI: Parse FADT table to get PSCI flags
 for PSCI init

On 2014-8-19 19:10, Mark Rutland wrote:
>>>> @@ -47,6 +49,26 @@ void __init __acpi_unmap_table(char *map, unsigned long size)
>>>>  	early_memunmap(map, size);
>>>>  }
>>>>  
>>>> +static int __init acpi_parse_fadt(struct acpi_table_header *table)
>>>> +{
>>>> +	struct acpi_table_fadt *fadt = (struct acpi_table_fadt *)table;
>>>> +
>>>> +	/*
>>>> +	 * Revision in table header is the FADT Major version,
>>>> +	 * and there is a minor version of FADT which was introduced
>>>> +	 * by ACPI 5.1, we only deal with ACPI 5.1 or higher version
>>>> +	 * to get arm boot flags, or we will disable ACPI.
>>>> +	 */
>>>> +	if (table->revision < 5 || fadt->minor_revision < 1) {
>>>
>>> If we ever get revision 6.0, this would trigger.
>>
>> Yes, good catch, actually I already fixed that in my local git repo,
>>
>> +       if (table->revision > 5 ||
>> +           (table->revision == 5 && fadt->minor_revision >= 1)) {
>> +               return 0;
>> +       } else {
>> +               pr_info("FADT revision is %d.%d, no PSCI support, should be 5.1
>> or higher\n",
>> +                       table->revision, fadt->minor_revision);
>> +               disable_acpi();
>> +               return -EINVAL;
>> +       }
> 
> Given you return in the first path, you don't need the remaining code to
> live in an else block.

Agreed, I will update it, and move disable_acpi() outside this function and keep
it in one place as Sudeep suggested.

Thanks
Hanjun

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