linux-kernel - Re: [PATCH v7 07/17] ARM64 / ACPI: Disable ACPI if FADT revision is less than 5.1

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Message-ID: <54BDC5F8.5000702@linaro.org>
Date:	Tue, 20 Jan 2015 11:05:28 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Catalin Marinas <catalin.marinas@....com>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <Mark.Rutland@....com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Will Deacon <Will.Deacon@....com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	"jcm@...hat.com" <jcm@...hat.com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	"phoenix.liyi@...wei.com" <phoenix.liyi@...wei.com>,
	Timur Tabi <timur@...eaurora.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"wangyijing@...wei.com" <wangyijing@...wei.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 v7 07/17] ARM64 / ACPI: Disable ACPI if FADT revision
 is less than 5.1

On 2015年01月19日 19:50, Catalin Marinas wrote:
> On Wed, Jan 14, 2015 at 03:04:55PM +0000, Hanjun Guo wrote:
>> --- a/arch/arm64/kernel/acpi.c
>> +++ b/arch/arm64/kernel/acpi.c
> [...]
>> @@ -64,8 +88,13 @@ void __init acpi_boot_table_init(void)
>>   		return;
>>
>>   	/* Initialize the ACPI boot-time table parser. */
>> -	if (acpi_table_init())
>> +	if (acpi_table_init()) {
>>   		disable_acpi();
>> +		return;
>> +	}
>> +
>> +	if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
>> +		pr_err("Can't find FADT or error happened during parsing FADT\n");
>>   }
>
> Do you need a disable_acpi() call here as well?

Yes, if we can not find the FADT table, we should disable ACPI, I will
update it in next version, thanks for pointing this out :)

Thanks
Hanjun
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