linux-kernel - Re: [PATCH V2 1/9] acpi: apei: read ack upon ghes record consumption

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Message-ID: <570574D8.8060402@codeaurora.org>
Date:	Wed, 6 Apr 2016 14:43:04 -0600
From:	"Baicar, Tyler" <tbaicar@...eaurora.org>
To:	Suzuki K Poulose <Suzuki.Poulose@....com>, fu.wei@...aro.org,
	timur@...eaurora.org, harba@...eaurora.org,
	rruigrok@...eaurora.org, ahs3@...hat.com, catalin.marinas@....com,
	will.deacon@....com, rjw@...ysocki.net, lenb@...nel.org,
	matt@...eblueprint.co.uk, robert.moore@...el.com,
	lv.zheng@...el.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-efi@...r.kernel.org, devel@...ica.org
Cc:	"Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>,
	Naveen Kaje <nkaje@...eaurora.org>
Subject: Re: [PATCH V2 1/9] acpi: apei: read ack upon ghes record consumption

Hello Suzuki,

On 4/6/2016 9:53 AM, Suzuki K Poulose wrote:
> On 06/04/16 16:12, Tyler Baicar wrote:
>> +    hest_hdr = (struct acpi_hest_header *)generic;
>> +    if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2) {
>> +        ghes->generic_v2 = (struct acpi_hest_generic_v2 *)generic;
>> +        rc = apei_map_generic_address(
>> +            &ghes->generic_v2->read_ack_register);
>> +        if (rc)
>> +            goto err_unmap;
>> +    } else
>> +        ghes->generic_v2 = NULL;
> ...
>>   err_unmap:
>> apei_unmap_generic_address(&generic->error_status_address);
>> +    if (ghes->generic_v2)
>> +        apei_unmap_generic_address(
>> +            &ghes->generic_v2->read_ack_register);
>>   err_free:
>>       kfree(ghes);
>>       return ERR_PTR(rc);
>> @@ -279,6 +295,9 @@ static void ghes_fini(struct ghes *ghes)
>>   {
>>       kfree(ghes->estatus);
>> apei_unmap_generic_address(&ghes->generic->error_status_address);
>> +    if (ghes->generic_v2)
>> +        apei_unmap_generic_address(
>> +            &ghes->generic_v2->error_status_address);
>
> I am not familiar with the APEI code, but is this error_status_address or
> read_ack_register ? We don't seem to be mapping error_status_address 
> in generic_v2 header
> which is introduced in this patch ? Am I missing something ?
>
> Suzuki

Thank you for your feedback. This does look like an error; it should be 
&ghes->generic_v2->read_ack_register. The variable 
&ghes->generic_v2->error_status_address is the same as 
&ghes->generic->error_status_address which is unmapped on the line above 
the if statement here.

Thanks,
Tyler

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