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

[Baicar, Tyler]

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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