linux-kernel - Re: [PATCH V3] acpi: apei: clear error status before acknowledging the error

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Message-ID: <20170829081610.moq2dtxzz4vrbmo5@pd.tnic>
Date:   Tue, 29 Aug 2017 10:16:10 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Tyler Baicar <tbaicar@...eaurora.org>
Cc:     rjw@...ysocki.net, lenb@...nel.org, will.deacon@....com,
        james.morse@....com, bp@...e.de, shiju.jose@...wei.com,
        geliangtang@...il.com, andriy.shevchenko@...ux.intel.com,
        tony.luck@...el.com, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] acpi: apei: clear error status before acknowledging
 the error

On Mon, Aug 28, 2017 at 10:53:41AM -0600, Tyler Baicar wrote:
> Currently we acknowledge errors before clearing the error status.
> This could cause a new error to be populated by firmware in-between
> the error acknowledgment and the error status clearing which would
> cause the second error's status to be cleared without being handled.
> So, clear the error status before acknowledging the errors.
> 
> Also, make sure to acknowledge the error if the error status read
> fails.
> 
> V3: Seperate check for -ENOENT return value
> 
> V2: Only send error ack if there was an error populated
>     Remove curly braces that are no longer needed
> 
> Signed-off-by: Tyler Baicar <tbaicar@...eaurora.org>
> ---
>  drivers/acpi/apei/ghes.c | 16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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