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

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Message-ID: <1503939660.25945.127.camel@linux.intel.com>
Date:   Mon, 28 Aug 2017 20:01:00 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Tyler Baicar <tbaicar@...eaurora.org>, rjw@...ysocki.net,
        lenb@...nel.org, will.deacon@....com, james.morse@....com,
        bp@...e.de, shiju.jose@...wei.com, geliangtang@...il.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, 2017-08-28 at 10:53 -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.
> 


> +out:
> +	ghes_clear_estatus(ghes);
> +

> +	if (rc == -ENOENT)
> +		return rc;
> +


>  	/*
>  	 * GHESv2 type HEST entries introduce support for error
> acknowledgment,
>  	 * so only acknowledge the error if this support is present.
>  	 */
> 


> +	if (is_hest_type_generic_v2(ghes))

You can also do this here, like
	if (is_hest_type_generic_v2(ghes) && rc != -ENOENT)

though I left this for Rafael to choose which one is preferable.

> +		return ghes_ack_error(ghes->generic_v2);
> +


-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy