linux-kernel - Re: [PATCH] platform/x86/intel/pmt: Ignore uninitialized entries

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Date:   Thu, 13 Apr 2023 13:13:09 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     "David E. Box" <david.e.box@...ux.intel.com>
cc:     hdegoede@...hat.com, markgross@...nel.org,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86/intel/pmt: Ignore uninitialized entries

On Wed, 12 Apr 2023, David E. Box wrote:

> On Intel Xeon, unused PMT regions will have uninitialized discovery headers
> containing all 0xF. Instead of returning an error, just skip the region.
> 
> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> ---
>  drivers/platform/x86/intel/pmt/telemetry.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/intel/pmt/telemetry.c b/drivers/platform/x86/intel/pmt/telemetry.c
> index 71cdef42084a..39cbc87cc28a 100644
> --- a/drivers/platform/x86/intel/pmt/telemetry.c
> +++ b/drivers/platform/x86/intel/pmt/telemetry.c
> @@ -78,7 +78,7 @@ static int pmt_telem_header_decode(struct intel_pmt_entry *entry,
>  	 * reserved for future use. They have zero size. Do not fail
>  	 * probe for these. Just ignore them.
>  	 */
> -	if (header->size == 0)
> +	if (header->size == 0 || header->access_type == 0xF)
>  		return 1;
>  
>  	return 0;

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>


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 i.