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Subject: Re: [PATCH v2 4/5] platform/x86: intel_pmt_telemetry: Ignore zero
 sized entries
To:     "David E. Box" <david.e.box@linux.intel.com>, lee.jones@linaro.org,
        mgross@linux.intel.com, bhelgaas@google.com,
        srinivas.pandruvada@intel.com, andy.shevchenko@gmail.com
Cc:     linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org,
        linux-pci@vger.kernel.org
References: <20210817224018.1013192-1-david.e.box@linux.intel.com>
 <20210817224018.1013192-5-david.e.box@linux.intel.com>
From:   Hans de Goede <hdegoede@redhat.com>
Message-ID: <c1a8e066-ef99-911c-1b82-6e8da62e935a@redhat.com>
Date:   Wed, 18 Aug 2021 09:52:05 +0200
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Hi,

On 8/18/21 12:40 AM, David E. Box wrote:
> Some devices may expose non-functioning entries that are reserved for
> future use. These entries have zero size. Ignore them during probe.
> 
> Signed-off-by: David E. Box <david.e.box@linux.intel.com>

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans


> ---
> 
> V2:	New patch
> 
>  drivers/platform/x86/intel/pmt/telemetry.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/platform/x86/intel/pmt/telemetry.c b/drivers/platform/x86/intel/pmt/telemetry.c
> index 3559f6e7b388..d93d02672679 100644
> --- a/drivers/platform/x86/intel/pmt/telemetry.c
> +++ b/drivers/platform/x86/intel/pmt/telemetry.c
> @@ -61,6 +61,14 @@ static int pmt_telem_header_decode(struct intel_pmt_entry *entry,
>  	/* Size is measured in DWORDS, but accessor returns bytes */
>  	header->size = TELEM_SIZE(readl(disc_table));
>  
> +	/*
> +	 * Some devices may expose non-functioning entries that are
> +	 * reserved for future use. They have zero size. Do not fail
> +	 * probe for these. Just ignore them.
> +	 */
> +	if (header->size == 0)
> +		return 1;
> +
>  	return 0;
>  }
>  
>