linux-kernel - Re: [PATCH 1/3] tpm: of: Handle IBM,vtpm20 case when getting log parameters

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Message-ID: <1699b8ee-34d3-1dfd-7102-7dd1b7f6b641@linux.vnet.ibm.com>
Date:   Thu, 13 Feb 2020 12:46:36 -0500
From:   Nayna <nayna@...ux.vnet.ibm.com>
To:     Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        linux-integrity@...r.kernel.org
Cc:     aik@...abs.ru, david@...son.dropbear.id.au,
        linux-kernel@...r.kernel.org, gcwilson@...ux.ibm.com,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: Re: [PATCH 1/3] tpm: of: Handle IBM,vtpm20 case when getting log
 parameters


On 2/4/20 8:27 AM, Stefan Berger wrote:
> From: Stefan Berger <stefanb@...ux.ibm.com>
>
> A vTPM 2.0 is identified by 'IBM,vtpm20' in the 'compatible' node in
> the device tree. Handle it in the same way as 'IBM,vtpm'.
>
> The vTPM 2.0's log is written in little endian format so that for this
> aspect we can rely on existing code.
>
> Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
> ---
>   drivers/char/tpm/eventlog/of.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/char/tpm/eventlog/of.c b/drivers/char/tpm/eventlog/of.c
> index af347c190819..a9ce66d09a75 100644
> --- a/drivers/char/tpm/eventlog/of.c
> +++ b/drivers/char/tpm/eventlog/of.c
> @@ -51,7 +51,8 @@ int tpm_read_log_of(struct tpm_chip *chip)
>   	 * endian format. For this reason, vtpm doesn't need conversion
>   	 * but physical tpm needs the conversion.
>   	 */
> -	if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0) {
> +	if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0 &&
> +	    of_property_match_string(np, "compatible", "IBM,vtpm20") < 0) {

How about changing this to use of_device_compatible_match() ?

Thanks & Regards,

       - Nayna