linux-kernel - Re: [PATCH 1/4] tpm: add kdoc for tpm_transmit and tpm_transmit

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Date:   Thu, 24 Nov 2016 15:11:55 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Tomas Winkler <tomas.winkler@...el.com>
Cc:     tpmdd-devel@...ts.sourceforge.net,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] tpm: add kdoc for tpm_transmit and tpm_transmit_cmd

On Wed, Nov 16, 2016 at 07:03:38PM +0200, Tomas Winkler wrote:
> Functions tpm_transmit and transmit_cmd are referenced
> from other functions kdoc hence deserve documentation.
> 
> Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> ---
>  drivers/char/tpm/tpm-interface.c | 33 ++++++++++++++++++++++++++++-----
>  1 file changed, 28 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index a2688ac2b48f..56c238a6e005 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -328,8 +328,17 @@ unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
>  }
>  EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
>  
> -/*
> - * Internal kernel interface to transmit TPM commands
> +/**
> + * tmp_transmit - Internal kernel interface to transmit TPM commands.
> + *
> + * @chip: TPM chip to use
> + * @buf: TPM command buffer
> + * @bufsiz: length of the TPM command buffer
> + * @flags: tpm transmit flags - bitmap
> + *
> + * Return:
> + *     0 when the operation is successful
> + *     A negative number for system errors (errno)
>   */
>  ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
>  		     unsigned int flags)
> @@ -409,9 +418,21 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
>  	return rc;
>  }
>  
> -#define TPM_DIGEST_SIZE 20
> -#define TPM_RET_CODE_IDX 6
> -
> +/**
> + * tmp_transmit_cmd - send a tpm command to the device
> + *    The function extracts tpm out header return code
> + *
> + * @chip: TPM chip to use
> + * @cmd: TPM command buffer
> + * @len: length of the TPM command
> + * @flags: tpm transmit flags - bitmap
> + * @desc: command description used in the error message
> + *
> + * Return:
> + *     0 when the operation is successful
> + *     A negative number for system errors (errno)
> + *     A positive number for a TPM error.
> + */
>  ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd,
>  			 int len, unsigned int flags, const char *desc)
>  {
> @@ -434,6 +455,8 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd,
>  	return err;
>  }
>  
> +#define TPM_DIGEST_SIZE 20
> +#define TPM_RET_CODE_IDX 6

I think we should scrap this stupid constant away but its not this
patches fault :-) Would be better to just use SHA1_DIGEST_SIZE.

>  #define TPM_INTERNAL_RESULT_SIZE 200
>  #define TPM_ORD_GET_CAP cpu_to_be32(101)
>  #define TPM_ORD_GET_RANDOM cpu_to_be32(70)
> -- 
> 2.7.4

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

I'm applying this and other patches in this series post pull requeest as
it is not release critical.

/Jarkko