[PATCH 07/11] tpm: Reduce duplication in a few functions

[Ilias Apalodimas <ilias.apalodimas@linaro.org>]

Hi Simon, 

On Sat, Jan 16, 2021 at 02:51:34PM -0700, Simon Glass wrote:
> Update tpm2_clear() and tpm2_pcr_extend() so that the command size
> is not repeated twice. Add a small comment to the latter.
> 
> Signed-off-by: Simon Glass <sjg@chromium.org>
> ---
> 
>  lib/tpm-v2.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c
> index 1f3deb06e48..b148081afd7 100644
> --- a/lib/tpm-v2.c
> +++ b/lib/tpm-v2.c
> @@ -47,9 +47,10 @@ u32 tpm2_self_test(struct udevice *dev, enum tpm2_yes_no full_test)
>  u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw,
>  	       const ssize_t pw_sz)
>  {
> +	uint offset = 27;

I know this was a pre-existing problem, but a comment explaining the 'magic'
offsets, or a link to the relevant documentation would come in handy.

>  	u8 command_v2[COMMAND_BUFFER_SIZE] = {
>  	 */

[...]

>  	ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
>  			       offset, digest, digest_len);
> -	offset += digest_len;

This is removed because offset is not used after the calculation, right?

>  	if (ret)
>  		return TPM_LIB_ERROR;
>  
> -- 
> 2.30.0.284.gd98b1dd5eaa7-goog
>