[U-Boot] [PATCH] drivers: optee: rpmb: fix returning CID to TEE

[Jens Wiklander <jens.wiklander@linaro.org>]

On Tue, Nov 26, 2019 at 05:19:34PM +0100, Jorge Ramirez-Ortiz wrote:
> The mmc CID value is one of the input parameters used to provision the
> RPMB key. The trusted execution environment expects this value to be
> specified in big endian format.
> 
> Before this fix, on little endian systems, the value returned by the
> linux kernel mmc driver differed from the one returned by u-boot.
> This meant that if linux provisioned the RPMB key, u-boot would not
> have access to the partition (and the other way around).
> 
> Signed-off-by: Jorge Ramirez-Ortiz <jorge@foundries.io>

Looks good to me:
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

Thanks,
Jens

> ---
>  drivers/tee/optee/rpmb.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/tee/optee/rpmb.c b/drivers/tee/optee/rpmb.c
> index 955155b3f8..cf1ce77e6e 100644
> --- a/drivers/tee/optee/rpmb.c
> +++ b/drivers/tee/optee/rpmb.c
> @@ -98,6 +98,7 @@ static struct mmc *get_mmc(struct optee_private *priv, int dev_id)
>  static u32 rpmb_get_dev_info(u16 dev_id, struct rpmb_dev_info *info)
>  {
>  	struct mmc *mmc = find_mmc_device(dev_id);
> +	int i;
>  
>  	if (!mmc)
>  		return TEE_ERROR_ITEM_NOT_FOUND;
> @@ -105,7 +106,9 @@ static u32 rpmb_get_dev_info(u16 dev_id, struct rpmb_dev_info *info)
>  	if (!mmc->ext_csd)
>  		return TEE_ERROR_GENERIC;
>  
> -	memcpy(info->cid, mmc->cid, sizeof(info->cid));
> +	for (i = 0; i < ARRAY_SIZE(mmc->cid); i++)
> +		((u32 *) info->cid)[i] = cpu_to_be32(mmc->cid[i]);
> +
>  	info->rel_wr_sec_c = mmc->ext_csd[222];
>  	info->rpmb_size_mult = mmc->ext_csd[168];
>  	info->ret_code = RPMB_CMD_GET_DEV_INFO_RET_OK;
> -- 
> 2.17.1
>