[U-Boot] [PATCH 1/1] tee: change return code for REE FS supplicant cmd

[Jens Wiklander]

On Tue, Dec 4, 2018 at 1:37 PM Igor Opaniuk <igor.opaniuk at linaro.org> wrote:
>
> If OP-TEE core is compiled with support of REE FS and RPMB
> at the same time (CFG_RPMB_FS ?= y; CFG_RPMB_FS ?= y), and persistent
> storage API is used with TEE_STORAGE_PRIVATE storage id, it will
> lead to TA panic.
>
> E/TC:? 0 TA panicked with code 0xffff0009
> .....
> E/TC:? 0 Call stack:
> E/TC:? 0  0x000000004002f2f8 TEE_OpenPersistentObject at
> lib/libutee/tee_api_objects.c:422
>
> In this particular case TEE_ERROR_STORAGE_NOT_AVAILABLE is more suitable
> than TEE_ERROR_NOT_IMPLEMENTED, as it provides to a TA a possibility
> to handle this error code [1].
>
> From GPD TEE Internal Core specification [2]:
> TEE_ERROR_STORAGE_NOT_AVAILABLE - if the persistent object is stored in a
> storage area which is currently inaccessible. It may be associated with
> the device but unplugged, busy, or inaccessible for some other reason.
>
> [1]: https://github.com/OP-TEE/optee_os/blob/94db01ef448d1e552161c2d861d57a5f8bda0cc0/lib/libutee/tee_api_objects.c#L419
> [2]: https://globalplatform.org/wp-content/uploads/2018/06/GPD_TEE_Internal_Core_API_Specification_v1.1.2.50_PublicReview.pdf
>
> Signed-off-by: Igor Opaniuk <igor.opaniuk at linaro.org>
> ---
>  drivers/tee/optee/supplicant.c | 4 ++--
>  include/tee.h                  | 1 +
>  2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tee/optee/supplicant.c b/drivers/tee/optee/supplicant.c
> index b1ea65b..c5726ec 100644
> --- a/drivers/tee/optee/supplicant.c
> +++ b/drivers/tee/optee/supplicant.c
> @@ -82,8 +82,8 @@ void optee_suppl_cmd(struct udevice *dev, struct tee_shm *shm_arg,
>                 cmd_shm_free(arg);
>                 break;
>         case OPTEE_MSG_RPC_CMD_FS:
> -               debug("OPTEE_MSG_RPC_CMD_FS not implemented\n");
> -               arg->ret = TEE_ERROR_NOT_IMPLEMENTED;
> +               debug("REE FS storage isn't available\n");
> +               arg->ret = TEE_ERROR_STORAGE_NOT_AVAILABLE;
>                 break;
>         case OPTEE_MSG_RPC_CMD_RPMB:
>                 optee_suppl_cmd_rpmb(dev, arg);
> diff --git a/include/tee.h b/include/tee.h
> index 98b1c9c..edd9f9b 100644
> --- a/include/tee.h
> +++ b/include/tee.h
> @@ -34,6 +34,7 @@
>   * struct tee_version_data::gen_caps
>   */
>  #define TEE_SUCCESS                    0x00000000
> +#define TEE_ERROR_STORAGE_NOT_AVAILABLE        0xf0100003
>  #define TEE_ERROR_GENERIC              0xffff0000
>  #define TEE_ERROR_BAD_PARAMETERS       0xffff0006
>  #define TEE_ERROR_ITEM_NOT_FOUND       0xffff0008
> --
> 2.7.4
>

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

Thanks,
Jens