linux-kernel - Re: [RESEND PATCH 09/11] platform/chrome: cros_ec_proto: return standard error codes for EC errors

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Date:   Wed, 13 Jul 2022 11:23:58 -0700
From:   Guenter Roeck <groeck@...gle.com>
To:     Tzung-Bi Shih <tzungbi@...nel.org>
Cc:     Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        "open list:CHROME HARDWARE PLATFORM SUPPORT" 
        <chrome-platform@...ts.linux.dev>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH 09/11] platform/chrome: cros_ec_proto: return
 standard error codes for EC errors

On Mon, Jun 27, 2022 at 7:49 PM Tzung-Bi Shih <tzungbi@...nel.org> wrote:
>
> cros_ec_wait_until_complete() checks `msg->result` for
> EC_CMD_GET_COMMS_STATUS.  However, it doesn't return standard error codes
> like most of others.

The callers of cros_ec_send_command() do the mapping. I am not sure if
it is a good idea to change that; it may have undesired side effects
(such as changing the userspace ABI) for callers of
cros_ec_send_command() not expecting this change. It would also result
in double mapping in some situations.

Guenter

>
> Use cros_ec_map_error() to align them.
>
> Signed-off-by: Tzung-Bi Shih <tzungbi@...nel.org>
> ---
>  drivers/platform/chrome/cros_ec_proto.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index 49772a4c5353..5323edddb540 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -138,7 +138,7 @@ static int cros_ec_wait_until_complete(struct cros_ec_device *ec_dev, uint32_t *
>  {
>         struct cros_ec_command *msg;
>         struct ec_response_get_comms_status *status;
> -       int ret = 0, i;
> +       int ret = 0, i, mapped;
>
>         msg = kzalloc(sizeof(*msg) + sizeof(*status), GFP_KERNEL);
>         if (!msg)
> @@ -160,8 +160,11 @@ static int cros_ec_wait_until_complete(struct cros_ec_device *ec_dev, uint32_t *
>                         break;
>
>                 *result = msg->result;
> -               if (msg->result != EC_RES_SUCCESS)
> +               mapped = cros_ec_map_error(msg->result);
> +               if (mapped) {
> +                       ret = mapped;
>                         break;
> +               }
>
>                 if (!(status->flags & EC_COMMS_STATUS_PROCESSING))
>                         break;
> --
> 2.37.0.rc0.161.g10f37bed90-goog
>