linux-kernel - Re: [PATCH v2 1/6] platform/chrome: cros_ec

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Date:   Wed, 21 Feb 2018 15:59:51 -0800
From:   Gwendal Grignou <gwendal@...omium.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Benson Leung <bleung@...omium.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        kernel@...labora.com, Guenter Roeck <groeck@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v2 1/6] platform/chrome: cros_ec_sysfs: Modify error handling

On Wed, Feb 21, 2018 at 9:07 AM, Enric Balletbo i Serra
<enric.balletbo@...labora.com> wrote:
> From: Gwendal Grignou <gwendal@...omium.org>
>
> When accessing a sysfs attribute, if the EC command fails, -EPROTO is
> now returned instead of an error message as it is unlikely an app is
> parsing the error message to do something meaningful.
> Also, this patch makes use of cros_ec_cmd_xfer_status() instead of
> cros_ec_cmd_xfer() so an error message is printed in the syslog.
>
> Signed-off-by: Gwendal Grignou <gwendal@...omium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Reviewed-by: Gwendal Grignou <gwendal@...omium.org>
> ---
> Changes since v1:
> - None
>
>  drivers/platform/chrome/cros_ec_sysfs.c | 25 ++++---------------------
>  1 file changed, 4 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_sysfs.c b/drivers/platform/chrome/cros_ec_sysfs.c
> index da0a719d32f7..c03621e523a3 100644
> --- a/drivers/platform/chrome/cros_ec_sysfs.c
> +++ b/drivers/platform/chrome/cros_ec_sysfs.c
> @@ -114,15 +114,9 @@ static ssize_t store_ec_reboot(struct device *dev,
>         msg->command = EC_CMD_REBOOT_EC + ec->cmd_offset;
>         msg->outsize = sizeof(*param);
>         msg->insize = 0;
> -       ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
> -       if (ret < 0) {
> +       ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
> +       if (ret < 0)
>                 count = ret;
> -               goto exit;
> -       }
> -       if (msg->result != EC_RES_SUCCESS) {
> -               dev_dbg(ec->dev, "EC result %d\n", msg->result);
> -               count = -EINVAL;
> -       }
>  exit:
>         kfree(msg);
>         return count;
> @@ -150,17 +144,11 @@ static ssize_t show_ec_version(struct device *dev,
>         msg->command = EC_CMD_GET_VERSION + ec->cmd_offset;
>         msg->insize = sizeof(*r_ver);
>         msg->outsize = 0;
> -       ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
> +       ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
>         if (ret < 0) {
>                 count = ret;
>                 goto exit;
>         }
> -       if (msg->result != EC_RES_SUCCESS) {
> -               count = scnprintf(buf, PAGE_SIZE,
> -                                 "ERROR: EC returned %d\n", msg->result);
> -               goto exit;
> -       }
> -
>         r_ver = (struct ec_response_get_version *)msg->data;
>         /* Strings should be null-terminated, but let's be sure. */
>         r_ver->version_string_ro[sizeof(r_ver->version_string_ro) - 1] = '\0';
> @@ -255,14 +243,9 @@ static ssize_t show_ec_flashinfo(struct device *dev,
>         msg->command = EC_CMD_FLASH_INFO + ec->cmd_offset;
>         msg->insize = sizeof(*resp);
>         msg->outsize = 0;
> -       ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
> +       ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
>         if (ret < 0)
>                 goto exit;
> -       if (msg->result != EC_RES_SUCCESS) {
> -               ret = scnprintf(buf, PAGE_SIZE,
> -                               "ERROR: EC returned %d\n", msg->result);
> -               goto exit;
> -       }
>
>         resp = (struct ec_response_flash_info *)msg->data;
>
> --
> 2.16.1
>