linux-kernel - Re: [PATCH v2 01/10] platform/chrome: cros_kunit_util: add default value for `msg->result`

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Date:   Mon, 18 Jul 2022 06:35:42 -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: [PATCH v2 01/10] platform/chrome: cros_kunit_util: add default
 value for `msg->result`

On Sun, Jul 17, 2022 at 10:10 PM Tzung-Bi Shih <tzungbi@...nel.org> wrote:
>
> Add default value for `msg->result` so that it won't be garbage bytes
> when the mock list is empty.
>
> Signed-off-by: Tzung-Bi Shih <tzungbi@...nel.org>
> ---
> No v1.  New in the series.
>
>  drivers/platform/chrome/cros_kunit_util.c | 7 ++++++-
>  drivers/platform/chrome/cros_kunit_util.h | 1 +
>  2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/platform/chrome/cros_kunit_util.c b/drivers/platform/chrome/cros_kunit_util.c
> index e031777dea87..6810d558d462 100644
> --- a/drivers/platform/chrome/cros_kunit_util.c
> +++ b/drivers/platform/chrome/cros_kunit_util.c
> @@ -13,6 +13,8 @@
>  #include "cros_ec.h"
>  #include "cros_kunit_util.h"
>
> +int cros_kunit_ec_xfer_mock_default_result;
> +EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_result);

Is this needed as a global variable and, if so, does it really have to
be exported ?

>  int cros_kunit_ec_xfer_mock_default_ret;
>  EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_ret);

Same here, really, only I didn't notice before.

Thanks,
Guenter

>
> @@ -24,8 +26,10 @@ int cros_kunit_ec_xfer_mock(struct cros_ec_device *ec_dev, struct cros_ec_comman
>         struct ec_xfer_mock *mock;
>
>         mock = list_first_entry_or_null(&cros_kunit_ec_xfer_mock_in, struct ec_xfer_mock, list);
> -       if (!mock)
> +       if (!mock) {
> +               msg->result = cros_kunit_ec_xfer_mock_default_result;
>                 return cros_kunit_ec_xfer_mock_default_ret;
> +       }
>
>         list_del(&mock->list);
>
> @@ -89,6 +93,7 @@ EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_next);
>
>  void cros_kunit_mock_reset(void)
>  {
> +       cros_kunit_ec_xfer_mock_default_result = 0;
>         cros_kunit_ec_xfer_mock_default_ret = 0;
>         INIT_LIST_HEAD(&cros_kunit_ec_xfer_mock_in);
>         INIT_LIST_HEAD(&cros_kunit_ec_xfer_mock_out);
> diff --git a/drivers/platform/chrome/cros_kunit_util.h b/drivers/platform/chrome/cros_kunit_util.h
> index 79c4525f873c..79c4f259f2bb 100644
> --- a/drivers/platform/chrome/cros_kunit_util.h
> +++ b/drivers/platform/chrome/cros_kunit_util.h
> @@ -23,6 +23,7 @@ struct ec_xfer_mock {
>         u32 o_data_len;
>  };
>
> +extern int cros_kunit_ec_xfer_mock_default_result;
>  extern int cros_kunit_ec_xfer_mock_default_ret;
>
>  int cros_kunit_ec_xfer_mock(struct cros_ec_device *ec_dev, struct cros_ec_command *msg);
> --
> 2.37.0.170.g444d1eabd0-goog
>