linux-kernel - Re: [PATCH 1/6] platform/chrome: cros_ec_proto: drop unneeded BUG_ON() in prepare

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Date:   Thu, 12 May 2022 07:53:36 -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>,
        chrome-platform@...ts.linux.dev,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/6] platform/chrome: cros_ec_proto: drop unneeded
 BUG_ON() in prepare_packet()

On Thu, May 12, 2022 at 1:36 AM Tzung-Bi Shih <tzungbi@...nel.org> wrote:
>
> prepare_packet() gets called if `ec_dev->proto_version` > 2.  For now, it
> must be equivalent to EC_HOST_REQUEST_VERSION.
>
> Drop the BUG_ON().
>
> Signed-off-by: Tzung-Bi Shih <tzungbi@...nel.org>

An alternative would be to return -EPROTO, but given the context this
is just a waste of code space.

Reviewed-by: Guenter Roeck <groeck@...omium.org>

> ---
>  drivers/platform/chrome/cros_ec_proto.c | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index ac1419881ff3..db1c8ba43171 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -60,7 +60,6 @@ static int prepare_packet(struct cros_ec_device *ec_dev,
>         int i;
>         u8 csum = 0;
>
> -       BUG_ON(ec_dev->proto_version != EC_HOST_REQUEST_VERSION);
>         BUG_ON(msg->outsize + sizeof(*request) > ec_dev->dout_size);
>
>         out = ec_dev->dout;
> --
> 2.36.0.512.ge40c2bad7a-goog
>