linux-kernel - Re: [PATCH v2 0/4] platform/chrome: cros_ec_proto: Convert EC error codes to Linux error codes

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Message-ID: <20200722220301.GB2137556@google.com>
Date:   Wed, 22 Jul 2020 15:03:01 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Benson Leung <bleung@...omium.org>,
        Jonathan Cameron <jic23@...nel.org>, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yu-Hsuan Hsu <yuhsuan@...omium.org>,
        Prashant Malani <pmalani@...omium.org>
Subject: Re: [PATCH v2 0/4] platform/chrome: cros_ec_proto: Convert EC error
 codes to Linux error codes

Hi Guenter,

On Mon, Jul 20, 2020 at 01:22:39PM -0700, Guenter Roeck wrote:
> The EC reports a variety of error codes. Most of those, with the exception
> of EC_RES_INVALID_VERSION, are converted to -EPROTO. As result, the actual
> error code gets lost. In cros_ec_cmd_xfer_status(), convert all EC errors
> to Linux error codes to report a more meaningful error to the caller to aid
> debugging.
> 
> To prepare for this change, handle error codes other than -EPROTO for all
> callers of cros_ec_cmd_xfer_status(). Specifically, no longer assume that
> -EPROTO reflects an error from the EC and all other error codes reflect a
> transfer error.
> 
> v2: Add patches 1/4 to 3/4 to handle callers of cros_ec_cmd_xfer_status()

I did a rough grep to see what you might be missing:

  git grep -n EPROTO | grep -e cros -e '-ec'

I think cros-ec-pwm / cros_ec_num_pwms() might need fixing too? Boy, I
wrote that, but it sure ain't easy to read...(*checks watch*)...4 years
later.

Apart from the notes already made, I think the series looks good:

Reviewed-by: Brian Norris <briannorris@...omium.org>

Feel free to CC me on v3, if you want another look

Brian