linux-kernel - Re: [PATCH 1/6] mfd: cros_ec: fail early if we cannot identify the EC

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Message-ID: <CAMHSBOUTrkyANDovR1eV4c80ci2hf3tm+0rPTijojHuBm-gH2g@mail.gmail.com>
Date:   Wed, 21 Feb 2018 15:52:31 -0800
From:   Gwendal Grignou <gwendal@...omium.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Guenter Roeck <groeck@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        kernel@...labora.com, Vincent Palatin <vpalatin@...omium.org>
Subject: Re: [PATCH 1/6] mfd: cros_ec: fail early if we cannot identify the EC

On Mon, Feb 19, 2018 at 2:46 PM, Enric Balletbo i Serra
<enric.balletbo@...labora.com> wrote:
> From: Vincent Palatin <vpalatin@...omium.org>
>
> If we cannot communicate with the EC chip to detect the protocol version
> and its features, it's very likely useless to continue. Else we will
> commit all kind of uninformed mistakes (using the wrong protocol, the
> wrong buffer size, mixing the EC with other chips).
>
> Signed-off-by: Vincent Palatin <vpalatin@...omium.org>
> Acked-by: Benson Leung <bleung@...omium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Reviewed-by: Gwendal Grignou <gwendal@...omium.org>
> ---
>  drivers/mfd/cros_ec.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index d61024141e2b..74780f2964a1 100644
> --- a/drivers/mfd/cros_ec.c
> +++ b/drivers/mfd/cros_ec.c
> @@ -112,7 +112,11 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
>
>         mutex_init(&ec_dev->lock);
>
> -       cros_ec_query_all(ec_dev);
> +       err = cros_ec_query_all(ec_dev);
> +       if (err) {
> +               dev_err(dev, "Cannot identify the EC: error %d\n", err);
> +               return err;
> +       }
>
>         if (ec_dev->irq) {
>                 err = request_threaded_irq(ec_dev->irq, NULL, ec_irq_thread,
> --
> 2.16.1
>