linux-kernel - Re: [PATCH v2 04/15] mmc: mmci: Add support for setting pad type via pinctrl

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Date:   Wed, 17 Jan 2018 10:34:46 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Patrice CHOTARD <patrice.chotard@...com>
Cc:     Russell King <linux@...linux.org.uk>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org,
        Andrea Merello <andrea.merello@...il.com>
Subject: Re: [PATCH v2 04/15] mmc: mmci: Add support for setting pad type via pinctrl

[...]

>         /*
> @@ -1616,6 +1625,32 @@ static int mmci_probe(struct amba_device *dev,
>         host = mmc_priv(mmc);
>         host->mmc = mmc;
>
> +       /*
> +        * Some variant (STM32) doesn't have opendrain bit, nevertheless
> +        * pins can be set accordingly using pinctrl
> +        */
> +       if (!variant->opendrain) {
> +               host->pinctrl = devm_pinctrl_get(&dev->dev);
> +               if (IS_ERR(host->pinctrl)) {
> +                       dev_err(&dev->dev, "failed to get pinctrl");
> +                       goto host_free;
> +               }
> +
> +               host->pins_default = pinctrl_lookup_state(host->pinctrl,
> +                                                         PINCTRL_STATE_DEFAULT);
> +               if (IS_ERR(host->pins_default)) {
> +                       dev_warn(mmc_dev(mmc), "Can't select default pins\n");
> +                       host->pins_default = NULL;

This is wrong, I think you should bail out and return the error code instead.

Moreover, calling pinctrl_select_state() from ->set_ios by using a
NULL state, will likely trigger a NULL pointer deference bug in the
pinctrl layer.

> +               }
> +
> +               host->pins_opendrain = pinctrl_lookup_state(host->pinctrl,
> +                                                           MMCI_PINCTRL_STATE_OPENDRAIN);
> +               if (IS_ERR(host->pins_opendrain)) {
> +                       dev_warn(mmc_dev(mmc), "Can't select opendrain pins\n");
> +                       host->pins_opendrain = NULL;

Ditto.

> +               }
> +       }
> +

[...]

Kind regards
Uffe