linux-kernel - Re: [PATCH v2 4/5] clocksource: add driver for i.MX EPIT timer

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Date:   Tue, 29 May 2018 12:20:55 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>,
        Colin Didier <colin.didier@...ialet.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        NXP Linux Team <linux-imx@....com>,
        Clément Peron <clement.peron@...ialet.com>
Subject: Re: [PATCH v2 4/5] clocksource: add driver for i.MX EPIT timer

On Tue, May 29, 2018 at 12:04 PM, Clément Péron <peron.clem@...il.com> wrote:

> +static int __init epit_timer_init(struct device_node *np)
> +{
> +       struct epit_timer *epittm;
> +       struct clk *clk_ipg;
> +       int ret;
> +
> +       epittm = kzalloc(sizeof(*epittm), GFP_KERNEL);
> +       if (!epittm)
> +               return -ENOMEM;
> +
> +       epittm->base = of_iomap(np, 0);
> +       if (!epittm->base) {
> +               ret = -ENXIO;
> +               goto out_kfree;
> +       }
> +
> +       epittm->irq = irq_of_parse_and_map(np, 0);
> +       if (!epittm->irq) {
> +               ret = -EINVAL;
> +               goto out_kfree;

You should jump to out_iounmap and call of_iounmap().

> +       }
> +
> +       clk_ipg = of_clk_get_by_name(np, "ipg");
> +       if (IS_ERR(clk_ipg)) {
> +               pr_err("i.MX EPIT: unable to get clk_ipg\n");
> +               ret = PTR_ERR(clk_ipg);
> +               goto out_kfree;
> +       }
> +       clk_prepare_enable(clk_ipg);

clk_prepare_enable() may fail, so better check its return value and
propagate it in the case of error.

> +
> +       epittm->clk_per = of_clk_get_by_name(np, "per");
> +       if (IS_ERR(epittm->clk_per)) {
> +               pr_err("i.MX EPIT: unable to get clk_per\n");
> +               ret = PTR_ERR(epittm->clk_per);
> +               goto out_clk_ipg_disable;
> +       }
> +       clk_prepare_enable(epittm->clk_per);

Ditto.

> +
> +       /*
> +        * Initialise to a known state (all timers off, and timing reset)
> +        */

For a single line of comment you could simply write:

/* bla bla */