linux-kernel - Re: [PATCH 4/6] hwrng: st: Add support for ST's HW Random Number Generator

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Message-ID: <CAOMZO5CWywFHd1HE2=G-KEvQZpu_rJibmJL4fL5yCWRsnpi05Q@mail.gmail.com>
Date:	Sat, 12 Sep 2015 20:04:49 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Pankaj Dev <pankaj.dev@...com>, linux-crypto@...r.kernel.org,
	Matt Mackall <mpm@...enic.com>, kernel@...inux.com
Subject: Re: [PATCH 4/6] hwrng: st: Add support for ST's HW Random Number Generator

On Fri, Sep 11, 2015 at 5:08 PM, Lee Jones <lee.jones@...aro.org> wrote:

> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       base = devm_ioremap_resource(&pdev->dev, res);
> +       if (IS_ERR(base))
> +               return PTR_ERR(base);
> +
> +       clk = devm_clk_get(&pdev->dev, NULL);
> +       if (!clk)
> +               return -EINVAL;

This should be:

    if (IS_ERR(clk))
        return PTR_ERR(clk);

> +
> +       clk_prepare_enable(clk);

This may fail, so better check its return value and propagate it on error.

> +
> +       ddata->ops.priv = (unsigned long)ddata;
> +       ddata->ops.read = st_rng_read;
> +       ddata->ops.name = pdev->name;
> +       ddata->base     = base;
> +       ddata->clk      = clk;
> +
> +       dev_set_drvdata(&pdev->dev, ddata);
> +
> +       ret = hwrng_register(&ddata->ops);
> +       if (ret) {
> +               dev_err(&pdev->dev, "Failed to register HW RNG\n");
> +               return ret;
> +       }
> +
> +       dev_info(&pdev->dev, "Successfully registered HW RNG\n");

No need to put this info.
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