linux-kernel - Re: [PATCH 1/2] pinctrl: tegra: add suspend-resume support

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Date:	Tue, 23 Apr 2013 20:43:32 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Bibek Basu <bbasu@...dia.com>
Cc:	linus.walleij@...aro.org, swarren@...dotorg.org,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pritesh Raithatha <praithatha@...dia.com>
Subject: Re: [PATCH 1/2] pinctrl: tegra: add suspend-resume support

> diff --git a/drivers/pinctrl/pinctrl-tegra.c b/drivers/pinctrl/pinctrl-tegra.c
[...]
> @@ -41,6 +42,8 @@ struct tegra_pmx {
>  
>  	int nbanks;
>  	void __iomem **regs;
> +	int *regs_size;

Perhaps this should be unsigned int *. The values stored in this array
will never be negative, right?

>  int tegra_pinctrl_probe(struct platform_device *pdev,
>  			const struct tegra_pinctrl_soc_data *soc_data)
>  {
> -	struct tegra_pmx *pmx;
>  	struct resource *res;
> -	int i;
> +	struct tegra_pmx *pmx;
> +	int i, pg_data_size = 0;

There's a needless move of the pmx variable declaration here.

> @@ -735,6 +769,21 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
>  		return -ENODEV;
>  	}
>  
> +if (IS_ENABLED(CONFIG_PM_SLEEP))
> +	pmx->regs_size = devm_kzalloc(&pdev->dev,
> +				pmx->nbanks * sizeof(*(pmx->regs_size)),
> +				GFP_KERNEL);
> +	if (!pmx->regs_size) {
> +		dev_err(&pdev->dev, "Can't alloc regs pointer\n");
> +		return -ENODEV;
> +	}
> +
> +	pmx->pg_data = devm_kzalloc(&pdev->dev, pg_data_size, GFP_KERNEL);
> +	if (!pmx->pg_data) {
> +		dev_err(&pdev->dev, "Can't alloc pingroup data pointer\n");
> +		return -ENODEV;
> +	}

I don't think this works the way you expect it to. The line

	if (IS_ENABLED(CONFIG_PM_SLEEP))

is a standard conditional and therefore needs to be properly indented
and use { and } to delimit the block.

> @@ -756,6 +805,9 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
>  			dev_err(&pdev->dev, "Couldn't ioremap regs %d\n", i);
>  			return -ENODEV;
>  		}
> +
> +if (IS_ENABLED(CONFIG_PM_SLEEP))
> +		pmx->regs_size[i] = resource_size(res);

In this case it will actually work as expected, but the if () should be
properly indented.

Thierry

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