linux-kernel - Re: [PATCH 4/4] pinctrl/abx500: destroy mutex if returning early due to error

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Date:	Wed, 30 Jan 2013 13:10:29 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Linus Walleij <linus.walleij@...ricsson.com>
CC:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Stephen Warren <swarren@...dia.com>,
	Anmar Oueja <anmar.oueja@...aro.org>,
	Lee Jones <lee.jones@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 4/4] pinctrl/abx500: destroy mutex if returning early
 due to error

On 01/30/2013 12:40 PM, Linus Walleij wrote:
> From: Lee Jones <lee.jones@...aro.org>
> 
> Current failure path neglects to mutex_destroy() before returning
> an error due to an invalid parameter or an error received from
> gpiochip_add(). This patch aims to remedy that behaviour.

> diff --git a/drivers/pinctrl/pinctrl-abx500.c b/drivers/pinctrl/pinctrl-abx500.c

> @@ -1155,11 +1155,13 @@ static int abx500_gpio_probe(struct platform_device *pdev)
>  	default:
>  		dev_err(&pdev->dev, "Unsupported pinctrl sub driver (%d)\n",
>  				(int) platid->driver_data);
> +		mutex_destroy(&pct->lock);
>  		return -EINVAL;

Especially given there's already a label out_free which performs this
mutex_destroy(), those last two lines would be better as:

ret = -EINVAL;
goto out_free;

>  	}
>  
>  	if (!pct->soc) {
>  		dev_err(&pdev->dev, "Invalid SOC data\n");
> +		mutex_destroy(&pct->lock);
>  		return -EINVAL;

Same there.

>  	}
>  
> @@ -1176,6 +1178,7 @@ static int abx500_gpio_probe(struct platform_device *pdev)
>  	ret = gpiochip_add(&pct->chip);
>  	if (ret) {
>  		dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
> +		mutex_destroy(&pct->lock);
>  		goto out_rem_irq;

And here, just change the goto target to out_free rather than adding the
mutex_destroy() call.

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