linux-kernel - Re: [PATCH 4/15] drivers/dma/pl330.c: add missing iounmap

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Message-ID: <1327980373.1527.52.camel@vkoul-udesk3>
Date:	Tue, 31 Jan 2012 08:56:13 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Julia Lawall <Julia.Lawall@...6.fr>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/15] drivers/dma/pl330.c: add missing iounmap

On Thu, 2012-01-12 at 10:55 +0100, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@...6.fr>
> 
> Add missing iounmap in error handling code, in a case where the function
> already preforms iounmap on some other execution path.
> 
> This patch additionally adds calls to clk_disable and clk_put.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression e;
> statement S,S1;
> int ret;
> @@
> e = \(ioremap\|ioremap_nocache\)(...)
> ... when != iounmap(e)
> if (<+...e...+>) S
> ... when any
>     when != iounmap(e)
> *if (...)
>    { ... when != iounmap(e)
>      return ...; }
> ... when any
> iounmap(e);
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> 
> ---
> Perhaps clk_put is not needed?  It is not present in the remove function.
> 
>  drivers/dma/pl330.c |   17 +++++++++++------
>  1 file changed, 11 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
> index 2b3aab3..2f83094 100644
> --- a/drivers/dma/pl330.c
> +++ b/drivers/dma/pl330.c
> @@ -2690,7 +2690,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
>  	if (IS_ERR(pdmac->clk)) {
>  		dev_err(&adev->dev, "Cannot get operation clock.\n");
>  		ret = -EINVAL;
> -		goto probe_err1;
> +		goto probe_err2;
>  	}
>  
>  	amba_set_drvdata(adev, pdmac);
> @@ -2704,11 +2704,11 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
>  	ret = request_irq(irq, pl330_irq_handler, 0,
>  			dev_name(&adev->dev), pi);
>  	if (ret)
> -		goto probe_err2;
> +		goto probe_err3;
>  
>  	ret = pl330_add(pi);
>  	if (ret)
> -		goto probe_err3;
> +		goto probe_err4;
>  
>  	INIT_LIST_HEAD(&pdmac->desc_pool);
>  	spin_lock_init(&pdmac->pool_lock);
> @@ -2765,7 +2765,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
>  	ret = dma_async_device_register(pd);
>  	if (ret) {
>  		dev_err(&adev->dev, "unable to register DMAC\n");
> -		goto probe_err4;
> +		goto probe_err5;
>  	}
>  
>  	dev_info(&adev->dev,
> @@ -2778,10 +2778,15 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
>  
>  	return 0;
>  
> -probe_err4:
> +probe_err5:
>  	pl330_del(pi);
> -probe_err3:
> +probe_err4:
>  	free_irq(irq, pi);
> +probe_err3:
> +#ifndef CONFIG_PM_RUNTIME
> +	clk_disable(pdmac->clk);
> +#endif
> +	clk_put(pdmac->clk);
>  probe_err2:
>  	iounmap(pi->base);
>  probe_err1:
> 
Applied thanks

-- 
~Vinod

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