linux-kernel - Re: [PATCH 6/10] drivers/char/hw_random/nomadik-rng.c: add missing clk

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Date:	Wed, 01 Jun 2011 12:20:46 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Julia Lawall <julia@...u.dk>
Cc:	kernel-janitors@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Russell King <rmk+kernel@....linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/10] drivers/char/hw_random/nomadik-rng.c: add missing
 clk_put

On Wed, 2011-06-01 at 19:10 +0200, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> Jump to the end of the function for the clk_disable and clk_put rather than
> returning directly.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @r exists@
> expression e1,e2;
> statement S;
> @@
> 
> e1 = clk_get@p1(...);
> ... when != e1 = e2
>     when != clk_put(e1)
>     when any
> if (...) { ... when != clk_put(e1)
>                when != if (...) { ... clk_put(e1) ... }
> * return@p3 ...;
>  } else S
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>

This one also looks good to me.

Signed-off-by: Matt Mackall <mpm@...enic.com>

> ---
>  drivers/char/hw_random/nomadik-rng.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/char/hw_random/nomadik-rng.c b/drivers/char/hw_random/nomadik-rng.c
> index dd1d143..52e08ca 100644
> --- a/drivers/char/hw_random/nomadik-rng.c
> +++ b/drivers/char/hw_random/nomadik-rng.c
> @@ -55,7 +55,7 @@ static int nmk_rng_probe(struct amba_device *dev, const struct amba_id *id)
>  
>  	ret = amba_request_regions(dev, dev->dev.init_name);
>  	if (ret)
> -		return ret;
> +		goto out_clk;
>  	ret = -ENOMEM;
>  	base = ioremap(dev->res.start, resource_size(&dev->res));
>  	if (!base)
> @@ -70,6 +70,7 @@ out_unmap:
>  	iounmap(base);
>  out_release:
>  	amba_release_regions(dev);
> +out_clk:
>  	clk_disable(rng_clk);
>  	clk_put(rng_clk);
>  	return ret;
> 
> --
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-- 
Mathematics is the supreme nostalgia of our time.


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