linux-kernel - Re: [PATCH 13/13] clk: basic: improve parent

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Date:	Thu, 12 Apr 2012 14:49:23 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Mike Turquette <mturquette@...aro.org>
Cc:	arnd.bergmann@...aro.org, Andrew Lunn <andrew@...n.ch>,
	Viresh Kumar <viresh.kumar@...com>,
	Rajendra Nayak <rnayak@...com>, patches@...aro.org,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Saravana Kannan <skannan@...eaurora.org>,
	Olof Johansson <olof@...om.net>, linaro-dev@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 13/13] clk: basic: improve parent_names & return errors

On Wed, Apr 11, 2012 at 06:02:51PM -0700, Mike Turquette wrote:
...
> @@ -175,23 +188,32 @@ struct clk *clk_register_divider(struct device *dev, const char *name,
>  	div->flags = clk_divider_flags;
>  	div->lock = lock;
>  
> +	/* allocate the temporary parent_names */
>  	if (parent_name) {
> -		div->parent[0] = kstrdup(parent_name, GFP_KERNEL);
> -		if (!div->parent[0])
> -			goto out;
> +		parent_names[0] = kstrdup(parent_name, GFP_KERNEL);
> +		if (!parent_names[0]) {
> +			pr_err("%s: could not allocate parent_names\n",
> +					__func__);
> +			goto fail_parent_names;
> +		}
>  	}

Why do we need to copy the parent_names here at all?  clk_register()
has done that for each basic clk.

Regards,
Shawn

>  
> +	/* register the clock */
>  	clk = clk_register(dev, name,
>  			&clk_divider_ops, &div->hw,
> -			div->parent,
> +			(parent_name ? parent_names: NULL),
>  			(parent_name ? 1 : 0),
>  			flags);
> -	if (clk)
> -		return clk;
>  
> -out:
> -	kfree(div->parent[0]);
> -	kfree(div);
> +	/* free the temporary parent_names */
> +	if (parent_name)
> +		kfree(parent_names[0]);
> +
> +	if (!IS_ERR(clk))
> +		goto out;
>  
> -	return NULL;
> +fail_parent_names:
> +	kfree(div);
> +out:
> +	return clk;
>  }
--
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