netdev - Re: [PATCH 2/3] arch/ : Platform changes for UCC TDM driver for MPC8323ERDB.Also includes related QE changes.

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Date:	Tue, 11 Dec 2007 11:18:55 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Poonam_Aggrwal-b10812 <b10812@...escale.com>
Cc:	rubini@...ion.unipv.it, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, kumar.gala@...escale.com,
	linuxppc-dev@...abs.org, michael.barkowski@...escale.com,
	rich.cutler@...escale.com, ashish.kalra@...escale.com
Subject: Re: [PATCH 2/3] arch/ : Platform changes for UCC TDM driver for
 MPC8323ERDB.Also includes related QE changes.

On Mon, 10 Dec 2007 17:39:22 +0530 (IST) Poonam_Aggrwal-b10812 <b10812@...escale.com> wrote:
>
> +++ b/arch/powerpc/sysdev/qe_lib/qe.c
> @@ -149,22 +149,116 @@ EXPORT_SYMBOL(qe_issue_cmd);
>   */
>  static unsigned int brg_clk = 0;
>  
> -unsigned int get_brg_clk(void)
> +u32 get_brg_clk(enum qe_clock brgclk, enum qe_clock *brg_source)
>  {
> -	struct device_node *qe;
> -	if (brg_clk)
> -		return brg_clk;
> +	struct device_node *qe, *brg, *clocks;
> +	enum qe_clock brg_src;
> +	u32 brg_input_freq = 0;
> +	u32 brg_num;
> +	const unsigned int *prop;
>  
> -	qe = of_find_node_by_type(NULL, "qe");
> -	if (qe) {
> +	*brg_source = 0;
> +
> +	brg_num = brgclk - QE_BRG1;
> +	brg = of_find_compatible_node(NULL, NULL, "fsl,cpm-brg");
> +	if (brg) {
>  		unsigned int size;
> -		const u32 *prop = of_get_property(qe, "brg-frequency", &size);
> -		brg_clk = *prop;
> -		of_node_put(qe);
> -	};
> +		prop = of_get_property(brg,
> +					"fsl,brg-sources", &size);
> +
> +		brg_src = *(prop + brg_num);

You should probably sanity check that prop is not NULL and points to
something large enough.

You don't use brg after here, so the "of_node_put(brg)" could go here to
save putting it in multiple places later.  Also, currently there are
paths through the following code that do not do the of_node_put(brg).

> +		if (brg_src == 0) {
> +			*brg_source = 0;
> +			if (brg_clk > 0) {
> +				of_node_put(brg);
> +				return brg_clk;
> +			}
> +			qe = of_find_node_by_type(NULL, "qe");
> +			if (qe) {
> +				unsigned int size;
> +				prop = of_get_property
> +						(qe, "brg-frequency", &size);
> +				of_node_put(qe);
> +				of_node_put(brg);
> +				return *prop;

NULL check here (yes, I know that the old code didn't check).

> +			}
> +		} else {
> +			*brg_source = brg_src + QE_CLK1 - 1;
> +			clocks = of_find_compatible_node(NULL, NULL,
> +							"fsl,cpm-clocks");
> +			prop = of_get_property(clocks,
> +						"#clock-cells", &size);
> +			/*
> +			 * clock-cells = 1 only supported right now.
> +			 */
> +			if (*prop != 1)

Again check for NULL (and possibly size).

> +				return 0;
> +			prop = of_get_property(clocks,
> +						"clock-frequency", &size);
> +
> +			brg_input_freq = *(prop+(brg_src - 1));

And again.

> +			of_node_put(clocks);
> +			of_node_put(brg);
> +			return brg_input_freq;
> +		}
> +	}
>  	return brg_clk;
>  }
-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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