linux-kernel - Re: [PATCH 3/4 v4] video, sm501: add OF binding to support SM501

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Date:	Tue, 25 Jan 2011 16:48:20 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Heiko Schocher <hs@...x.de>
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-fbdev@...r.kernel.org,
	devicetree-discuss@...abs.org, Ben Dooks <ben@...tec.co.uk>,
	Vincent Sanders <vince@...tec.co.uk>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [PATCH 3/4 v4] video, sm501: add OF binding to support SM501

On Tue, Jan 25, 2011 at 08:20:31AM +0100, Heiko Schocher wrote:
> @@ -1934,7 +1943,29 @@ static int __devinit sm501fb_probe(struct platform_device *pdev)
>  	}
>  
>  	if (info->pdata == NULL) {
> -		dev_info(dev, "using default configuration data\n");
> +		int found = 0;
> +#if defined(CONFIG_OF)
> +		struct device_node *np = pdev->dev.parent->of_node;
> +		const u8 *prop;
> +		const char *cp;
> +		int len;
> +
> +		info->pdata = &sm501fb_def_pdata;
> +		if (np) {
> +			/* Get EDID */
> +			cp = of_get_property(np, "mode", &len);
> +			if (cp)
> +				strcpy(fb_mode, cp);
> +			prop = of_get_property(np, "edid", &len);
> +			if (prop && len == EDID_LENGTH) {
> +				info->edid_data = kmemdup(prop, EDID_LENGTH,
> +							  GFP_KERNEL);
> +				found = 1;
> +			}
> +		}
> +#endif
> +		if (!found)
> +			dev_info(dev, "using default configuration data\n");
>  	}
>  
>  	/* probe for the presence of each panel */

Starting to get a bit pedantic.. but kmemdup() tries to do a kmalloc(),
and so can fail. Your other patches handle the info->edid_data == NULL
case, in addition to the kfree(), but you're probably going to want to
chomp that found assignment incase of the allocation failing and falling
back on the default mode.

You also don't really have any need to keep the EDID block around after
probe as far as I can tell, so you should be able to rework this in to
something more like:

	info->edid_data = kmemdup(..);
	...
	if (info->edid_data) {
		fb_edid_to_monspecs(..);
		kfree(info->edid_data);
		fb_videomode_to_modelist(..);
	}

	...
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