linux-kernel - Re: [PATCH] of: fix race when matching drivers

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Message-ID: <20110518154517.GA26070@entuzijast.net>
Date:	Wed, 18 May 2011 17:45:17 +0200
From:	Josip Rodin <joy@...uzijast.net>
To:	Milton Miller <miltonm@....com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	David Miller <davem@...emloft.net>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	sparclinux@...r.kernel.org
Subject: Re: [PATCH] of: fix race when matching drivers

On Wed, May 18, 2011 at 10:27:39AM -0500, Milton Miller wrote:
> --- work.git.orig/include/linux/of_device.h	2011-05-18 09:57:01.014386816 -0500
> +++ work.git/include/linux/of_device.h	2011-05-18 09:58:27.537431575 -0500
> @@ -21,8 +21,15 @@ extern void of_device_make_bus_id(struct
>  static inline int of_driver_match_device(struct device *dev,
>  					 const struct device_driver *drv)
>  {
> -	dev->of_match = of_match_device(drv->of_match_table, dev);
> -	return dev->of_match != NULL;
> +	const struct of_device_id *match;
> +
> +	match = of_match_device(drv->of_match_table, dev);
> +	if (match) {
> +		dev->of_match = of_match_device(drv->of_match_table, dev);
> +		return 1;
> +	}
> +
> +	return 0;
>  }

Err, is there some reason to avoid simply assigning the existing result:
dev->of_match = match; ?

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