linux-kernel - Re: [RFC] rfkill - Add support for input key to control wireless radio

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Date:	Tue, 5 Dec 2006 10:32:39 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Ivo van Doorn <ivdoorn@...il.com>
Cc:	Dmitry Torokhov <dtor@...ightbb.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, John Linville <linville@...driver.com>,
	Jiri Benc <jbenc@...e.cz>,
	Lennart Poettering <lennart@...ttering.net>,
	Johannes Berg <johannes@...solutions.net>,
	Larry Finger <Larry.Finger@...inger.net>
Subject: Re: [RFC] rfkill - Add support for input key to control wireless radio

> +/*
> + * Function called by the key driver when the rfkill structure
> + * needs to be registered.
> + */
> +int rfkill_register_key(struct rfkill *rfkill, int init_status)
> +{
> +	struct rfkill_type *type = &master->type[rfkill->key_type];
> +	struct rfkill_key *key;
> +	int status;
> +
> +	if (!rfkill)
> +		return -EINVAL;	
> +
> +	if (rfkill->key_type >= KEY_TYPE_MAX)
> +		return -EINVAL;
> +
> +	/*
> +	 * Increase module use count to prevent this
> +	 * module to be unloaded while there are still
> +	 * registered keys.
> +	 */
> +	if (!try_module_get(THIS_MODULE))
> +		return -EBUSY;

This is obviously broken.  Please add a "struct module *owner;"
field to struct rfkill instead.

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