linux-kernel - Re: [PATCH 7/7] [RFC] APM emulation driver for class batteries

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Message-ID: <20070416202421.GC19713@flint.arm.linux.org.uk>
Date:	Mon, 16 Apr 2007 21:24:21 +0100
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Anton Vorontsov <cbou@...l.ru>
Cc:	linux-kernel@...r.kernel.org, kernel-discuss@...dhelds.org
Subject: Re: [PATCH 7/7] [RFC] APM emulation driver for class batteries

On Fri, Apr 13, 2007 at 05:50:43PM +0400, Anton Vorontsov wrote:
> +static void (*old_apm_get_power_status)(struct apm_power_info*);
> +
> +static int __init apm_battery_init(void)
> +{
> +	printk(KERN_INFO "APM Battery Driver\n");
> +
> +	old_apm_get_power_status = apm_get_power_status;
> +	apm_get_power_status = apm_battery_apm_get_power_status;
> +	return 0;
> +}
> +
> +static void __exit apm_battery_exit(void)
> +{
> +	apm_get_power_status = old_apm_get_power_status;
> +	return;
> +}

Utterly unsafe.  What happens if some other module gets loaded which
does this, and then this module is unloaded followed by the other
module.  Result: Oops.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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