linux-kernel - Re: [PATCH-v2 2/8] cpuidle: add cpuidle_unregister

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Date:	Wed, 26 May 2010 22:13:01 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Len Brown <lenb@...nel.org>
Cc:	x86@...nel.org, linux-pm@...ts.linux-foundation.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH-v2 2/8] cpuidle: add cpuidle_unregister_driver() error
 check

On Thu, 27 May 2010 01:11:03 -0400 (EDT) Len Brown <lenb@...nel.org> wrote:

> From: Len Brown <len.brown@...el.com>
> 
> BUG_ON() cpuidle_unregister_driver() being called with
> a driver not matching the onee that successfully registered.
> 
> Signed-off-by: Len Brown <len.brown@...el.com>
> ---
>  drivers/cpuidle/driver.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
> index 2257004..5b6fd0f 100644
> --- a/drivers/cpuidle/driver.c
> +++ b/drivers/cpuidle/driver.c
> @@ -45,8 +45,7 @@ EXPORT_SYMBOL_GPL(cpuidle_register_driver);
>   */
>  void cpuidle_unregister_driver(struct cpuidle_driver *drv)
>  {
> -	if (!drv)
> -		return;
> +	BUG_ON(drv != cpuidle_curr_driver)
>  
>  	spin_lock(&cpuidle_driver_lock);
>  	cpuidle_curr_driver = NULL;

Actually, WARN_ON is nicer ;)   There's no point in killing the user's
machine over this recoverable error.

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