linux-kernel - Re: [linux-pm] [PATCHv3 2/5] cpuidle: fix error handling in __cpuidle_register

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Message-Id: <201205032250.26434.rjw@sisk.pl>
Date:	Thu, 3 May 2012 22:50:26 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	linux-pm@...ts.linux-foundation.org
Cc:	Colin Cross <ccross@...roid.com>, linux-kernel@...r.kernel.org,
	Kevin Hilman <khilman@...com>, Len Brown <len.brown@...el.com>,
	Russell King <linux@....linux.org.uk>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	Kay Sievers <kay.sievers@...y.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Arnd Bergmann <arnd.bergmann@...aro.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [linux-pm] [PATCHv3 2/5] cpuidle: fix error handling in __cpuidle_register_device

On Monday, April 30, 2012, Colin Cross wrote:
> Fix the error handling in __cpuidle_register_device to include
> the missing list_del.  Move it to a label, which will simplify
> the error handling when coupled states are added.
> 
> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@...com>
> Tested-by: Santosh Shilimkar <santosh.shilimkar@...com>
> Reviewed-by: Kevin Hilman <khilman@...com>
> Tested-by: Kevin Hilman <khilman@...com>
> Signed-off-by: Colin Cross <ccross@...roid.com>

Reviewed-by: Rafael J. Wysocki <rjw@...k.pl>

> ---
>  drivers/cpuidle/cpuidle.c |   13 +++++++++----
>  1 files changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
> index 3e3e3e4..4540672 100644
> --- a/drivers/cpuidle/cpuidle.c
> +++ b/drivers/cpuidle/cpuidle.c
> @@ -403,13 +403,18 @@ static int __cpuidle_register_device(struct cpuidle_device *dev)
>  
>  	per_cpu(cpuidle_devices, dev->cpu) = dev;
>  	list_add(&dev->device_list, &cpuidle_detected_devices);
> -	if ((ret = cpuidle_add_sysfs(cpu_dev))) {
> -		module_put(cpuidle_driver->owner);
> -		return ret;
> -	}
> +	ret = cpuidle_add_sysfs(cpu_dev);
> +	if (ret)
> +		goto err_sysfs;
>  
>  	dev->registered = 1;
>  	return 0;
> +
> +err_sysfs:
> +	list_del(&dev->device_list);
> +	per_cpu(cpuidle_devices, dev->cpu) = NULL;
> +	module_put(cpuidle_driver->owner);
> +	return ret;
>  }
>  
>  /**
> 

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