linux-kernel - Re: [PATCH] leds-ss4200: fix led_classdev

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Message-Id: <1274111134.21875.4909.camel@nimitz>
Date:	Mon, 17 May 2010 08:45:34 -0700
From:	Dave Hansen <dave@...1.net>
To:	Axel Lin <axel.lin@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Rodney Girod <rgirod@...focus.com>,
	Richard Purdie <rpurdie@...ux.intel.com>
Subject: Re: [PATCH] leds-ss4200: fix led_classdev_unregister twice in
 error handling

On Mon, 2010-05-17 at 13:42 +0800, Axel Lin wrote:
> In current implementation, if device_create_file failed in
> register_nasgpio_led,
> led_classdev_unregister will be executed twice.
> ( in register_nasgpio_led it calls led_classdev_unregister before
> return and in nas_gpio_init out_err )
> 
> This patch fixes it by only unregistering those that were successfully
> registered in out_err.
> ( not including last failed register_nasgpio_led call )

Did you actually run into this, or did you find this just auditing code?

> diff --git a/drivers/leds/leds-ss4200.c b/drivers/leds/leds-ss4200.c
> index 51477ec..a688293 100644
> --- a/drivers/leds/leds-ss4200.c
> +++ b/drivers/leds/leds-ss4200.c
> @@ -534,7 +534,7 @@ static int __init nas_gpio_init(void)
>  	set_power_light_amber_noblink();
>  	return 0;
>  out_err:
> -	for (; i >= 0; i--)
> +	for (i--; i >= 0; i--)
>  		unregister_nasgpio_led(i);
>  	pci_unregister_driver(&nas_gpio_pci_driver);
>  	return ret;

That i-- took me a minute to grok, but there isn't something immensely
better here.  If you have to resubmit these somehow, please add a
comment there.  But, otherwise, 

Acked-by: Dave Hansen <dave@...1.net>

-- Dave

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