linux-kernel - Re: [PATCH] tlclk: fix platform_device_register

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Date:	Mon, 27 Nov 2006 12:34:52 -0800
From:	Mark Gross <mgross@...ux.intel.com>
To:	Akinobu Mita <akinobu.mita@...il.com>,
	linux-kernel@...r.kernel.org,
	Sebastien Bouchard <sebastien.bouchard@...kontron.com>,
	akpm@...l.org
Subject: Re: [PATCH] tlclk: fix platform_device_register_simple() error check

On Thu, Nov 23, 2006 at 03:41:11AM +0900, Akinobu Mita wrote:
> The return value of platform_device_register_simple() should be
> checked by IS_ERR().
> 
> This patch also fix misc_register() error case. Because misc_register()
> returns error code.
> 
> Cc: Sebastien Bouchard <sebastien.bouchard@...kontron.com>
> Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
> 
> ---
>  drivers/char/tlclk.c |    5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> Index: work-fault-inject/drivers/char/tlclk.c
> ===================================================================
> --- work-fault-inject.orig/drivers/char/tlclk.c
> +++ work-fault-inject/drivers/char/tlclk.c
> @@ -792,15 +792,14 @@ static int __init tlclk_init(void)
>  	ret = misc_register(&tlclk_miscdev);
>  	if (ret < 0) {
>  		printk(KERN_ERR "tlclk: misc_register returns %d.\n", ret);
> -		ret = -EBUSY;

results in an non-error return when there this device isn't on the
system.

* NAK *
>  		goto out3;
>  	}
>  
>  	tlclk_device = platform_device_register_simple("telco_clock",
>  				-1, NULL, 0);
> -	if (!tlclk_device) {
> +	if (IS_ERR(tlclk_device)) {
ok

>  		printk(KERN_ERR "tlclk: platform_device_register failed.\n");
> -		ret = -EBUSY;
> +		ret = PTR_ERR(tlclk_device);

I don't know about this but I could be wrong.  Please convince me.

>  		goto out4;
>  	}
>  
> -
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