linux-kernel - Re: [PATCH] scsi_debug: Convert to use root_device_register() and root_device

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Date:	Mon, 6 Sep 2010 16:41:19 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Douglas Gilbert <dgilbert@...erlog.com>,
	Richard Sharpe <realrichardsharpe@...il.com>,
	Christoph Hellwig <hch@....de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Mike Christie <michaelc@...wisc.edu>,
	Hannes Reinecke <hare@...e.de>,
	James Bottomley <James.Bottomley@...e.de>,
	Greg KH <greg@...ah.com>
Subject: Re: [PATCH] scsi_debug: Convert to use root_device_register() and
 root_device_unregister()

On Mon, Sep 06, 2010 at 03:32:20PM -0700, Nicholas A. Bellinger wrote:
>  static int __init scsi_debug_init(void)
>  {
>  	unsigned long sz;
>  	int host_to_add;
>  	int k;
> -	int ret;
> +	int ret = 0;
>  

Please do not initialize error condition with success; when adding
additional initialization it makes easy to miss assigning proper return
value (as you seem to have) and return success in case of failure.

>  	switch (scsi_debug_sector_size) {
>  	case  512:
> @@ -3352,10 +3343,9 @@ static int __init scsi_debug_init(void)
>  			map_region(0, 2);
>  	}
>  
> -	ret = device_register(&pseudo_primary);
> -	if (ret < 0) {
> -		printk(KERN_WARNING "scsi_debug: device_register error: %d\n",
> -			ret);
> +	pseudo_primary = root_device_register("pseudo_0");
> +	if (!(pseudo_primary)) {

root_device_register() returns ERR_PTR-encoded error codes, you should
do:

	if (IS_ERR(pseudo_primary)) {
		printk(KERN_WARNING "scsi_debug: root_device_register() error\n");
		ret = PTR_ERR(pseudo_primary);
		goto free_vm;
	}

Same goes for your other patch.

Thanks.

-- 
Dmitry
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