Re: [PATCH] scsi_debug: Convert to use root_device_register() and root_device_unregister()

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

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