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

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Message-Id: <1283816354.556.251.camel@haakon2.linux-iscsi.org>
Date:	Mon, 06 Sep 2010 16:39:14 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
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, 2010-09-06 at 16:41 -0700, Dmitry Torokhov wrote:
> 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.

The reason this was added because my gcc (Debian 4.3.2-1.1) 4.3.2
complained about this being possibily uninitialized..

> 
> >  	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.

<nod> Updating that now.

Thanks,

--nab


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