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

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Date:	Mon, 6 Sep 2010 17:12:18 -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 04:39:14PM -0700, Nicholas A. Bellinger wrote:
> 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..
> 

And rightly so - you did not assign a value to it when handling
root_device_register() failure. Compiler warnings are generally there
for a reason, not just a nuisance that should be shut off without a
second thought.

-- 
Dmitry
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