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

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Date:	Mon, 27 Nov 2006 12:46:07 -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 Mon, Nov 27, 2006 at 12:34:52PM -0800, Mark Gross wrote:
> 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 *
My bad.  I was looking at the earlier ret = EBUSY, this is ok.

> >  		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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> -
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