linux-kernel - Re: [PATCH 4/5] uio: Support 2^MINOR

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Date:	Tue, 21 Sep 2010 14:56:50 -0700
From:	Greg KH <greg@...ah.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	"Hans J. Koch" <hjk@...utronix.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] uio: Support 2^MINOR_BITS minors

On Tue, Sep 21, 2010 at 11:38:26PM +0200, Thomas Gleixner wrote:
> On Tue, 21 Sep 2010, Greg KH wrote:
> 
> > On Fri, Sep 17, 2010 at 10:36:50PM +0200, Thomas Gleixner wrote:
> > > On Tue, 14 Sep 2010, Eric W. Biederman wrote:
> > > 
> > > > 
> > > > register_chrdev limits uio devices to 256 minor numbers which causes
> > > > problems on one system I have with 384+ uio devices.  So instead set
> > > > UIO_MAX_DEVICES to the maximum number of minors and use
> > > > alloc_chrdev_region to reserve the uio minors.
> > > > 
> > > > The final result is that the code works the same but the uio driver now
> > > > supports any minor the idr allocator comes up with.
> > > > 
> > > > Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com>
> > > 
> > > One minor nit:
> > > 
> > > > +	result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name);
> > > > +	if (result)
> > > > +		goto out;
> > > 
> > >   		return result;
> > 
> > Wait, why?  It's the exact came code, as out does:
> > 
> > out:
> > 	return result;
> > 
> > and you need that line due to the code above it.  So I say leave it.
> 
> s/goto out/return result/g
> 
> Gotos which end up in a single line "return foo;" are pretty pointless.

Ok, fair enough, but it's not a big deal, right?

thanks,

greg k-h
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