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

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Message-ID: <20100921210809.GA28026@kroah.com>
Date:	Tue, 21 Sep 2010 14:08:09 -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 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.

thanks,

greg k-h
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