linux-kernel - Re: [PATCH 1/2] chrdev: implement __[un]register

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Message-ID: <20090805164919.GA27457@kroah.com>
Date:	Wed, 5 Aug 2009 09:49:19 -0700
From:	Greg KH <greg@...ah.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Al Viro <viro@....linux.org.uk>, Takashi Iwai <tiwai@...e.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	cguthrie@...driva.org
Subject: Re: [PATCH 1/2] chrdev: implement __[un]register_chrdev()

On Thu, Aug 06, 2009 at 01:30:30AM +0900, Tejun Heo wrote:
> Greg KH wrote:
> > On Wed, Aug 05, 2009 at 03:35:42PM +0900, Tejun Heo wrote:
> >> [un]register_chrdev() assume minor range 0-255.  This patch adds __
> >> prefixed versions which take @minorbase and @count explicitly.
> > 
> > What's the difference between this and the existing
> > register_chrdev_region() function?  Why doesn't that work for you?
> > 
> > What am I missing here?
> 
> The function names in char_dev.c are quite confusing.

That's an understatement :)


> register_chrdev_region() only registers chrdev region.
> register_chrdev() registers chrdev region and creates a cdev for the
> region.  :-)

Yes, but you can use register_chrdev_region() and then call cdev_alloc()
for the specific cdevs you need, right?  It's not the prettiest, but it
should work.

thanks,

greg k-h
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