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

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Date:	Wed, 5 Aug 2009 10:15:47 -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 02:01:56AM +0900, Tejun Heo wrote:
> Greg KH wrote:
> > 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 :)
> 
> Yeah, it sure is.  It should have used a different verb at the very
> least.
> 
> >> 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.
> 
> Yeap, I can.  That's basically what register_chrdev() is.  If it had a
> better name, adding a new variant would have been much nicer.  Having
> the helper makes sense tho.  Names too confusing?

Yes the names are confusing, the whole api needs a rework to make it
easier to understand :(

thanks,

greg k-h
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