linux-kernel - Re: register_chrdev vs. cdev

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Message-ID: <16204.1210773695@vena.lwn.net>
Date:	Wed, 14 May 2008 08:01:35 -0600
From:	corbet@....net (Jonathan Corbet)
To:	Hinko Kočevar <hinko.kocevar@...rtapot.si>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: register_chrdev vs. cdev_add 

> dev = MKDEV(htrc110_major, htrc110_minor);
> ret = register_chrdev_region(dev, 1, mod_name);
> ret = register_chrdev(dev, mod_name, &htrc110_fops);

If you want to use register_chrdev(), do not make a separate call to
register_chrdev_region().  Those two are not meant to work together.
register_chrdev() implicitly allocates a region of 256 minors for you.

jon
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