linux-kernel - what is "temporary" about code in "__register_chrdev

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Date:	Fri, 17 Jul 2009 09:44:38 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...shcourse.ca>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: what is "temporary" about code in "__register_chrdev_region()"?


  i was just perusing the code for that routine in fs/char_dev.c and
noticed the label that some of that code was, well, temporary:

        /* temporary */     [line 99]
        if (major == 0) {
                for (i = ARRAY_SIZE(chrdevs)-1; i > 0; i--) {
                        if (chrdevs[i] == NULL)
                                break;
                }

                if (i == 0) {
                        ret = -EBUSY;
                        goto out;
                }
                major = i;
                ret = major;
        }

  so what's "temporary" about it?  that it can (dynamically) handle a
major number of zero?  is that supposed to represent a first step in
migrating to alloc_chrdev_region(), or what?  i'm just curious,

rday
--

========================================================================
Robert P. J. Day                               Waterloo, Ontario, CANADA

        Linux Consulting, Training and Annoying Kernel Pedantry.

Web page:                                          http://crashcourse.ca
Twitter:                                       http://twitter.com/rpjday
"Kernel Newbie Corner" column @ linux.com:          http://cli.gs/WG6WYX
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