Subject: Re: maple_attach_dev
To: None <email@example.com>
From: Marcus Comstedt <firstname.lastname@example.org>
Date: 03/17/2001 05:59:41
>>>>> "Jason" == Jason R Thorpe <email@example.com> writes:
Jason> It all seems reasonable.
Jason> But, there isn't much of a way to assign units as you describe, without
Jason> some additional layer of indirection.
What is really important is that minor dev number is dependent on
position and not just sequence number. Assume you have one device X
plugged into port A and one device Y plugged into port C. If you
unplug device X, you don't want device Y to be renumbered, and when
you plug it back into port B, you don't want to a new device number
greater than that of device Y¹. This is all assuming working
hotplugging/unplugging of maple devices, which we don't have right now
but which I assume is simple enough to implement as it should be
needed already for things like USB.
¹ The reason being, that if you get new higher device numbers each
time you unplug and replug, you'll soon run out of any number of
premade device nodes in /dev.