linux-kernel - bus_id collisions

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Message-Id: <1164081736.8207.14.camel@localhost.localdomain>
Date:	Tue, 21 Nov 2006 15:02:16 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Greg KH <greg@...ah.com>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: bus_id collisions

Hi Greg !

It occurs to me (after some trouble I had with custom bus types) that
this comment is incorrect in device.h, in the definition of struct
device :

        char    bus_id[BUS_ID_SIZE];    /* position on parent bus */

As the bus_id needs to be unique for a given bus_type, not only under a
given parent, due to the symlinks in /sys/bus/<bus_type>/.

This has caused me some trouble with of_platform devices, which are
sort-of platform devices but linked to the Open Firmware device-tree, as
I generate their names based on the nodes in the tree which need not be
unique as long as they are unique under a given parent.

I've worked around it, but I though the comment might need to be
clarified.

Also, I don't suppose you have any plan to move away from the bus_id
being a fixed size array inside struct device ? I would very much like
to be able to have larger names ... Among others, in order to handle the
above problem, I tend to include the fully translated 64 bits address of
the device in the name :-) (Hopefully, it's generally smaller and I
don't have leading zero's but still, I have little room left for the
device name which is annoying).

Cheers,
Ben.

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