linux-kernel - Re: No more "device" symlinks for classes

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Date:	Sun, 14 Jan 2007 01:29:51 +0100
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Kay Sievers <kay.sievers@...y.org>
CC:	Greg KH <greg@...ah.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: No more "device" symlinks for classes

Kay Sievers wrote:
>
> The plan is to have a single unified tree at /sys/devices, where all
> device-directories live below their parents, and /sys/class contains
> only symlinks pointing into this single tree, just like /sys/bus.
>
> People want to stack class-devices, but this leads to a /sys/devices
> tree and several small trees spread around in /sys/class. These trees
> need to be connected by "device"-links and the "class:"-links, which
> just doesn't make much sense if you can have one single tree with the
> same information.
>
> In the unified tree, the "device"-link will always just point to the
> parent device, that's why there is a config option to disable these
> links and test current software not to depend on it.
>
>   

I'm not sure I completely follow. Should an application look at the
symlink (e.g. /sys/class/fooclass/foodev -> /sys/devices/...) and follow
that one level up? If so, then this sounds a bit complicated. Especially
from shell scripts.

Rgds

-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org

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