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From: Kay Sievers <>
To: Pierre Ossman <>
Cc: Greg KH <>, LKML <>
Subject: Re: No more "device" symlinks for classes
Date: Sun, 14 Jan 2007 01:02:41 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Sun, 2007-01-14 at 00:51 +0100, Pierre Ossman wrote:
> I just wanted to know the rationale behind
> 99ef3ef8d5f2f5b5312627127ad63df27c0d0d05 (no more "device" symlink in
> class devices). I thought that was a rather convenient way of finding
> which physical device the class device was coupled to.

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.

There was a long discussion on lkml about all that, maybe a year ago,
while converting "input".


  reply	other threads:[~2007-01-14  0:02 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-13 23:51 Pierre Ossman
2007-01-14  0:02 ` Kay Sievers [this message]
2007-01-14  0:29   ` Pierre Ossman
2007-01-14  0:35     ` Kay Sievers
2007-01-14  6:10 ` Andrey Borzenkov
2007-01-14  7:39   ` Greg KH
2007-01-14  8:46     ` Kay Sievers

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