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

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Date:	Sun, 14 Jan 2007 09:46:02 +0100
From:	"Kay Sievers" <kay.sievers@...y.org>
To:	"Greg KH" <greg@...ah.com>
Cc:	"Andrey Borzenkov" <arvidjaar@...l.ru>,
	"Pierre Ossman" <drzeus-list@...eus.cx>,
	linux-kernel@...r.kernel.org
Subject: Re: No more "device" symlinks for classes

On 1/14/07, Greg KH <greg@...ah.com> wrote:
> On Sun, Jan 14, 2007 at 09:10:59AM +0300, Andrey Borzenkov wrote:
> > Pierre Ossman wrote:
> >
> > > Hi guys,
> > >
> > > 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.
> > >
> >
> > Actually I wonder why those links still present even when I told system not
> > to create them?
> >
> > {pts/1}% grep DEPRE /boot/config
> > # CONFIG_SYSFS_DEPRECATED is not set
> > # CONFIG_PM_SYSFS_DEPRECATED is not set
> > {pts/1}% find /sys/class -name device
> > /sys/class/pcmcia_socket/pcmcia_socket2/device
> > /sys/class/pcmcia_socket/pcmcia_socket1/device
> > /sys/class/pcmcia_socket/pcmcia_socket0/device
> > /sys/class/usb_device/usbdev1.1/device
> > /sys/class/usb_host/usb_host1/device
> > /sys/class/scsi_disk/0:0:0:0/device
> > /sys/class/scsi_device/1:0:0:0/device
> > /sys/class/scsi_device/0:0:0:0/device
> > /sys/class/scsi_host/host1/device
> > /sys/class/scsi_host/host0/device
> > /sys/class/net/eth0/device
> > /sys/class/net/eth1/device
> > /sys/class/input/input1/ts0/device
> > /sys/class/input/input1/mouse0/device
> > /sys/class/input/input1/event1/device
> > /sys/class/input/input1/device
> > /sys/class/input/input0/event0/device
> > /sys/class/input/input0/device
> > {pts/1}% uname -a
> > Linux cooker 2.6.20-rc5-1avb #10 Sat Jan 13 14:05:34 MSK 2007 i686 Pentium
> > III (Coppermine) GNU/Linux
>
> Because I haven't finished converting all of the different usages of
> struct class_device to struct device just yet.  When that happens, those
> links go away, as the /sys/class/foo_class/foo is a symlink itself into
> the /sys/devices/ tree.

Right, you only told not to create the links for already converted
subsystems to create the class-devices in /sys/devices. You can never
supress the links for subsystems which still create device-directories
in /sys/class, because you would lose the parent information then and
udev and HAL couldn't work anymore.

Kay
Kay
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