On Tue, Dec 06, 2005 at 12:37:57AM +0100, Andreas Jellinghaus wrote:
> Hi,
> 
> oh, shiny new device files. but why? /proc/bus/usb/00X/00Y
> works fine for me. why the changes?

Because udev can control the permissions of these device nodes properly,
while usbfs had a file-system-wide granularity for permissions.

> will usbfs alias /proc/bus/usb be obsoleted?

It's been considered that /proc/bus/usb be obsoleted, and some distros
have not mounted it at all as the device nodes provide the same
interface (and are still really usbfs underneath.)

> also are there any differences between those two files?
> or are they exchangeable?

They are the same.

> also what about the hotplug interface and udev?
> I hope I can still count on $DEVICE being the
> /proc/bus/usb/ device when my hotplug script
> is being called?

Yes.

thanks,

greg k-h


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