device number increasing in /proc/bus/usb ?

device number increasing in /proc/bus/usb ?

[wwp]

Hi hotplug folks,


is it normal that device number increases each time I unplug/plug
an USB mouse? For instance: first plug shows /proc/bus/usb/xxx/nnn,
an each time I unplug/replug the device, nnn increases.


TIA,

-- 
wwp


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Re: device number increasing in /proc/bus/usb ?

[Randy.Dunlap]

On Sun, 23 Nov 2003 00:27:18 +0100 wwp <subscript@free.fr> wrote:

| Hi hotplug folks,
| 
| 
| is it normal that device number increases each time I unplug/plug
| an USB mouse? For instance: first plug shows /proc/bus/usb/xxx/nnn,
| an each time I unplug/replug the device, nnn increases.

Yes, the USB subsystem doesn't reuse device numbers immediately.
Instead it assigns them in a round-robin manner, up to 127, then
restarting back at the low end with unassigned numbers.

--
~Randy


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