On Mon, Nov 10, 2008 at 07:45:28PM -0500, Alan Stern wrote:

On Tue, 11 Nov 2008, Andi Kleen wrote:

quoted

Hi,

I have a box here which has a couple of USB devices connected.
That includes several HID devices (keyboards, mouse) and a couple
of others including a USB powerswitch driven through a user space
program.

Now what happened is that I changed some of the HID devices
around (moving from a direct port to a hub) and also moved
the USB power switch from one port to another. But after that
the power switch didn't work anymore, just giving a flood 
of

usb 2-2: usbfs: interface 0 claimed by usbhid while 'sispm' sets config #1

(sispm is the user space driver)

Kernel is 2.6.28-rc3

This sounds like a userspace problem.  The sispm program should unbind 
usbhid from interface 0 before trying to set the config.

Can you please explain in layman's terms why usbhid does not 
unbind itself when it detects the removal of a device? 

Why should sispm need to unbind someone else?

-Andi

-- 
ak@linux.intel.com