now that usb_wait_task() is back, bring back recently reverted

changes:

* use usb_ref_{incr,decr,wait}() to avoid detaching the driver while a
  process is still using the hardware.
* don't add timeout(9)s if the device is detached.
* add checks to see if the device has been detached before running
  ioctls, timeouts, and tasks.
* use usb_wait_task() to wait for tasks to complete.

ok damien@

0 files changed, 0 insertions, 0 deletions