cvs commit: src/sys/dev/usb usb.c

Ian Dowse iedowse at
Mon May 22 18:28:08 PDT 2006

iedowse     2006-05-23 01:27:23 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/usb          usb.c 
  When usb_event_thread() first starts, wait significantly longer
  before starting exploring (4 seconds), and extend the wait period
  if new USB buses are attached while waiting.
  This works around a problem seen when there is more than one EHCI
  controller in the system and you kldload usb.ko after the system
  has booted. The problem is that usb.ko contains 3 separate PCI
  drivers which get initialised one by one (uhci, ohci, ehci), and
  when each driver is initialised, all PCI buses are re-probed after
  just the addition of that driver. This means that there can be a
  significant delay between the attaching of a companion controller
  and the subsequent EHCI attach, so it is possible for the companion
  controller's USB 1.x bus to be scanned before the EHCI driver gets
  a chance to check if there is really a USB 2.x device connected.
  Revision  Changes    Path
  1.108     +14 -5     src/sys/dev/usb/usb.c

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