[Bug 156596] [ehci] Extremely high interrupt rate on ehci/uhci IRQ16 80% cpu utilization on CPU0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=156596

--- Comment #18 from commit-hook at freebsd.org ---
A commit references this bug:

Author: hselasky
Date: Tue Feb 17 07:52:51 UTC 2015
New revision: 278883
URL: https://svnweb.freebsd.org/changeset/base/278883

Log:
  Try to resolve infinite interrupts by clearing an undocumented
  interrupt status bit. According to the UHCI controller specification
  the host controller halted interrupt is non-maskable.

  PR:        156596
  Tested by:    adrian @
  MFC after:    1 week

Changes:
  head/sys/dev/usb/controller/uhci.c

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