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From: Andrew Thompson <thompsa@FreeBSD.org>
Date: Sun, 8 Nov 2009 20:51:15 +0000 (UTC)
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Subject: cvs commit: src/sys/dev/usb/controller ehci.c ehci.h ehci_pci.c
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thompsa     2009-11-08 20:51:15 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/usb/controller ehci.c ehci.h ehci_pci.c 
  Log:
  SVN rev 199058 on 2009-11-08 20:51:15Z by thompsa
  
  Integrate lost interrupts patch from the old USB stack.
  
  Some EHCI chips from VIA / ATI seem to trigger interrupts before writing back
  the qTD status, or miss signalling occasionally under heavy load.  If the host
  machine is too fast, we can miss transaction completion - when we scan the
  active list the transaction still seems to be active. This generally exhibits
  itself as a umass stall that never recovers.
  
  We work around this behaviour by setting up this callback after any softintr
  that completes with transactions still pending, giving us another chance to
  check for completion after the writeback has taken place
  
  Submitted by:   Alexander Nedotsuko
  MFC after:      3 days
  
  Revision  Changes    Path
  1.30      +36 -4     src/sys/dev/usb/controller/ehci.c
  1.10      +2 -0      src/sys/dev/usb/controller/ehci.h
  1.14      +13 -0     src/sys/dev/usb/controller/ehci_pci.c