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

Ian Dowse iedowse at
Wed Dec 7 19:08:27 PST 2005

iedowse     2005-12-08 03:08:17 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/usb          usbdi.c 
  Reorder the calling of the completion callback and the transfer
  "done" method so that for non-repeat operations we have completely
  finished with the transfer by the time the callback is invoked.
  This makes it possible to recycle a transfer from within the callback
  routine for the same transfer. Previously this almost worked, but
  with OHCI controllers calling the "done" method after the callback
  would zero out some important fields needed by the recycled transfer.
  Only some usb peripheral drivers such as ucom appear to rely on the
  ability to reuse a transfer from its callback.
  MFC after:      1 week
  Revision  Changes    Path
  1.92      +14 -10    src/sys/dev/usb/usbdi.c

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