K 10 svn:author V 3 mav K 8 svn:date V 27 2009-11-17T20:49:26.237989Z K 7 svn:log V 352 MFC r198748, r198782: Fix reference counting bug, when device unreferenced before invalidated. To do it, do not handle validity flag as another reference, but explicitly modify reference count each time flag is modified. The async callback could free the device. If it is a broadcast async, it doesn't hold device reference, so take our own reference. END