Fix up locking for IPoIB path table.  Make sure that destruction of address
handles, neighbour info and path structs is locked properly to avoid races and
deadlocks.  (Problem originally diagnosed by Shirley Ma)
Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>