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1678ec00a6
do add_timer() *before* unlocking dev->lock, or unpleasant things can happen if misdn_del_timer() on another CPU finds the sucker, calls del_timer_sync() (which does nothing, since we hadn't started the timer yet) and frees it, just as we get around to add_timer()... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>