tree 5b849ae049afd7d60c259b8fc2af83ff7ef97856
parent 654897a8e890cf443d803f29d8bd55c43a36b83a
author Barret Rhoden <brho@cs.berkeley.edu> 1531846986 -0400
committer Barret Rhoden <brho@cs.berkeley.edu> 1531847237 -0400

9ns: Fix concurrent TF removal bug

If you had two threads removing a child from a parent at the same time,
get_locked_and_kreffed_parent() would return a TF that was not the
parent of the child.  I think the check for child->parent was from before I
deferred clearning ->parent until __tf_free().

Signed-off-by: Barret Rhoden <brho@cs.berkeley.edu>