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writeback: remove broken rbtree_postorder_for_each_entry_safe() usage…
… in cgwb_bdi_destroy() a20135f ("writeback: don't drain bdi_writeback_congested on bdi destruction") added rbtree_postorder_for_each_entry_safe() which is used to remove all entries; however, according to Cody, the iterator isn't safe against operations which may rebalance the tree. Fix it by switching to repeatedly removing rb_first() until empty. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Cody P Schafer <dev@codyps.com> Fixes: a20135f ("writeback: don't drain bdi_writeback_congested on bdi destruction") Link: http://lkml.kernel.org/g/1443997973-1700-1-git-send-email-dev@codyps.com Signed-off-by: Jens Axboe <axboe@fb.com>
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