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blk-iocost: fix divide-by-zero in transfer_surpluses()
Conceptually, root_iocg->hweight_donating must be less than WEIGHT_ONE but all hweight calculations round up and thus it may end up >= WEIGHT_ONE triggering divide-by-zero and other issues. Bound the value to avoid surprises. Fixes: e08d02a ("blk-iocost: implement Andy's method for donation weight updates") Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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