cfq-iosched: Don't update group weights when on service tree
Version 3 is updated to apply to for-2.6.39/core. For version 2, I took Vivek's advice and made sure we update the group weight from cfq_group_service_tree_add(). If a weight was updated while a group is on the service tree, the calculation for the total weight of the service tree can be adjusted improperly, which either leads to bad service tree weights, or potentially crashes (if total_weight becomes 0). This patch defers updates to the weight until a group is off the service tree. Signed-off-by: NJustin TerAvest <teravest@google.com> Acked-by: NVivek Goyal <vgoyal@redhat.com> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
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