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When a vport is deleted, the maximum headroom size would be changed. If the vport which has the largest headroom is deleted, the new max_headroom would be set. But, if the new headroom size is equal to the old headroom size, updating routine is unnecessary. Signed-off-by: Taehee Yoo <[email protected]> Tested-by: Greg Rose <[email protected]> Reviewed-by: Greg Rose <[email protected]> Signed-off-by: David S. Miller <[email protected]>