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The checks for a valid input values are mixed with the logic to insert a newly allocated nport. Refactor the function so that first the checks are done. This allows to untangle the setup steps into a more linear form which reduces the complexity of the functions. Also start tracking lport when a lport is assigned to a nport. This ensures, that the lport is not going away as long it is still referenced by a nport. Signed-off-by: Daniel Wagner <wagi@kernel.org> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Christoph Hellwig <hch@lst.de>