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No functional change. Just introduce scsi_host_busy() and replace the direct read of scsi_host->host_busy with this new API. Cc: Omar Sandoval <[email protected]>, Cc: "Martin K. Petersen" <[email protected]>, Cc: James Bottomley <[email protected]>, Cc: Christoph Hellwig <[email protected]>, Cc: Don Brace <[email protected]> Cc: Kashyap Desai <[email protected]> Cc: Mike Snitzer <[email protected]> Cc: Hannes Reinecke <[email protected]> Cc: Laurence Oberman <[email protected]> Cc: Bart Van Assche <[email protected]> Signed-off-by: Ming Lei <[email protected]> Reviewed-by: Bart Van Assche <[email protected]> Signed-off-by: Martin K. Petersen <[email protected]>