cdb53b65ae1b ("IB/umad: Use class_groups and let core create class file")
900d07c12d4e ("IB/umad: Simplify and avoid dynamic allocation of class")
8cf12d7780b7 ("IB/core: Increase number of char device minors")
008b656f4298 ("IB/core: Remove the locking for character device bitmaps")