how to get rid of scsi cdrom?

What is the best way to fix this oops?
'rmmod -r ide-cd;modprobe ide-scsi;modprobe sr_mod;rmmod -r ide-scsi'

cdrom_mrw_exit() calls scsi_block_when_processing_errors() at some point, that looks like the only exit before the oops, via SDEV_OFFLINE. However, scsi_remove_host() sets SDEV_CANCEL first, so it looks like SDEV_OFFLINE isnt a valid state anymore.