Here's a fix on top of the patch you commited:

  - Rename ide_intr_lock to falconide_intr_lock
  - Add falconide_intr_lock to the Falcon IDE driver itself
  - Test for CONFIG_BLK_DEV_FALCON_IDE instead of CONFIG_ATARI since
    falconide_intr_lock is Falcon IDE-specific, not Atari-specific