From: Prarit Bhargava <prarit@sgi.com>

I discovered an issue where a hwif_init() failure lead to /proc/ide files
being created for devices that failed probes.  This resulted in
oops/WARN_ON/BUG_ON executions through the kernel depending on what
actions were on going.

slightly changed by me (bart)
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>