pata_cm64x: fix boot crash on parisc
commit811dfd3f3d8304443b9dc5a74a953f1b907e6129
authorJames Bottomley <James.Bottomley@suse.de>
Sun, 24 Apr 2011 19:30:14 +0000 (24 14:30 -0500)
committerGreg Kroah-Hartman <gregkh@suse.de>
Fri, 3 Jun 2011 01:33:51 +0000 (3 10:33 +0900)
treef785696439fe3abb60b78eeb0b7dc3ce24b8b862
parenteb83cf2f0101005e98c65dbe04d8d83361e93a21
pata_cm64x: fix boot crash on parisc

commit 9281b16caac1276817b77033c5b8a1f5ca30102c upstream.

The old IDE cmd64x checks the status of the CNTRL register to see if
the ports are enabled before probing them.  pata_cmd64x doesn't do
this, which causes a HPMC on parisc when it tries to poke at the
secondary port because apparently the BAR isn't wired up (and a
non-responding piece of memory causes a HPMC).

Fix this by porting the CNTRL register port detection logic from IDE
cmd64x.  In addition, following converns from Alan Cox, add a check to
see if a mobility electronics bridge is the immediate parent and forgo
the check if it is (prevents problems on hotplug controllers).

Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/ata/pata_cmd64x.c
include/linux/pci_ids.h