[PATCH 2.6.22] Fix powermac late initcall to only run when required.

[Tony Breeds]

From: Tony Breeds <tony at bakeyournoodle.com>

Fix powermac late initcall to only run when required.

Current ppc64_defconfig kernel fail to boo on iSeries dieing with:
---
NET: Registered protocol family 17
Unable to handle kernel paging request for data at address 0x00000000
Faulting instruction address: 0xc00000000071b258
Oops: Kernel access of bad area, sig: 11 [#1]
SMP NR_CPUS=32 iSeries
<snip>
NIP [c00000000071b258] .iSeries_src_init+0x34/0x64
LR [c000000000701bb4] .kernel_init+0x1fc/0x3bc
Call Trace:
[c000000007d0be30] [0000000000008000] 0x8000 (unreliable)
[c000000007d0bea0] [c000000000701bb4] .kernel_init+0x1fc/0x3bc
[c000000007d0bf90] [c0000000000262d4] .kernel_thread+0x4c/0x68
Instruction dump:
e922cba8 3880ffff 78840420 f8010010 f821ff91 60000000 e8090000 78095fe3 
4182002c e922cb58 e862cbb0 e9290140 <e8090000> f8410028 7c0903a6 e9690010 
Kernel panic - not syncing: Attempted to kill init!
---

This is because powermac is unconditionally sets ppc_md.progress to NULL.
This patch makes sure the powermac late initcall is only run on powermac
machines.

Signed-off-by: Tony Breeds <tony at bakeyournoodle.com>

---

 arch/powerpc/platforms/powermac/setup.c |    3 +++
 1 file changed, 3 insertions(+)

Index: working/arch/powerpc/platforms/powermac/setup.c
===================================================================
--- working.orig/arch/powerpc/platforms/powermac/setup.c	2007-06-20 14:55:27.000000000 +1000
+++ working/arch/powerpc/platforms/powermac/setup.c	2007-06-20 14:59:48.000000000 +1000
@@ -454,6 +454,9 @@ static int initializing = 1;
 
 static int pmac_late_init(void)
 {
+	if (!machine_is(powermac))
+		return -ENODEV;
+
 	initializing = 0;
 	/* this is udbg (which is __init) and we can later use it during
 	 * cpu hotplug (in smp_core99_kick_cpu) */