Re: crash in init_ipic_sysfs on efika

I cant reproduce this bug on my board, but:

The global primary_ipic in arch/powerpc/sysdev/ipic.c can remain NULL if
ipic_init() fails. init_ipic_sysfs() will crash in that case.

Something like this may fix it:

Index: linux-2.6.25-rc6/arch/powerpc/sysdev/ipic.c
===================================================================

--- linux-2.6.25-rc6.orig/arch/powerpc/sysdev/ipic.c
+++ linux-2.6.25-rc6/arch/powerpc/sysdev/ipic.c

@@ -906,7 +906,7 @@ static int __init init_ipic_sysfs(void)

{
       int rc;

-       if (!primary_ipic->regs)
+       if (!primary_ipic || !primary_ipic->regs)
               return -ENODEV;
       printk(KERN_DEBUG "Registering ipic with sysfs...\n");