crash in init_ipic_sysfs on efika

[Olaf Hering]

On Mon, Mar 17, Olaf Hering wrote:

> 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");

ipic_init() is not called for every board.
This change for the used config fixes the crash as well.

@@ -168,14 +168,14 @@ CONFIG_PPC_MULTIPLATFORM=y
 # CONFIG_PPC_86xx is not set
 CONFIG_CLASSIC32=y
 CONFIG_PPC_CHRP=y
-CONFIG_PPC_MPC512x=y
-CONFIG_PPC_MPC5121=y
-CONFIG_MPC5121_ADS=y
+# CONFIG_PPC_MPC512x is not set
+# CONFIG_PPC_MPC5121 is not set
+# CONFIG_MPC5121_ADS is not set
 CONFIG_PPC_MPC52xx=y
-CONFIG_PPC_MPC5200_SIMPLE=y
+# CONFIG_PPC_MPC5200_SIMPLE is not set
 CONFIG_PPC_EFIKA=y
 # CONFIG_PPC_LITE5200 is not set
-CONFIG_PPC_MPC5200_BUGFIX=y
+# CONFIG_PPC_MPC5200_BUGFIX is not set
 CONFIG_PPC_PMAC=y
 # CONFIG_PPC_CELL is not set
 # CONFIG_PPC_CELL_NATIVE is not set