[PATCH] ppc_sys: do not BUG if system ID is unknown

[Marcelo Tosatti <marcelo.tosatti@cyclades.com>]

Vitaly,

Subject and diff says it all: currently ppc_sys BUGs on unknown system
ID, which is quite unfriendly.

The following is applied to the 8xx-fixes tree.

diff-tree a807b39b11a2fc311d3bbeff2b6f17c31636bb58 (from 94c84a4faa99c5f1ca93f0b9c5ad3df9d57409f8)
Author: Marcelo Tosatti <marcelo@pegasos.cnet>
Date:   Wed Oct 26 14:43:30 2005 -0500

    ppc32: Make ppc_sys friendly to unknown system ID's

diff --git a/arch/ppc/syslib/ppc_sys.c b/arch/ppc/syslib/ppc_sys.c
index 52ba0c6..26d7605 100644
--- a/arch/ppc/syslib/ppc_sys.c
+++ b/arch/ppc/syslib/ppc_sys.c
@@ -85,8 +85,11 @@ static int __init find_chip_by_name_and_
 void __init identify_ppc_sys_by_name_and_id(char *name, u32 id)
 {
 	int i = find_chip_by_name_and_id(name, id);
-	BUG_ON(i < 0);
-	cur_ppc_sys_spec = &ppc_sys_specs[i];
+	if (i < 0) {
+		printk(KERN_ERR "ppc_sys: Unable to identify PPC system!\n");
+		cur_ppc_sys_spec = NULL;
+	} else
+		cur_ppc_sys_spec = &ppc_sys_specs[i];
 }
 
 /* Update all memory resources by paddr, call before platform_device_register */
@@ -128,7 +131,8 @@ static int __init ppc_sys_init(void)
 {
 	unsigned int i, dev_id, ret = 0;
 
-	BUG_ON(cur_ppc_sys_spec == NULL);
+	if(cur_ppc_sys_spec == NULL)
+		return 1;
 
 	for (i = 0; i < cur_ppc_sys_spec->num_devices; i++) {
 		dev_id = cur_ppc_sys_spec->device_list[i];