microblaze: Sane handling of missing timer/intc in device tree

This code path doesn't test any returned pointers for NULL, leading to a bad
kernel page fault if there's no timer/intc found.

Slightly better is to BUG(), but even better still would be a printk beforehand.

Signed-off-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
index bdfa2f9f0c81..5499deae7fa6 100644
--- a/arch/microblaze/kernel/timer.c
+++ b/arch/microblaze/kernel/timer.c
@@ -22,6 +22,7 @@
 #include <linux/clocksource.h>
 #include <linux/clockchips.h>
 #include <linux/io.h>
+#include <linux/bug.h>
 #include <asm/cpuinfo.h>
 #include <asm/setup.h>
 #include <asm/prom.h>
@@ -234,6 +235,7 @@ void __init time_init(void)
                 if (timer)
                         break;
         }
+        BUG_ON(!timer);
 
         timer_baseaddr = *(int *) of_get_property(timer, "reg", NULL);
         timer_baseaddr = (unsigned long) ioremap(timer_baseaddr, PAGE_SIZE);