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>

diff --git a/arch/microblaze/kernel/intc.c b/arch/microblaze/kernel/intc.c
index b156052..6eea6f9 100644 (file)
--- a/arch/microblaze/kernel/intc.c
+++ b/arch/microblaze/kernel/intc.c
@@ -12,6 +12,7 @@
 #include <linux/irq.h>
 #include <asm/page.h>
 #include <linux/io.h>
+#include <linux/bug.h>
 
 #include <asm/prom.h>
 #include <asm/irq.h>
@@ -130,6 +131,7 @@ void __init init_IRQ(void)
                if (intc)
                        break;
        }
+       BUG_ON(!intc);
 
        intc_baseaddr = *(int *) of_get_property(intc, "reg", NULL);
        intc_baseaddr = (unsigned long) ioremap(intc_baseaddr, PAGE_SIZE);

diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
index bdfa2f9..5499dea 100644 (file)
--- 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);