x86: fix kernel crash on geode devices (#21667)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@48428 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/x86/patches-4.4/100-fix_cs5535_clockevt.patch b/target/linux/x86/patches-4.4/100-fix_cs5535_clockevt.patch
new file mode 100644 (file)
index 0000000..c49ddca
--- /dev/null
+++ b/target/linux/x86/patches-4.4/100-fix_cs5535_clockevt.patch
@@ -0,0 +1,12 @@
+--- a/drivers/clocksource/cs5535-clockevt.c
++++ b/drivers/clocksource/cs5535-clockevt.c
+@@ -129,7 +129,8 @@ static irqreturn_t mfgpt_tick(int irq, v
+               cs5535_mfgpt_write(cs5535_event_clock, MFGPT_REG_SETUP,
+                               MFGPT_SETUP_CNTEN | MFGPT_SETUP_CMP2);
+ 
+-      cs5535_clockevent.event_handler(&cs5535_clockevent);
++      if (cs5535_clockevent.event_handler)
++              cs5535_clockevent.event_handler(&cs5535_clockevent);
+       return IRQ_HANDLED;
+ }
+