From: Yongbae Park <yongbae2@xxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit 1096be084ac59927158ce80ff1d31c33eed0e565 ]
The interrupt is enabled before the handler is set. Even this bug
did not appear, it is potentially dangerous as it can lead to a
NULL pointer dereference.
Fix the error by enabling the interrupt after
clockevents_config_and_register() is called.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Yongbae Park <yongbae2@xxxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
drivers/clocksource/timer-sun5i.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/clocksource/timer-sun5i.c b/drivers/clocksource/timer-sun5i.c
index 0226844..5dcbf90 100644
--- a/drivers/clocksource/timer-sun5i.c
+++ b/drivers/clocksource/timer-sun5i.c
@@ -178,10 +178,6 @@ static void __init sun5i_timer_init(struct device_node *node)
ticks_per_jiffy = DIV_ROUND_UP(rate, HZ);
- ret = setup_irq(irq, &sun5i_timer_irq);
- if (ret)
- pr_warn("failed to setup irq %d\n", irq);
-
/* Enable timer0 interrupt */
val = readl(timer_base + TIMER_IRQ_EN_REG);
writel(val | TIMER_IRQ_EN(0), timer_base + TIMER_IRQ_EN_REG);
@@ -191,6 +187,10 @@ static void __init sun5i_timer_init(struct device_node *node)
clockevents_config_and_register(&sun5i_clockevent, rate,
TIMER_SYNC_TICKS, 0xffffffff);
+
+ ret = setup_irq(irq, &sun5i_timer_irq);
+ if (ret)
+ pr_warn("failed to setup irq %d\n", irq);
}
CLOCKSOURCE_OF_DECLARE(sun5i_a13, "allwinner,sun5i-a13-hstimer",
sun5i_timer_init);
--
2.1.0
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