Commit b53e7d00 authored by Chen-Yu Tsai's avatar Chen-Yu Tsai Committed by Daniel Lezcano

clocksource/drivers/sun4i: Clear interrupts after stopping timer in probe function

The bootloader (U-boot) sometimes uses this timer for various delays.
It uses it as a ongoing counter, and does comparisons on the current
counter value. The timer counter is never stopped.

In some cases when the user interacts with the bootloader, or lets
it idle for some time before loading Linux, the timer may expire,
and an interrupt will be pending. This results in an unexpected
interrupt when the timer interrupt is enabled by the kernel, at
which point the event_handler isn't set yet. This results in a NULL
pointer dereference exception, panic, and no way to reboot.

Clear any pending interrupts after we stop the timer in the probe
function to avoid this.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarChen-Yu Tsai <wens@csie.org>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
parent 4d0e7016
......@@ -123,12 +123,16 @@ static struct clock_event_device sun4i_clockevent = {
.set_next_event = sun4i_clkevt_next_event,
};
static void sun4i_timer_clear_interrupt(void)
{
writel(TIMER_IRQ_EN(0), timer_base + TIMER_IRQ_ST_REG);
}
static irqreturn_t sun4i_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *evt = (struct clock_event_device *)dev_id;
writel(0x1, timer_base + TIMER_IRQ_ST_REG);
sun4i_timer_clear_interrupt();
evt->event_handler(evt);
return IRQ_HANDLED;
......@@ -208,6 +212,9 @@ static int __init sun4i_timer_init(struct device_node *node)
/* Make sure timer is stopped before playing with interrupts */
sun4i_clkevt_time_stop(0);
/* clear timer0 interrupt */
sun4i_timer_clear_interrupt();
sun4i_clockevent.cpumask = cpu_possible_mask;
sun4i_clockevent.irq = irq;
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment