From: Chen-Yu Tsai wens@csie.org
[ Upstream commit e7e7e0d7beafebd11b0c065cd5fbc1e5759c5aab ]
If the clock tree is not fully populated when the timer-sun5i init code is called, attempts to get the clock rate for the timer would fail and return 0.
Make the init code for both clock events and clocksource check the returned clock rate and fail gracefully if the result is 0, instead of causing a divide by 0 exception later on.
Fixes: 4a59058f0b09 ("clocksource/drivers/sun5i: Refactor the current code") Signed-off-by: Chen-Yu Tsai wens@csie.org Acked-by: Maxime Ripard maxime.ripard@bootlin.com Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/clocksource/timer-sun5i.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/clocksource/timer-sun5i.c b/drivers/clocksource/timer-sun5i.c index 3b56ea3..552c525 100644 --- a/drivers/clocksource/timer-sun5i.c +++ b/drivers/clocksource/timer-sun5i.c @@ -202,6 +202,11 @@ static int __init sun5i_setup_clocksource(struct device_node *node, }
rate = clk_get_rate(clk); + if (!rate) { + pr_err("Couldn't get parent clock rate\n"); + ret = -EINVAL; + goto err_disable_clk; + }
cs->timer.base = base; cs->timer.clk = clk; @@ -275,6 +280,11 @@ static int __init sun5i_setup_clockevent(struct device_node *node, void __iomem }
rate = clk_get_rate(clk); + if (!rate) { + pr_err("Couldn't get parent clock rate\n"); + ret = -EINVAL; + goto err_disable_clk; + }
ce->timer.base = base; ce->timer.ticks_per_jiffy = DIV_ROUND_UP(rate, HZ);