* [PATCH] clocksource: sun5i: fail gracefully when clock rate is unavailable
@ 2019-01-10 6:22 Chen-Yu Tsai
2019-01-10 6:59 ` Maxime Ripard
2019-01-10 9:19 ` Daniel Lezcano
0 siblings, 2 replies; 5+ messages in thread
From: Chen-Yu Tsai @ 2019-01-10 6:22 UTC (permalink / raw)
To: Daniel Lezcano, Thomas Gleixner, Maxime Ripard
Cc: Chen-Yu Tsai, linux-kernel, linux-arm-kernel
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>
---
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 3b56ea3f52af..552c5254390c 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);
--
2.20.1
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^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] clocksource: sun5i: fail gracefully when clock rate is unavailable
2019-01-10 6:22 [PATCH] clocksource: sun5i: fail gracefully when clock rate is unavailable Chen-Yu Tsai
@ 2019-01-10 6:59 ` Maxime Ripard
2019-01-10 9:19 ` Daniel Lezcano
1 sibling, 0 replies; 5+ messages in thread
From: Maxime Ripard @ 2019-01-10 6:59 UTC (permalink / raw)
To: Chen-Yu Tsai
Cc: Thomas Gleixner, Daniel Lezcano, linux-kernel, linux-arm-kernel
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On Thu, Jan 10, 2019 at 02:22:07PM +0800, Chen-Yu Tsai wrote:
> 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>
Thanks!
Maxime
--
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Embedded Linux and Kernel engineering
https://bootlin.com
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^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] clocksource: sun5i: fail gracefully when clock rate is unavailable
2019-01-10 6:22 [PATCH] clocksource: sun5i: fail gracefully when clock rate is unavailable Chen-Yu Tsai
2019-01-10 6:59 ` Maxime Ripard
@ 2019-01-10 9:19 ` Daniel Lezcano
2019-01-24 8:56 ` Chen-Yu Tsai
1 sibling, 1 reply; 5+ messages in thread
From: Daniel Lezcano @ 2019-01-10 9:19 UTC (permalink / raw)
To: Chen-Yu Tsai, Thomas Gleixner, Maxime Ripard
Cc: linux-kernel, linux-arm-kernel
On 10/01/2019 07:22, Chen-Yu Tsai wrote:
> 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>
> ---
Applied thanks.
--
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^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] clocksource: sun5i: fail gracefully when clock rate is unavailable
2019-01-10 9:19 ` Daniel Lezcano
@ 2019-01-24 8:56 ` Chen-Yu Tsai
2019-01-24 9:38 ` Daniel Lezcano
0 siblings, 1 reply; 5+ messages in thread
From: Chen-Yu Tsai @ 2019-01-24 8:56 UTC (permalink / raw)
To: Daniel Lezcano
Cc: Maxime Ripard, Thomas Gleixner, linux-kernel, linux-arm-kernel
On Thu, Jan 10, 2019 at 5:19 PM Daniel Lezcano
<daniel.lezcano@linaro.org> wrote:
>
> On 10/01/2019 07:22, Chen-Yu Tsai wrote:
> > 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>
> > ---
>
> Applied thanks.
I'm not seeing this in linux-next, nor the patch
arm64: arch_timer: Workaround for Allwinner A64 timer instability
Any idea where these ended up?
Thanks
ChenYu
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^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] clocksource: sun5i: fail gracefully when clock rate is unavailable
2019-01-24 8:56 ` Chen-Yu Tsai
@ 2019-01-24 9:38 ` Daniel Lezcano
0 siblings, 0 replies; 5+ messages in thread
From: Daniel Lezcano @ 2019-01-24 9:38 UTC (permalink / raw)
To: Chen-Yu Tsai
Cc: Maxime Ripard, Thomas Gleixner, linux-kernel, linux-arm-kernel
On 24/01/2019 09:56, Chen-Yu Tsai wrote:
> On Thu, Jan 10, 2019 at 5:19 PM Daniel Lezcano
> <daniel.lezcano@linaro.org> wrote:
>>
>> On 10/01/2019 07:22, Chen-Yu Tsai wrote:
>>> 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>
>>> ---
>>
>> Applied thanks.
>
> I'm not seeing this in linux-next, nor the patch
>
> arm64: arch_timer: Workaround for Allwinner A64 timer instability
>
> Any idea where these ended up?
Yeah, I have a rough idea. They are now in linux-next via the
clockevents/next branch.
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^ permalink raw reply [flat|nested] 5+ messages in thread
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2019-01-10 6:22 [PATCH] clocksource: sun5i: fail gracefully when clock rate is unavailable Chen-Yu Tsai
2019-01-10 6:59 ` Maxime Ripard
2019-01-10 9:19 ` Daniel Lezcano
2019-01-24 8:56 ` Chen-Yu Tsai
2019-01-24 9:38 ` Daniel Lezcano
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