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Message-Id: <20241028033928.223218-3-nick.hu@sifive.com>
Date: Mon, 28 Oct 2024 11:39:26 +0800
From: Nick Hu <nick.hu@...ive.com>
To: greentime.hu@...ive.com,
zong.li@...ive.com,
"Rafael J. Wysocki" <rafael@...nel.org>,
Pavel Machek <pavel@....cz>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
Andrew Jones <ajones@...tanamicro.com>,
Conor Dooley <conor.dooley@...rochip.com>,
Samuel Holland <samuel.holland@...ive.com>,
Nick Hu <nick.hu@...ive.com>,
Sunil V L <sunilvl@...tanamicro.com>,
linux-pm@...r.kernel.org,
linux-riscv@...ts.infradead.org,
linux-kernel@...r.kernel.org
Cc: Anup Patel <anup@...infault.org>
Subject: [PATCH v3 2/2] clocksource/drivers/timer-riscv: Stop stimecmp when cpu hotplug
Stop the timer when the cpu is going to be offline otherwise the
timer interrupt may be pending while performing power-down.
Suggested-by: Anup Patel <anup@...infault.org>
Link: https://lore.kernel.org/lkml/20240829033904.477200-3-nick.hu@sifive.com/T/#u
Signed-off-by: Nick Hu <nick.hu@...ive.com>
Reviewed-by: Anup Patel <anup@...infault.org>
---
drivers/clocksource/timer-riscv.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
index 48ce50c5f5e6..166dee14e46b 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -127,6 +127,12 @@ static int riscv_timer_starting_cpu(unsigned int cpu)
static int riscv_timer_dying_cpu(unsigned int cpu)
{
disable_percpu_irq(riscv_clock_event_irq);
+ /*
+ * Stop the timer when the cpu is going to be offline otherwise
+ * the timer interrupt may be pending while performing power-down.
+ */
+ riscv_clock_event_stop();
+
return 0;
}
--
2.34.1
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