linux-kernel - [PATCH v4 2/2] clocksource/drivers/timer-riscv: Stop stimecmp when cpu hotplug

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Message-Id: <20250219114135.27764-3-nick.hu@sifive.com>
Date: Wed, 19 Feb 2025 19:41:35 +0800
From: Nick Hu <nick.hu@...ive.com>
To: Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>
Cc: Nick Hu <nick.hu@...ive.com>,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: [PATCH v4 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..4d7cf338824a 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -126,7 +126,13 @@ static int riscv_timer_starting_cpu(unsigned int cpu)
 
 static int riscv_timer_dying_cpu(unsigned int cpu)
 {
+	/*
+	 * 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();
 	disable_percpu_irq(riscv_clock_event_irq);
+
 	return 0;
 }
 
-- 
2.17.1