linux-kernel - [PATCH AUTOSEL 5.10 021/114] clocksource/drivers/timer-riscv: Stop stimecmp when cpu hotplug

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Message-Id: <20250505231817.2697367-21-sashal@kernel.org>
Date: Mon,  5 May 2025 19:16:44 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Nick Hu <nick.hu@...ive.com>,
	Anup Patel <anup@...infault.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Sasha Levin <sashal@...nel.org>,
	tglx@...utronix.de,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	linux-riscv@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.10 021/114] clocksource/drivers/timer-riscv: Stop stimecmp when cpu hotplug

From: Nick Hu <nick.hu@...ive.com>

[ Upstream commit 70c93b026ed07078e933583591aa9ca6701cd9da ]

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>
Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Link: https://lore.kernel.org/r/20250219114135.27764-3-nick.hu@sifive.com
Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
Signed-off-by: Sasha Levin <sashal@...nel.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 c51c5ed15aa75..427c92dd048c4 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -75,7 +75,13 @@ 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;
 }
 
-- 
2.39.5