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 <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]/T/#u
Signed-off-by: Nick Hu <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Acked-by: Daniel Lezcano <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexandre Ghiti <[email protected]>

Author: nick650823

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;
 }