Subject: [PATCH 4/4] cpuidle/powernv: avoid double irq enable coming out of idle

From: Nicholas Piggin <[email-masked]>
Date: Fri, 17 Nov 2017 02:00:52 +1000

Since e1689795a7 ("cpuidle: Add common time keeping and irq enabling"),
cpuidle drivers are expected to return from ->enter with irqs disabled.

Update the cpuidle-powernv snooze and cede loops to disable irqs before
returning.

Signed-off-by: Nicholas Piggin <[email-masked]>
---
 drivers/cpuidle/cpuidle-pseries.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-pseries.c b/drivers/cpuidle/cpuidle-pseries.c
index a187a39fb866..0f2b697cbb27 100644
--- a/drivers/cpuidle/cpuidle-pseries.c
+++ b/drivers/cpuidle/cpuidle-pseries.c
@@ -51,8 +51,6 @@ static inline void idle_loop_epilog(unsigned long in_purr)
 	get_lppaca()->wait_state_cycles = cpu_to_be64(wait_cycles);
 	get_lppaca()->idle = 0;
 
-	if (irqs_disabled())
-		local_irq_enable();
 	ppc64_runlatch_on();
 }
 
@@ -87,6 +85,8 @@ static int snooze_loop(struct cpuidle_device *dev,
 	HMT_medium();
 	clear_thread_flag(TIF_POLLING_NRFLAG);
 
+	local_irq_disable();
+
 	idle_loop_epilog(in_purr);
 
 	return index;
@@ -121,6 +121,7 @@ static int dedicated_cede_loop(struct cpuidle_device *dev,
 	HMT_medium();
 	check_and_cede_processor();
 
+	local_irq_disable();
 	get_lppaca()->donate_dedicated_cpu = 0;
 
 	idle_loop_epilog(in_purr);
@@ -145,6 +146,7 @@ static int shared_cede_loop(struct cpuidle_device *dev,
 	 */
 	check_and_cede_processor();
 
+	local_irq_disable();
 	idle_loop_epilog(in_purr);
 
 	return index;
-- 
2.15.0