linux-kernel - [PATCH RT 08/19] arm: imx6: cpuidle: Use raw_spinlock

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Date:   Thu,  8 Aug 2019 14:52:36 -0500
From:   zanussi@...nel.org
To:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Daniel Wagner <wagi@...om.org>,
        Tom Zanussi <zanussi@...nel.org>,
        Julia Cartwright <julia@...com>
Subject: [PATCH RT 08/19] arm: imx6: cpuidle: Use raw_spinlock_t

From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

v4.14.137-rt65-rc1 stable review patch.
If anyone has any objections, please let me know.

-----------


[ Upstream commit 40d0332ec8312e9c090f0a5414d9c90e12b13611 ]

The idle call back is invoked with disabled interrupts and requires
raw_spinlock_t locks to work.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Tom Zanussi <zanussi@...nel.org>
---
 arch/arm/mach-imx/cpuidle-imx6q.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mach-imx/cpuidle-imx6q.c b/arch/arm/mach-imx/cpuidle-imx6q.c
index 326e870d7123..d9ac80aa1eb0 100644
--- a/arch/arm/mach-imx/cpuidle-imx6q.c
+++ b/arch/arm/mach-imx/cpuidle-imx6q.c
@@ -17,22 +17,22 @@
 #include "hardware.h"
 
 static int num_idle_cpus = 0;
-static DEFINE_SPINLOCK(cpuidle_lock);
+static DEFINE_RAW_SPINLOCK(cpuidle_lock);
 
 static int imx6q_enter_wait(struct cpuidle_device *dev,
 			    struct cpuidle_driver *drv, int index)
 {
-	spin_lock(&cpuidle_lock);
+	raw_spin_lock(&cpuidle_lock);
 	if (++num_idle_cpus == num_online_cpus())
 		imx6_set_lpm(WAIT_UNCLOCKED);
-	spin_unlock(&cpuidle_lock);
+	raw_spin_unlock(&cpuidle_lock);
 
 	cpu_do_idle();
 
-	spin_lock(&cpuidle_lock);
+	raw_spin_lock(&cpuidle_lock);
 	if (num_idle_cpus-- == num_online_cpus())
 		imx6_set_lpm(WAIT_CLOCKED);
-	spin_unlock(&cpuidle_lock);
+	raw_spin_unlock(&cpuidle_lock);
 
 	return index;
 }
-- 
2.14.1