[PATCH v6 11/18] arm: tegra20: cpuidle: Make abort_flag atomic

[Dmitry Osipenko]

Replace memory accessors with atomic API just to make code consistent
with the abort_barrier. The new variant may be even more correct now since
atomic_read() will prevent compiler from generating wrong things like
carrying abort_flag value in a register instead of re-fetching it from
memory.

Signed-off-by: Dmitry Osipenko <dig...@gmail.com>
---
 arch/arm/mach-tegra/cpuidle-tegra20.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-tegra/cpuidle-tegra20.c 
b/arch/arm/mach-tegra/cpuidle-tegra20.c
index bc5873e92af5..fe80f1988120 100644
--- a/arch/arm/mach-tegra/cpuidle-tegra20.c
+++ b/arch/arm/mach-tegra/cpuidle-tegra20.c
@@ -32,7 +32,7 @@
 #include "sleep.h"
 
 #ifdef CONFIG_PM_SLEEP
-static bool abort_flag;
+static atomic_t abort_flag;
 static atomic_t abort_barrier;
 static int tegra20_idle_lp2_coupled(struct cpuidle_device *dev,
                                    struct cpuidle_driver *drv,
@@ -167,13 +167,14 @@ static int tegra20_idle_lp2_coupled(struct cpuidle_device 
*dev,
        bool entered_lp2 = false;
 
        if (tegra_pending_sgi())
-               WRITE_ONCE(abort_flag, true);
+               atomic_set(&abort_flag, 1);
 
        cpuidle_coupled_parallel_barrier(dev, &abort_barrier);
 
-       if (abort_flag) {
+       if (atomic_read(&abort_flag)) {
                cpuidle_coupled_parallel_barrier(dev, &abort_barrier);
-               abort_flag = false;     /* clean flag for next coming */
+               /* clean flag for next coming */
+               atomic_set(&abort_flag, 0);
                return -EINTR;
        }
 
-- 
2.23.0