[RFC,11/27] drivers: cpu: Define CPU devices as IRQ safe

Commit Message

Lina Iyer Nov. 17, 2015, 10:37 p.m. UTC

CPUs may be powered off from CPUIdle or hotplug and are called with
IRQ's disabled. Define CPU devices as IRQ safe, so they may be runtime
suspended/resumed.

Reviewed-by: Stephen Boyd <[e-mail]>
Signed-off-by: Lina Iyer <[e-mail]>
---
 drivers/base/cpu.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 91bbb19..6633210 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -17,6 +17,7 @@ 
 #include <linux/of.h>
 #include <linux/cpufeature.h>
 #include <linux/tick.h>
+#include <linux/pm_runtime.h>
 
 #include "base.h"
 
@@ -371,10 +372,11 @@  int register_cpu(struct cpu *cpu, int num)
 	if (cpu->hotpluggable)
 		cpu->dev.groups = hotplugable_cpu_attr_groups;
 	error = device_register(&cpu->dev);
-	if (!error)
+	if (!error) {
+		pm_runtime_irq_safe(&cpu->dev);
 		per_cpu(cpu_sys_devices, num) = &cpu->dev;
-	if (!error)
 		register_cpu_under_node(num, cpu_to_node(num));
+	}
 
 	return error;
 }