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authorPawel Moll <pawel.moll@arm.com>2014-01-22 17:32:02 +0100
committerBryan Wu <cooloney@gmail.com>2014-02-27 18:56:54 +0100
commitfba14ae8e924881038406ecff031d2d17becc2cb (patch)
tree86a5548effb8fab412e9940d92cfccb7e2a14927 /drivers
parentLinux 3.14-rc4 (diff)
downloadlinux-fba14ae8e924881038406ecff031d2d17becc2cb.tar.xz
linux-fba14ae8e924881038406ecff031d2d17becc2cb.zip
ledtrig-cpu: Handle CPU hot(un)plugging
When CPU is hot(un)plugged, no syscore notification is being generated, nor is cpuidle involved. This leaves the CPU LED turned on, because the dying thread is doing some work (LED on) and than it is... well, dying (LED still on :-) Added notifier block for hot(un)plugging operations, generating existing trigger events. Signed-off-by: Pawel Moll <pawel.moll@arm.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/leds/trigger/ledtrig-cpu.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/leds/trigger/ledtrig-cpu.c b/drivers/leds/trigger/ledtrig-cpu.c
index 118335eccc56..1c3ee9fcaf34 100644
--- a/drivers/leds/trigger/ledtrig-cpu.c
+++ b/drivers/leds/trigger/ledtrig-cpu.c
@@ -26,6 +26,7 @@
#include <linux/percpu.h>
#include <linux/syscore_ops.h>
#include <linux/rwsem.h>
+#include <linux/cpu.h>
#include "../leds.h"
#define MAX_NAME_LEN 8
@@ -92,6 +93,26 @@ static struct syscore_ops ledtrig_cpu_syscore_ops = {
.resume = ledtrig_cpu_syscore_resume,
};
+static int ledtrig_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
+{
+ switch (action & ~CPU_TASKS_FROZEN) {
+ case CPU_STARTING:
+ ledtrig_cpu(CPU_LED_START);
+ break;
+ case CPU_DYING:
+ ledtrig_cpu(CPU_LED_STOP);
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+
+static struct notifier_block ledtrig_cpu_nb = {
+ .notifier_call = ledtrig_cpu_notify,
+};
+
static int __init ledtrig_cpu_init(void)
{
int cpu;
@@ -113,6 +134,7 @@ static int __init ledtrig_cpu_init(void)
}
register_syscore_ops(&ledtrig_cpu_syscore_ops);
+ register_cpu_notifier(&ledtrig_cpu_nb);
pr_info("ledtrig-cpu: registered to indicate activity on CPUs\n");
@@ -124,6 +146,8 @@ static void __exit ledtrig_cpu_exit(void)
{
int cpu;
+ unregister_cpu_notifier(&ledtrig_cpu_nb);
+
for_each_possible_cpu(cpu) {
struct led_trigger_cpu *trig = &per_cpu(cpu_trig, cpu);