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leds/trigger/cpu: Convert to hotplug state machine

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This is a straightforward conversion. We place this callback last
in the list so that the LED illuminates only after a successful
bring up sequence.

( NOTE: The patch adds a FIXME question about the callback used,
        this question should probably be revisited later on.)

Signed-off-by: Richard Cochran <[email protected]>
Signed-off-by: Anna-Maria Gleixner <[email protected]>
Reviewed-by: Sebastian Andrzej Siewior <[email protected]>
Acked-by: Jacek Anaszewski <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Richard Purdie <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Richard Cochran 2016-07-13 17:16:45 +00:00 • committed by Ingo Molnar
commit 911a359de9
2 changed files with 16 additions and 17 deletions
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32
drivers/leds/trigger/ledtrig-cpu.c
View file

@ -92,25 +92,17 @@ 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)
static int ledtrig_starting_cpu(unsigned int cpu)
{
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;
ledtrig_cpu(CPU_LED_START);
return 0;
}
static struct notifier_block ledtrig_cpu_nb = {
.notifier_call = ledtrig_cpu_notify,
};
static int ledtrig_dying_cpu(unsigned int cpu)
{
ledtrig_cpu(CPU_LED_STOP);
return 0;
}
static int __init ledtrig_cpu_init(void)
{
@ -133,7 +125,13 @@ static int __init ledtrig_cpu_init(void)
}
register_syscore_ops(&ledtrig_cpu_syscore_ops);
register_cpu_notifier(&ledtrig_cpu_nb);
/*
* FIXME: Why needs this to happen in the interrupt disabled
* low level bringup phase of a cpu?
*/
cpuhp_setup_state(CPUHP_AP_LEDTRIG_STARTING, "AP_LEDTRIG_STARTING",
ledtrig_starting_cpu, ledtrig_dying_cpu);
pr_info("ledtrig-cpu: registered to indicate activity on CPUs\n");