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Diffstat (limited to 'kernel/irq/pm.c')
-rw-r--r--kernel/irq/pm.c55
1 files changed, 29 insertions, 26 deletions
diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
index 766930eaeed9..3ca532592704 100644
--- a/kernel/irq/pm.c
+++ b/kernel/irq/pm.c
@@ -9,10 +9,24 @@
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/interrupt.h>
+#include <linux/suspend.h>
#include <linux/syscore_ops.h>
#include "internals.h"
+bool irq_pm_check_wakeup(struct irq_desc *desc)
+{
+ if (irqd_is_wakeup_armed(&desc->irq_data)) {
+ irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED);
+ desc->istate |= IRQS_SUSPENDED | IRQS_PENDING;
+ desc->depth++;
+ irq_disable(desc);
+ pm_system_wakeup();
+ return true;
+ }
+ return false;
+}
+
/*
* Called from __setup_irq() with desc->lock held after @action has
* been installed in the action chain.
@@ -54,8 +68,16 @@ static bool suspend_device_irq(struct irq_desc *desc, int irq)
if (!desc->action || desc->no_suspend_depth)
return false;
- if (irqd_is_wakeup_set(&desc->irq_data))
+ if (irqd_is_wakeup_set(&desc->irq_data)) {
irqd_set(&desc->irq_data, IRQD_WAKEUP_ARMED);
+ /*
+ * We return true here to force the caller to issue
+ * synchronize_irq(). We need to make sure that the
+ * IRQD_WAKEUP_ARMED is visible before we return from
+ * suspend_device_irqs().
+ */
+ return true;
+ }
desc->istate |= IRQS_SUSPENDED;
__disable_irq(desc, irq);
@@ -79,9 +101,13 @@ static bool suspend_device_irq(struct irq_desc *desc, int irq)
* for this purpose.
*
* So we disable all interrupts and mark them IRQS_SUSPENDED except
- * for those which are unused and those which are marked as not
+ * for those which are unused, those which are marked as not
* suspendable via an interrupt request with the flag IRQF_NO_SUSPEND
- * set.
+ * set and those which are marked as active wakeup sources.
+ *
+ * The active wakeup sources are handled by the flow handler entry
+ * code which checks for the IRQD_WAKEUP_ARMED flag, suspends the
+ * interrupt and notifies the pm core about the wakeup.
*/
void suspend_device_irqs(void)
{
@@ -173,26 +199,3 @@ void resume_device_irqs(void)
resume_irqs(false);
}
EXPORT_SYMBOL_GPL(resume_device_irqs);
-
-/**
- * check_wakeup_irqs - check if any wake-up interrupts are pending
- */
-int check_wakeup_irqs(void)
-{
- struct irq_desc *desc;
- int irq;
-
- for_each_irq_desc(irq, desc) {
- /*
- * Only interrupts which are marked as wakeup source
- * and have not been disabled before the suspend check
- * can abort suspend.
- */
- if (irqd_is_wakeup_set(&desc->irq_data)) {
- if (desc->depth == 1 && desc->istate & IRQS_PENDING)
- return -EBUSY;
- }
- }
-
- return 0;
-}