[patch 11/46] genirq/chip: Prepare for code reduction

[Thomas Gleixner]

The interrupt flow handlers have similar patterns to decide whether to
handle an interrupt or not.

Provide common helper functions to allow removal of duplicated code.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 kernel/irq/chip.c |   37 ++++++++++++++++++++++++++++---------
 1 file changed, 28 insertions(+), 9 deletions(-)

--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -499,7 +499,7 @@ static bool irq_check_poll(struct irq_de
 	return irq_wait_for_poll(desc);
 }
 
-static bool irq_may_run(struct irq_desc *desc)
+static bool irq_can_handle_pm(struct irq_desc *desc)
 {
 	unsigned int mask = IRQD_IRQ_INPROGRESS | IRQD_WAKEUP_ARMED;
 
@@ -524,6 +524,25 @@ static bool irq_may_run(struct irq_desc
 	return irq_check_poll(desc);
 }
 
+static inline bool irq_can_handle_actions(struct irq_desc *desc)
+{
+	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
+
+	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
+		desc->istate |= IRQS_PENDING;
+		return false;
+	}
+	return true;
+}
+
+static inline bool irq_can_handle(struct irq_desc *desc)
+{
+	if (!irq_can_handle_pm(desc))
+		return false;
+
+	return irq_can_handle_actions(desc);
+}
+
 /**
  *	handle_simple_irq - Simple and software-decoded IRQs.
  *	@desc:	the interrupt description structure for this irq
@@ -539,7 +558,7 @@ void handle_simple_irq(struct irq_desc *
 {
 	raw_spin_lock(&desc->lock);
 
-	if (!irq_may_run(desc))
+	if (!irq_can_handle_pm(desc))
 		goto out_unlock;
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
@@ -574,7 +593,7 @@ void handle_untracked_irq(struct irq_des
 {
 	raw_spin_lock(&desc->lock);
 
-	if (!irq_may_run(desc))
+	if (!irq_can_handle_pm(desc))
 		goto out_unlock;
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
@@ -630,7 +649,7 @@ void handle_level_irq(struct irq_desc *d
 	raw_spin_lock(&desc->lock);
 	mask_ack_irq(desc);
 
-	if (!irq_may_run(desc))
+	if (!irq_can_handle_pm(desc))
 		goto out_unlock;
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
@@ -695,7 +714,7 @@ void handle_fasteoi_irq(struct irq_desc
 	 * can arrive on the new CPU before the original CPU has completed
 	 * handling the previous one - it may need to be resent.
 	 */
-	if (!irq_may_run(desc)) {
+	if (!irq_can_handle_pm(desc)) {
 		if (irqd_needs_resend_when_in_progress(&desc->irq_data))
 			desc->istate |= IRQS_PENDING;
 		goto out;
@@ -790,7 +809,7 @@ void handle_edge_irq(struct irq_desc *de
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 
-	if (!irq_may_run(desc)) {
+	if (!irq_can_handle_pm(desc)) {
 		desc->istate |= IRQS_PENDING;
 		mask_ack_irq(desc);
 		goto out_unlock;
@@ -854,7 +873,7 @@ void handle_edge_eoi_irq(struct irq_desc
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 
-	if (!irq_may_run(desc)) {
+	if (!irq_can_handle_pm(desc)) {
 		desc->istate |= IRQS_PENDING;
 		goto out_eoi;
 	}
@@ -1213,7 +1232,7 @@ void handle_fasteoi_ack_irq(struct irq_d
 
 	raw_spin_lock(&desc->lock);
 
-	if (!irq_may_run(desc))
+	if (!irq_can_handle_pm(desc))
 		goto out;
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
@@ -1265,7 +1284,7 @@ void handle_fasteoi_mask_irq(struct irq_
 	raw_spin_lock(&desc->lock);
 	mask_ack_irq(desc);
 
-	if (!irq_may_run(desc))
+	if (!irq_can_handle_pm(desc))
 		goto out;
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);