genirq/chip: Rework handle_simple_irq()

Use the new helpers to decide whether the interrupt should be handled and
switch the descriptor locking to guard().

Fixup the kernel doc comment while at it.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20250429065420.804683349@linutronix.de

Author: KAGA-KOKO

kernel/irq/chip.c

@@ -538,35 +538,25 @@ void handle_nested_irq(unsigned int irq)
 EXPORT_SYMBOL_GPL(handle_nested_irq);
 
 /**
- *	handle_simple_irq - Simple and software-decoded IRQs.
- *	@desc:	the interrupt description structure for this irq
+ * handle_simple_irq - Simple and software-decoded IRQs.
+ * @desc:	the interrupt description structure for this irq
  *
- *	Simple interrupts are either sent from a demultiplexing interrupt
- *	handler or come from hardware, where no interrupt hardware control
- *	is necessary.
+ * Simple interrupts are either sent from a demultiplexing interrupt
+ * handler or come from hardware, where no interrupt hardware control is
+ * necessary.
  *
- *	Note: The caller is expected to handle the ack, clear, mask and
- *	unmask issues if necessary.
+ * Note: The caller is expected to handle the ack, clear, mask and unmask
+ * issues if necessary.
  */
 void handle_simple_irq(struct irq_desc *desc)
 {
-	raw_spin_lock(&desc->lock);
-
-	if (!irq_can_handle_pm(desc))
-		goto out_unlock;
-
-	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
+	guard(raw_spinlock)(&desc->lock);
 
-	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
-		desc->istate |= IRQS_PENDING;
-		goto out_unlock;
-	}
+	if (!irq_can_handle(desc))
+		return;
 
 	kstat_incr_irqs_this_cpu(desc);
 	handle_irq_event(desc);
-
-out_unlock:
-	raw_spin_unlock(&desc->lock);
 }
 EXPORT_SYMBOL_GPL(handle_simple_irq);