[patch V2 44/45] genirq/manage: Rework irq_set_irqchip_state()

[Thomas Gleixner <tglx@linutronix.de>]

Use the new guards to get and lock the interrupt descriptor and tidy up the
code.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
 kernel/irq/manage.c |   53 +++++++++++++++++++---------------------------------
 1 file changed, 20 insertions(+), 33 deletions(-)

--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -2703,39 +2703,26 @@ EXPORT_SYMBOL_GPL(irq_get_irqchip_state)
  */
 int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which, bool val)
 {
-	struct irq_desc *desc;
-	struct irq_data *data;
-	struct irq_chip *chip;
-	unsigned long flags;
-	int err = -EINVAL;
-
-	desc = irq_get_desc_buslock(irq, &flags, 0);
-	if (!desc)
-		return err;
-
-	data = irq_desc_get_irq_data(desc);
-
-	do {
-		chip = irq_data_get_irq_chip(data);
-		if (WARN_ON_ONCE(!chip)) {
-			err = -ENODEV;
-			goto out_unlock;
-		}
-		if (chip->irq_set_irqchip_state)
-			break;
-#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
-		data = data->parent_data;
-#else
-		data = NULL;
-#endif
-	} while (data);
-
-	if (data)
-		err = chip->irq_set_irqchip_state(data, which, val);
-
-out_unlock:
-	irq_put_desc_busunlock(desc, flags);
-	return err;
+	scoped_irqdesc_get_and_buslock(irq, 0) {
+		struct irq_data *data = irq_desc_get_irq_data(scoped_irqdesc);
+		struct irq_chip *chip;
+
+		do {
+			chip = irq_data_get_irq_chip(data);
+
+			if (WARN_ON_ONCE(!chip))
+				return -ENODEV;
+
+			if (chip->irq_set_irqchip_state)
+				break;
+
+			data = irqd_get_parent_data(data);
+		} while (data);
+
+		if (data)
+			return chip->irq_set_irqchip_state(data, which, val);
+	}
+	return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(irq_set_irqchip_state);