genirq/manage: Rework enable_irq()

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

No functional change.

Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lore.kernel.org/all/[email protected]

Author: KAGA-KOKO

kernel/irq/manage.c

@@ -789,18 +789,13 @@ void __enable_irq(struct irq_desc *desc)
  */
 void enable_irq(unsigned int irq)
 {
-	unsigned long flags;
-	struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
-
-	if (!desc)
-		return;
-	if (WARN(!desc->irq_data.chip,
-		 KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq))
-		goto out;
+	scoped_irqdesc_get_and_lock(irq, IRQ_GET_DESC_CHECK_GLOBAL) {
+		struct irq_desc *desc = scoped_irqdesc;
 
-	__enable_irq(desc);
-out:
-	irq_put_desc_busunlock(desc, flags);
+		if (WARN(!desc->irq_data.chip, "enable_irq before setup/request_irq: irq %u\n", irq))
+			return;
+		__enable_irq(desc);
+	}
 }
 EXPORT_SYMBOL(enable_irq);