genirq: Add chip flag for restricting cpu_on/offline calls

Add a flag which indicates that the on/offline callback should only be
called on enabled interrupts.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

include/linux/irq.h

@@ -348,11 +348,14 @@ struct irq_chip {
  * IRQCHIP_SET_TYPE_MASKED:	Mask before calling chip.irq_set_type()
  * IRQCHIP_EOI_IF_HANDLED:	Only issue irq_eoi() when irq was handled
  * IRQCHIP_MASK_ON_SUSPEND:	Mask non wake irqs in the suspend path
+ * IRQCHIP_ONOFFLINE_ENABLED:	Only call irq_on/off_line callbacks
+ *				when irq enabled
  */
 enum {
 	IRQCHIP_SET_TYPE_MASKED		= (1 <<  0),
 	IRQCHIP_EOI_IF_HANDLED		= (1 <<  1),
 	IRQCHIP_MASK_ON_SUSPEND		= (1 <<  2),
+	IRQCHIP_ONOFFLINE_ENABLED	= (1 <<  3),
 };
 
 /* This include will go away once we isolated irq_desc usage to core code */

kernel/irq/chip.c

@@ -718,8 +718,9 @@ void irq_cpu_online(void)
 		raw_spin_lock_irqsave(&desc->lock, flags);
 
 		chip = irq_data_get_irq_chip(&desc->irq_data);
-
-		if (chip && chip->irq_cpu_online)
+		if (chip && chip->irq_cpu_online &&
+		    (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
+		     !(desc->istate & IRQS_DISABLED)))
 			chip->irq_cpu_online(&desc->irq_data);
 
 		raw_spin_unlock_irqrestore(&desc->lock, flags);
@@ -747,8 +748,9 @@ void irq_cpu_offline(void)
 		raw_spin_lock_irqsave(&desc->lock, flags);
 
 		chip = irq_data_get_irq_chip(&desc->irq_data);
-
-		if (chip && chip->irq_cpu_offline)
+		if (chip && chip->irq_cpu_offline &&
+		    (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
+		     !(desc->istate & IRQS_DISABLED)))
 			chip->irq_cpu_offline(&desc->irq_data);
 
 		raw_spin_unlock_irqrestore(&desc->lock, flags);