genirq: Add irq disabled flag to irq_data state

Some irq_chip implementation require to know the disabled state of the
interrupt in certain callbacks. Add a state flag and accessor to
irq_data.

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

include/linux/irq.h

@@ -174,6 +174,8 @@ struct irq_data {
  *				  from suspend
  * IRDQ_MOVE_PCNTXT		- Interrupt can be moved in process
  *				  context
+ * IRQD_IRQ_DISABLED		- Some chip function need to know the
+ *				  disabled state.
  */
 enum {
 	IRQD_TRIGGER_MASK		= 0xf,
@@ -184,6 +186,7 @@ enum {
 	IRQD_LEVEL			= (1 << 13),
 	IRQD_WAKEUP_STATE		= (1 << 14),
 	IRQD_MOVE_PCNTXT		= (1 << 15),
+	IRQD_IRQ_DISABLED		= (1 << 16),
 };
 
 static inline bool irqd_is_setaffinity_pending(struct irq_data *d)
@@ -235,6 +238,11 @@ static inline bool irqd_can_move_in_process_context(struct irq_data *d)
 	return d->state_use_accessors & IRQD_MOVE_PCNTXT;
 }
 
+static inline bool irqd_irq_disabled(struct irq_data *d)
+{
+	return d->state_use_accessors & IRQD_IRQ_DISABLED;
+}
+
 /**
  * struct irq_chip - hardware interrupt chip descriptor
  *

kernel/irq/chip.c

@@ -141,12 +141,14 @@ EXPORT_SYMBOL_GPL(irq_get_irq_data);
 static void irq_state_clr_disabled(struct irq_desc *desc)
 {
 	desc->istate &= ~IRQS_DISABLED;
+	irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
 	irq_compat_clr_disabled(desc);
 }
 
 static void irq_state_set_disabled(struct irq_desc *desc)
 {
 	desc->istate |= IRQS_DISABLED;
+	irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
 	irq_compat_set_disabled(desc);
 }
 
@@ -648,8 +650,7 @@ __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 	if (handle == handle_bad_irq) {
 		if (desc->irq_data.chip != &no_irq_chip)
 			mask_ack_irq(desc);
-		irq_compat_set_disabled(desc);
-		desc->istate |= IRQS_DISABLED;
+		irq_state_set_disabled(desc);
 		desc->depth = 1;
 	}
 	desc->handle_irq = handle;

kernel/irq/irqdesc.c

@@ -80,6 +80,7 @@ static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node)
 	desc->irq_data.handler_data = NULL;
 	desc->irq_data.msi_desc = NULL;
 	irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
+	irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
 	desc->istate = IRQS_DISABLED;
 	desc->handle_irq = handle_bad_irq;
 	desc->depth = 1;