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Commit e8bd834f authored by Grant Likely's avatar Grant Likely Committed by Thomas Gleixner
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genirq: irqchip: Add mask to block out invalid irqs 



Some controllers have irqs that aren't wired up and must never be used.
For the generic chip attached to an irq_domain this provides a mask that
can be used to block out particular irqs so that they never get mapped.

Signed-off-by: default avatarGrant Likely <grant.likely@linaro.org>
Link: http://lkml.kernel.org/r/1369793454-19197-2-git-send-email-grant.likely@linaro.org


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 088f40b7

include/linux/irq.h

+2 −0
Original line number Diff line number Diff line
@@ -679,6 +679,7 @@ struct irq_chip_type { 
 * @num_ct:		Number of available irq_chip_type instances (usually 1)

 * @private:		Private data for non generic chip callbacks

 * @installed:		bitfield to denote installed interrupts

 * @unused:		bitfield to denote unused interrupts

 * @domain:		irq domain pointer

 * @list:		List head for keeping track of instances

 * @chip_types:		Array of interrupt irq_chip_types
@@ -702,6 +703,7 @@ struct irq_chip_generic { 
	unsigned int		num_ct;

	void			*private;

	unsigned long		installed;

	unsigned long		unused;

	struct irq_domain	*domain;

	struct list_head	list;

	struct irq_chip_type	chip_types[0];

kernel/irq/generic-chip.c

+3 −0
Original line number Diff line number Diff line
@@ -359,6 +359,9 @@ static int irq_map_generic_chip(struct irq_domain *d, unsigned int virq, 


	idx = hw_irq % dgc->irqs_per_chip;



	if (test_bit(idx, &gc->unused))

		return -ENOTSUPP;



	if (test_bit(idx, &gc->installed))

		return -EBUSY;