Commit d5eb4ad2 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

genirq: Implement irq_get/put_desc_[bus]locked/unlock() 



Most of the managing functions get the irq descriptor and lock it -
either with or without buslock. Instead of open coding this over and
over provide a common function to do that.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 091738a2

kernel/irq/internals.h

+28 −0
Original line number Diff line number Diff line
@@ -126,6 +126,34 @@ static inline void chip_bus_sync_unlock(struct irq_desc *desc) 
		desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);

}



struct irq_desc *

__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus);

void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);



static inline struct irq_desc *

irq_get_desc_buslock(unsigned int irq, unsigned long *flags)

{

	return __irq_get_desc_lock(irq, flags, true);

}



static inline void

irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)

{

	__irq_put_desc_unlock(desc, flags, true);

}



static inline struct irq_desc *

irq_get_desc_lock(unsigned int irq, unsigned long *flags)

{

	return __irq_get_desc_lock(irq, flags, false);

}



static inline void

irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)

{

	__irq_put_desc_unlock(desc, flags, false);

}



/*

 * Manipulation functions for irq_data.state

 */

kernel/irq/irqdesc.c

+20 −0
Original line number Diff line number Diff line
@@ -402,6 +402,26 @@ unsigned int irq_get_next_irq(unsigned int offset) 
	return find_next_bit(allocated_irqs, nr_irqs, offset);

}



struct irq_desc *

__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus)

{

	struct irq_desc *desc = irq_to_desc(irq);



	if (desc) {

		if (bus)

			chip_bus_lock(desc);

		raw_spin_lock_irqsave(&desc->lock, *flags);

	}

	return desc;

}



void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)

{

	raw_spin_unlock_irqrestore(&desc->lock, flags);

	if (bus)

		chip_bus_sync_unlock(desc);

}



/**

 * dynamic_irq_cleanup - cleanup a dynamically allocated irq

 * @irq:	irq number to initialize