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Commit 44247184 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

genirq: Provide status modifier 



Provide a irq_desc.status modifier function to cleanup the direct
access to irq_desc in arch and driver code.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarIngo Molnar <mingo@elte.hu>
parent 3a3856d0

include/linux/irq.h

+25 −2
Original line number Diff line number Diff line
@@ -72,6 +72,10 @@ typedef void (*irq_flow_handler_t)(unsigned int irq, 
#define IRQ_ONESHOT		0x08000000	/* IRQ is not unmasked after hardirq */

#define IRQ_NESTED_THREAD	0x10000000	/* IRQ is nested into another, no own handler thread */



#define IRQF_MODIFY_MASK	\

	(IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \

	 IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL)



#ifdef CONFIG_IRQ_PER_CPU

# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)

# define IRQ_NO_BALANCING_MASK	(IRQ_PER_CPU | IRQ_NO_BALANCING)
@@ -289,8 +293,27 @@ set_irq_chained_handler(unsigned int irq, 


extern void set_irq_nested_thread(unsigned int irq, int nest);



extern void set_irq_noprobe(unsigned int irq);

extern void set_irq_probe(unsigned int irq);

void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set);



static inline void irq_set_status_flags(unsigned int irq, unsigned long set)

{

	irq_modify_status(irq, 0, set);

}



static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr)

{

	irq_modify_status(irq, clr, 0);

}



static inline void set_irq_noprobe(unsigned int irq)

{

	irq_modify_status(irq, 0, IRQ_NOPROBE);

}



static inline void set_irq_probe(unsigned int irq)

{

	irq_modify_status(irq, IRQ_NOPROBE, 0);

}



/* Handle dynamic irq creation and destruction */

extern unsigned int create_irq_nr(unsigned int irq_want, int node);

kernel/irq/chip.c

+7 −19
Original line number Diff line number Diff line
@@ -851,32 +851,20 @@ set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, 
	__set_irq_handler(irq, handle, 0, name);

}



void set_irq_noprobe(unsigned int irq)

void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)

{

	struct irq_desc *desc = irq_to_desc(irq);

	unsigned long flags;



	if (!desc) {

		printk(KERN_ERR "Trying to mark IRQ%d non-probeable\n", irq);

	if (!desc)

		return;

	}



	raw_spin_lock_irqsave(&desc->lock, flags);

	desc->status |= IRQ_NOPROBE;

	raw_spin_unlock_irqrestore(&desc->lock, flags);

}



void set_irq_probe(unsigned int irq)

{

	struct irq_desc *desc = irq_to_desc(irq);

	unsigned long flags;



	if (!desc) {

		printk(KERN_ERR "Trying to mark IRQ%d probeable\n", irq);

		return;

	}

	/* Sanitize flags */

	set &= IRQF_MODIFY_MASK;

	clr &= IRQF_MODIFY_MASK;



	raw_spin_lock_irqsave(&desc->lock, flags);

	desc->status &= ~IRQ_NOPROBE;

	desc->status &= ~clr;

	desc->status |= set;

	raw_spin_unlock_irqrestore(&desc->lock, flags);

}