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irq: add remove_irq() for freeing of setup_irq() irqs

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Impact: add new API

This patch adds a remove_irq() function for releasing
interrupts requested with setup_irq().

Without this patch we have no way of releasing such
interrupts since free_irq() today tries to kfree()
the irqaction passed with setup_irq().

Signed-off-by: Magnus Damm <damm@igel.co.jp>
LKML-Reference: <20090312120542.2926.56609.sendpatchset@rx1.opensource.se>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Magnus Damm 2009-03-12 21:05:42 +09:00 committed by Ingo Molnar
parent f8cb22cbb8
commit f21cfb258d
2 changed files with 27 additions and 13 deletions
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1
include/linux/irq.h
View file

@ -236,6 +236,7 @@ typedef struct irq_desc irq_desc_t;
#include <asm/hw_irq.h>
extern int setup_irq(unsigned int irq, struct irqaction *new);
extern struct irqaction *remove_irq(unsigned int irq, void *dev_id);
#ifdef CONFIG_GENERIC_HARDIRQS

39
kernel/irq/manage.c
View file

@ -551,20 +551,14 @@ int setup_irq(unsigned int irq, struct irqaction *act)
}
/**
* free_irq - free an interrupt
* remove_irq - free an interrupt
* @irq: Interrupt line to free
* @dev_id: Device identity to free
*
* Remove an interrupt handler. The handler is removed and if the
* interrupt line is no longer in use by any driver it is disabled.
* On a shared IRQ the caller must ensure the interrupt is disabled
* on the card it drives before calling this function. The function
* does not return until any executing interrupts for this IRQ
* have completed.
*
* This function must not be called from interrupt context.
* Used to remove interrupts statically setup by the early boot process.
*/
void free_irq(unsigned int irq, void *dev_id)
struct irqaction *remove_irq(unsigned int irq, void *dev_id)
{
struct irq_desc *desc = irq_to_desc(irq);
struct irqaction *action, **action_ptr;
@ -573,7 +567,7 @@ void free_irq(unsigned int irq, void *dev_id)
WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
if (!desc)
return;
return NULL;
spin_lock_irqsave(&desc->lock, flags);
@ -589,7 +583,7 @@ void free_irq(unsigned int irq, void *dev_id)
WARN(1, "Trying to free already-free IRQ %d\n", irq);
spin_unlock_irqrestore(&desc->lock, flags);
return;
return NULL;
}
if (action->dev_id == dev_id)
@ -636,7 +630,26 @@ void free_irq(unsigned int irq, void *dev_id)
local_irq_restore(flags);
}
#endif
kfree(action);
return action;
}
/**
* free_irq - free an interrupt allocated with request_irq
* @irq: Interrupt line to free
* @dev_id: Device identity to free
*
* Remove an interrupt handler. The handler is removed and if the
* interrupt line is no longer in use by any driver it is disabled.
* On a shared IRQ the caller must ensure the interrupt is disabled
* on the card it drives before calling this function. The function
* does not return until any executing interrupts for this IRQ
* have completed.
*
* This function must not be called from interrupt context.
*/
void free_irq(unsigned int irq, void *dev_id)
{
kfree(remove_irq(irq, dev_id));
}
EXPORT_SYMBOL(free_irq);