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Commit 8316e381 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

irq: further clean up the free_irq() code flow 



Linus noticed that the 'pp' variable can be eliminated
altogether, and the loop can be cleaned up further.

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent ae88a23b

kernel/irq/manage.c

+4 −7
Original line number Diff line number Diff line
@@ -575,7 +575,7 @@ int setup_irq(unsigned int irq, struct irqaction *act) 
void free_irq(unsigned int irq, void *dev_id)

{

	struct irq_desc *desc = irq_to_desc(irq);

	struct irqaction *action, **p, **pp;

	struct irqaction *action, **p;

	unsigned long flags;



	WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
@@ -592,7 +592,6 @@ void free_irq(unsigned int irq, void *dev_id) 
	p = &desc->action;

	for (;;) {

		action = *p;

		pp = p;



		if (!action) {

			WARN(1, "Trying to free already-free IRQ %d\n", irq);
@@ -601,15 +600,13 @@ void free_irq(unsigned int irq, void *dev_id) 
			return;

		}



		p = &action->next;

		if (action->dev_id != dev_id)

			continue;



		if (action->dev_id == dev_id)

			break;

		p = &action->next;

	}



	/* Found it - now remove it from the list of entries: */

	*pp = action->next;

	*p = action->next;



	/* Currently used only by UML, might disappear one day: */

#ifdef CONFIG_IRQ_RELEASE_METHOD