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authorThomas Gleixner <tglx@linutronix.de>2009-08-17 08:07:16 -0400
committerThomas Gleixner <tglx@linutronix.de>2009-08-18 11:22:43 -0400
commit69ab849439b506cd8dd2879527fdb64d95dd5211 (patch)
tree059fba8bcb8147fafcd4e86db61f0f88d6a84095 /kernel
parent2d860ad76f4ee4d2eba0fe3797c8d7cdce432cc0 (diff)
genirq: Wake up irq thread after action has been installed
The wake_up_process() of the new irq thread in __setup_irq() is too early as the irqaction is not yet fully initialized especially action->irq is not yet set. The interrupt thread might dereference the wrong irq descriptor. Move the wakeup after the action is installed and action->irq has been set. Reported-by: Michael Buesch <mb@bu3sch.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Michael Buesch <mb@bu3sch.de>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/irq/manage.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index d222515a5a0..0ec9ed83173 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -607,7 +607,6 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
607 */ 607 */
608 get_task_struct(t); 608 get_task_struct(t);
609 new->thread = t; 609 new->thread = t;
610 wake_up_process(t);
611 } 610 }
612 611
613 /* 612 /*
@@ -690,6 +689,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
690 (int)(new->flags & IRQF_TRIGGER_MASK)); 689 (int)(new->flags & IRQF_TRIGGER_MASK));
691 } 690 }
692 691
692 new->irq = irq;
693 *old_ptr = new; 693 *old_ptr = new;
694 694
695 /* Reset broken irq detection when installing new handler */ 695 /* Reset broken irq detection when installing new handler */
@@ -707,7 +707,13 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
707 707
708 spin_unlock_irqrestore(&desc->lock, flags); 708 spin_unlock_irqrestore(&desc->lock, flags);
709 709
710 new->irq = irq; 710 /*
711 * Strictly no need to wake it up, but hung_task complains
712 * when no hard interrupt wakes the thread up.
713 */
714 if (new->thread)
715 wake_up_process(new->thread);
716
711 register_irq_proc(irq, desc); 717 register_irq_proc(irq, desc);
712 new->dir = NULL; 718 new->dir = NULL;
713 register_handler_proc(irq, new); 719 register_handler_proc(irq, new);