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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>
This commit is contained in:
Thomas Gleixner 2009-08-17 14:07:16 +02:00
parent 2d860ad76f
commit 69ab849439
1 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
kernel/irq/manage.c
View File

@ -607,7 +607,6 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
*/ */
get_task_struct(t); get_task_struct(t);
new->thread = t; new->thread = t;
wake_up_process(t);
} }
/* /*
@ -690,6 +689,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
(int)(new->flags & IRQF_TRIGGER_MASK)); (int)(new->flags & IRQF_TRIGGER_MASK));
} }
new->irq = irq;
*old_ptr = new; *old_ptr = new;
/* Reset broken irq detection when installing new handler */ /* Reset broken irq detection when installing new handler */
@ -707,7 +707,13 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
spin_unlock_irqrestore(&desc->lock, flags); spin_unlock_irqrestore(&desc->lock, flags);
new->irq = irq; /*
* Strictly no need to wake it up, but hung_task complains
* when no hard interrupt wakes the thread up.
*/
if (new->thread)
wake_up_process(new->thread);
register_irq_proc(irq, desc); register_irq_proc(irq, desc);
new->dir = NULL; new->dir = NULL;
register_handler_proc(irq, new); register_handler_proc(irq, new);