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authorThomas Gleixner <tglx@linutronix.de>2009-08-17 14:07:16 +0200
committerThomas Gleixner <tglx@linutronix.de>2009-08-18 17:22:43 +0200
commit69ab849439b506cd8dd2879527fdb64d95dd5211 (patch)
tree059fba8bcb8147fafcd4e86db61f0f88d6a84095 /kernel/irq
parentgenirq: prevent wakeup of freed irq thread (diff)
downloadlinux-69ab849439b506cd8dd2879527fdb64d95dd5211.tar.xz
linux-69ab849439b506cd8dd2879527fdb64d95dd5211.zip
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/irq')
-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 d222515a5a06..0ec9ed831737 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)
*/
get_task_struct(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));
}
+ new->irq = irq;
*old_ptr = new;
/* 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);
- 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);
new->dir = NULL;
register_handler_proc(irq, new);