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genirq: Provide a lockdep helper 

Some irq chips need to call genirq functions for nested chips from
their callbacks. That upsets lockdep. So they need to set a different
lock class for those nested chips. Provide a helper function to avoid
open access to irq_desc.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2011-03-22 17:08:15 +01:00
parent 3b90389128
commit d3e17deb17
1 changed files with 9 additions and 0 deletions
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9
include/linux/irqdesc.h
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@ -191,6 +191,15 @@ static inline void __set_irq_handler_unlocked(int irq,
desc->handle_irq = handler;
}
static inline void
irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
{
struct irq_desc *desc = irq_to_desc(irq);
if (desc)
lockdep_set_class(&desc->lock, class);
}
#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
static inline void
__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)