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genirq: Mark polled irqs and defer the real handler

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With the chip.end() function gone we might run into a situation where
a poll call runs and the real interrupt comes in, sees IRQ_INPROGRESS
and disables the line. That might be a perfect working one, which will
then be masked forever.

So mark them polled while the poll runs. When the real handler sees
IRQ_INPROGRESS it checks the poll flag and waits for the polling to
complete. Add the necessary amount of sanity checks to it to avoid
deadlocks.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2011-02-07 10:34:30 +01:00
parent d05c65fff0
commit fe200ae48e
4 changed files with 61 additions and 28 deletions
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11
kernel/irq/internals.h
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@ -28,6 +28,7 @@ extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
/* Resending of interrupts :*/
void check_irq_resend(struct irq_desc *desc, unsigned int irq);
bool irq_wait_for_poll(struct irq_desc *desc);
#ifdef CONFIG_PROC_FS
extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
@ -47,16 +48,6 @@ extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
extern void irq_set_thread_affinity(struct irq_desc *desc);
#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
static inline void irq_end(unsigned int irq, struct irq_desc *desc)
{
if (desc->irq_data.chip && desc->irq_data.chip->end)
desc->irq_data.chip->end(irq);
}
#else
static inline void irq_end(unsigned int irq, struct irq_desc *desc) { }
#endif
/* Inline functions for support of irq chips on slow busses */
static inline void chip_bus_lock(struct irq_desc *desc)
{