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>

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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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1

include/linux/irq.h

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26

kernel/irq/chip.c

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11

kernel/irq/internals.h

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51

kernel/irq/spurious.c

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