diff options
| author |   Thomas Gleixner <tglx@linutronix.de> | 2011-02-07 10:34:30 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2011-02-19 12:58:09 +0100 |
| commit | fe200ae48ef5c79bf7941fe8046ff9505c570ff6 (patch) | |
| tree | 767d2cf011437a266a655ce2ec39360cb85f7f28 /include/linux/irq.h | |
| parent | genirq: spurious: Run only one poller at a time (diff) | |
| download | linux-dev-fe200ae48ef5c79bf7941fe8046ff9505c570ff6.tar.xz linux-dev-fe200ae48ef5c79bf7941fe8046ff9505c570ff6.zip | |
genirq: Mark polled irqs and defer the real handler
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>
Diffstat (limited to 'include/linux/irq.h')
| -rw-r--r-- | include/linux/irq.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h index f5e900309d21..e32b64ccdc89 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -71,6 +71,7 @@ typedef void (*irq_flow_handler_t)(unsigned int irq, #define IRQ_SUSPENDED 0x04000000 /* IRQ has gone through suspend sequence */ #define IRQ_ONESHOT 0x08000000 /* IRQ is not unmasked after hardirq */ #define IRQ_NESTED_THREAD 0x10000000 /* IRQ is nested into another, no own handler thread */ +#define IRQ_POLL_INPROGRESS 0x20000000 /* IRQ poll is in progress */ #define IRQF_MODIFY_MASK \ (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \ |