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Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull irq fix from Ingo Molnar.

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq: Allow irq chips to mark themself oneshot safe
This commit is contained in:
Linus Torvalds 2012-08-03 10:56:44 -07:00
commit 148311d2ad
2 changed files with 15 additions and 1 deletions
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1
include/linux/irq.h
View File

@ -349,6 +349,7 @@ enum {
IRQCHIP_MASK_ON_SUSPEND = (1 << 2),
IRQCHIP_ONOFFLINE_ENABLED = (1 << 3),
IRQCHIP_SKIP_SET_WAKE = (1 << 4),
IRQCHIP_ONESHOT_SAFE = (1 << 5),
};
/* This include will go away once we isolated irq_desc usage to core code */

15
kernel/irq/manage.c
View File

@ -943,6 +943,18 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
goto out_thread;
}
/*
* Drivers are often written to work w/o knowledge about the
* underlying irq chip implementation, so a request for a
* threaded irq without a primary hard irq context handler
* requires the ONESHOT flag to be set. Some irq chips like
* MSI based interrupts are per se one shot safe. Check the
* chip flags, so we can avoid the unmask dance at the end of
* the threaded handler for those.
*/
if (desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)
new->flags &= ~IRQF_ONESHOT;
/*
* The following block of code has to be executed atomically
*/
@ -1017,7 +1029,8 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
*/
new->thread_mask = 1 << ffz(thread_mask);
} else if (new->handler == irq_default_primary_handler) {
} else if (new->handler == irq_default_primary_handler &&
!(desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)) {
/*
* The interrupt was requested with handler = NULL, so
* we use the default primary handler for it. But it