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authorThomas Gleixner <tglx@linutronix.de>2011-02-23 23:52:16 (GMT)
committerThomas Gleixner <tglx@linutronix.de>2011-02-25 19:24:21 (GMT)
commit9d591edd02a245305b1b9379e4c5571bad4d2774 (patch)
tree1fdd608db6096afaf2696ff9878cb4b7096047f3 /kernel/irq
parentb5faba21a6805c33b40e258d36f57997ee1de131 (diff)
downloadlinux-9d591edd02a245305b1b9379e4c5571bad4d2774.tar.xz
genirq: Allow shared oneshot interrupts
Support ONESHOT on shared interrupts, if all drivers agree on it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <20110223234956.483640430@linutronix.de>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/manage.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 2301de1..58c8613 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -824,10 +824,6 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
rand_initialize_irq(irq);
}
- /* Oneshot interrupts are not allowed with shared */
- if ((new->flags & IRQF_ONESHOT) && (new->flags & IRQF_SHARED))
- return -EINVAL;
-
/*
* Check whether the interrupt nests into another interrupt
* thread.
@@ -881,10 +877,12 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
* Can't share interrupts unless both agree to and are
* the same type (level, edge, polarity). So both flag
* fields must have IRQF_SHARED set and the bits which
- * set the trigger type must match.
+ * set the trigger type must match. Also all must
+ * agree on ONESHOT.
*/
if (!((old->flags & new->flags) & IRQF_SHARED) ||
- ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK)) {
+ ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK) ||
+ ((old->flags ^ new->flags) & IRQF_ONESHOT)) {
old_name = old->name;
goto mismatch;
}