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authorThomas Gleixner <tglx@linutronix.de>2007-08-12 15:46:35 +0000
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-08-12 11:05:45 -0700
commit2464286ace55b3abddfb9cc30ab95e2dac1de9a6 (patch)
tree0ef5493e17325c99dc8bbb0c77d4eb4bf9944713
parent496634217e5671ed876a0348e9f5b7165e830b20 (diff)
genirq: suppress resend of level interrupts
Level type interrupts are resent by the interrupt hardware when they are still active at irq_enable(). Suppress the resend mechanism for interrupts marked as level. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/irq/resend.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c
index 5bfeaed7e487..a8046791ba2d 100644
--- a/kernel/irq/resend.c
+++ b/kernel/irq/resend.c
@@ -62,7 +62,12 @@ void check_irq_resend(struct irq_desc *desc, unsigned int irq)
*/
desc->chip->enable(irq);
- if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
+ /*
+ * We do not resend level type interrupts. Level type
+ * interrupts are resent by hardware when they are still
+ * active.
+ */
+ if ((status & (IRQ_LEVEL | IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
desc->status = (status & ~IRQ_PENDING) | IRQ_REPLAY;
if (!desc->chip || !desc->chip->retrigger ||