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>

diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c
index 5bfeaed7e4872850049d40aef740d24b983adebf..a8046791ba2d3fde84853ac7a7bfbb0bbca07b84 100644 (file)
--- 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 ||