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 <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
josf · Aug 12, 2007 · 2464286 · 2464286
1 parent 4966342
commit 2464286
Showing 1 changed file with 6 additions and 1 deletion.
diff --git 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 ||