genirq: record IRQ_LEVEL in irq_desc[]

Impact: fix __irq_set_trigger() for IRQ_LEVEL

When recording the irq trigger type, let's also make sure
that IRQ_LEVEL gets set correctly.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

kernel/irq/chip.c

@@ -124,6 +124,7 @@ int set_irq_type(unsigned int irq, unsigned int type)
 		return -ENODEV;
 	}
 
+	type &= IRQ_TYPE_SENSE_MASK;
 	if (type == IRQ_TYPE_NONE)
 		return 0;
 

kernel/irq/manage.c

@@ -370,16 +370,18 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
 		return 0;
 	}
 
-	ret = chip->set_type(irq, flags & IRQF_TRIGGER_MASK);
+	/* caller masked out all except trigger mode flags */
+	ret = chip->set_type(irq, flags);
 
 	if (ret)
 		pr_err("setting trigger mode %d for irq %u failed (%pF)\n",
-				(int)(flags & IRQF_TRIGGER_MASK),
-				irq, chip->set_type);
+				(int)flags, irq, chip->set_type);
 	else {
+		if (flags & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
+			flags |= IRQ_LEVEL;
 		/* note that IRQF_TRIGGER_MASK == IRQ_TYPE_SENSE_MASK */
-		desc->status &= ~IRQ_TYPE_SENSE_MASK;
-		desc->status |= flags & IRQ_TYPE_SENSE_MASK;
+		desc->status &= ~(IRQ_LEVEL | IRQ_TYPE_SENSE_MASK);
+		desc->status |= flags;
 	}
 
 	return ret;
@@ -459,7 +461,8 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
 
 		/* Setup the type (level, edge polarity) if configured: */
 		if (new->flags & IRQF_TRIGGER_MASK) {
-			ret = __irq_set_trigger(desc, irq, new->flags);
+			ret = __irq_set_trigger(desc, irq,
+					new->flags & IRQF_TRIGGER_MASK);
 
 			if (ret) {
 				spin_unlock_irqrestore(&desc->lock, flags);