[RFC 2/2] warn on shared edge-triggered irq

[Stephen Hemminger]

Put out a warning if setting up shared irq that is edge triggered.
If this happens, interrupts can be lost, but perhaps it is laptop
with unused device, so let it go till later.


--- irq.orig/kernel/irq/manage.c
+++ irq/kernel/irq/manage.c
@@ -234,6 +234,9 @@ int setup_irq(unsigned int irq, struct i
 			desc->handler->startup(irq);
 		else
 			desc->handler->enable(irq);
+	} else if (!(desc->status & IRQ_LEVEL)) {
+		printk(KERN_CRIT "Irq %d (%s) is shared but not level triggered\n",
+		       irq, desc->handler->typename);
 	}
 	spin_unlock_irqrestore(&desc->lock,flags);
 
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