linux-kernel - IRQ_NOAUTOEN in __set_irq

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Date:	Tue, 6 May 2008 14:43:43 +0200
From:	"Esben Haabendal" <esbenhaabendal@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: IRQ_NOAUTOEN in __set_irq_handler

Would it be possible to have support for IRQ_NOAUTOEN in
__set_irq_handler and thus set_irq_chained_handler?

Something like:

@@ -582,14 +582,19 @@ __set_irq_handler(unsigned int irq,
irq_flow_handler_t handle, int is_chained,
 	}
 	desc->handle_irq = handle;
 	desc->name = name;

 	if (handle != handle_bad_irq && is_chained) {
-		desc->status &= ~IRQ_DISABLED;
 		desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE;
-		desc->depth = 0;
-		desc->chip->unmask(irq);
+		if (!(desc->status & IRQ_NOAUTOEN)) {
+			desc->depth = 0;
+			desc->status &= ~IRQ_DISABLED;
+			desc->chip->unmask(irq);
+		} else {
+			/* Undo nested disables: */
+			desc->depth = 1;
+		}
 	}
 	spin_unlock_irqrestore(&desc->lock, flags);
 }

 void
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