linux-kernel - [PATCH RFC 2/2] IRQ: Modularize the setup

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Message-ID: <20071005053658.GB3435@Ahmed>
Date:	Fri, 5 Oct 2007 07:36:58 +0200
From:	"Ahmed S. Darwish" <darwish.07@...il.com>
To:	tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: [PATCH RFC 2/2] IRQ: Modularize the setup_irq code (2)

Introduce irq_desc_match_fist_irqaction() to support setup_irq() 
code modularity.

Signed-off-by: Ahmed S. Darwish <darwish.07@...il.com>
---

Any ideas for a better method name ?

 manage.c |   89 ++++++++++++++++++++++++++++++++++++---------------------------
 1 file changed, 51 insertions(+), 38 deletions(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 6a0d778..4e96d56 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -293,6 +293,55 @@ int can_add_irqaction_on_allocated_irq(unsigned int irq, struct irqaction *new)
 }
 
 /*
+ * Configure the passed irq descriptor to satisfy our first newly
+ * added irqaction needs
+ * must be called with the irq_desc[irq]->lock held
+ */
+void irq_desc_match_fist_irqaction(unsigned int irq, struct irqaction *new)
+{
+	struct irq_desc *desc = irq_desc + irq;
+
+	/* We must be the first and the only irqaction */
+	BUG_ON(desc->action != new || new->next);
+
+	irq_chip_set_defaults(desc->chip);
+
+#if defined(CONFIG_IRQ_PER_CPU)
+	if (new->flags & IRQF_PERCPU)
+		desc->status |= IRQ_PER_CPU;
+#endif
+
+	/* Setup the type (level, edge polarity) if configured: */
+	if (new->flags & IRQF_TRIGGER_MASK) {
+		if (desc->chip && desc->chip->set_type)
+			desc->chip->set_type(irq,
+					     new->flags & IRQF_TRIGGER_MASK);
+		else
+			/*
+			 * IRQF_TRIGGER_* but the PIC does not support
+			 * multiple flow-types?
+			 */
+			printk(KERN_WARNING "No IRQF_TRIGGER set_type "
+			       "function for IRQ %d (%s)\n", irq,
+			       desc->chip ? desc->chip->name : "unknown");
+	} else
+		compat_irq_chip_set_default_handler(desc);
+
+	desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING | IRQ_INPROGRESS);
+
+	if (!(desc->status & IRQ_NOAUTOEN)) {
+		desc->depth = 0;
+		desc->status &= ~IRQ_DISABLED;
+		if (desc->chip->startup)
+			desc->chip->startup(irq);
+		else
+			desc->chip->enable(irq);
+	} else
+		/* Undo nested disables: */
+		desc->depth = 1;
+}
+
+/*
  * Internal function to register an irqaction - typically used to
  * allocate special interrupts that are part of the architecture.
  */
@@ -352,45 +401,9 @@ int setup_irq(unsigned int irq, struct irqaction *new)
 	if (new->flags & IRQF_NOBALANCING)
 		desc->status |= IRQ_NO_BALANCING;
 
-	if (!shared) {
-		irq_chip_set_defaults(desc->chip);
+	if (!shared)
+		irq_desc_match_fist_irqaction(irq, new);
 
-#if defined(CONFIG_IRQ_PER_CPU)
-		if (new->flags & IRQF_PERCPU)
-			desc->status |= IRQ_PER_CPU;
-#endif
-
-		/* Setup the type (level, edge polarity) if configured: */
-		if (new->flags & IRQF_TRIGGER_MASK) {
-			if (desc->chip && desc->chip->set_type)
-				desc->chip->set_type(irq,
-						new->flags & IRQF_TRIGGER_MASK);
-			else
-				/*
-				 * IRQF_TRIGGER_* but the PIC does not support
-				 * multiple flow-types?
-				 */
-				printk(KERN_WARNING "No IRQF_TRIGGER set_type "
-				       "function for IRQ %d (%s)\n", irq,
-				       desc->chip ? desc->chip->name :
-				       "unknown");
-		} else
-			compat_irq_chip_set_default_handler(desc);
-
-		desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING |
-				  IRQ_INPROGRESS);
-
-		if (!(desc->status & IRQ_NOAUTOEN)) {
-			desc->depth = 0;
-			desc->status &= ~IRQ_DISABLED;
-			if (desc->chip->startup)
-				desc->chip->startup(irq);
-			else
-				desc->chip->enable(irq);
-		} else
-			/* Undo nested disables: */
-			desc->depth = 1;
-	}
 	/* Reset broken irq detection when installing new handler */
 	desc->irq_count = 0;
 	desc->irqs_unhandled = 0;

-- 
Ahmed S. Darwish
HomePage: http://darwish.07.googlepages.com
Blog: http://darwish-07.blogspot.com
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