Fixed the irq interrupt line after a resume from

Hi all

Ad I said in a previous email the current hibernation suppont has a problem with every interrupt line enabled in the previous session by modules.

This kind of irq line after a resume will remain not initialized in the interrupt controller.

The attached patch is a hack to close the issue ( and it works).
I know it isn't a wonderful solution and it has to be taken as a momentary solution. The right thing should be add sysdev device to the intc but it requires more work in the intc design.

Let me know.
Regards
Francesco

From 8dd0655b55843957a06f6d2297e07322570b647d Mon Sep 17 00:00:00 2001
From: Francesco Virlinzi <[email protected]>
Date: Wed, 18 Mar 2009 09:25:37 +0100
Subject: [PATCH] sh_irq: Added setup irq line support on hibernation

This patch fixes the irq line status after a resume from hibernation. This is required for all the irq line required from every module loaded during the runtime of previous session and not initialized during the system boots.

---
 arch/sh/kernel/swsusp.c |   25 +++++++++++++++++++++++++
 1 files changed, 25 insertions(+), 0 deletions(-)

index 12b64a0..3f383a2 100644
@@ -11,6 +11,8 @@
 #include <linux/mm.h>
 #include <linux/sched.h>
 #include <linux/suspend.h>
+#include <linux/irqflags.h>
+#include <linux/irq.h>
 #include <asm/suspend.h>
 #include <asm/sections.h>
 #include <asm/tlbflush.h>

@@ -34,5 +36,28 @@ void save_processor_state(void)
 
 void restore_processor_state(void)
 {
+	int i;
+	unsigned long flags;
+	struct irq_desc *desc;
+	void (*irq_func)(unsigned int irq);
+
+	/* now restore the hw irq setting */
+	local_irq_save(flags);
+	for (i = 0; i < NR_IRQS; ++i) {
+		desc = &irq_desc[i];
+		if (desc->chip != &no_irq_chip && desc->action) {
+			irq_func = (desc->status & IRQ_DISABLED) ?
+				desc->chip->disable : desc->chip->enable;
+			spin_lock(&desc->lock);
+			desc->chip->startup(i);
+			irq_func(i);
+			if (desc->chip->set_wake)
+				desc->chip->set_wake(i,
+					((desc->status & IRQ_WAKEUP) ? 1 : 0));
+			spin_unlock(&desc->lock);
+		}       /* if.. */
+	}               /* for... */
+	local_irq_restore(flags);
+
 	local_flush_tlb_all();
 }

1.5.6.6