From 599808d6a87caa19b21f48a0dd8f4e576d17ee6c Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Wed, 4 Oct 2006 02:16:30 -0700
Subject: [PATCH] --- yaml --- r: 38413 b: refs/heads/master c:
 0be6652f1e61b647f738eb25af057bf9551a9841 h: refs/heads/master i:   38411:
 e93e3614397b16bbce51a108221998f8eb55c8d6 v: v3

---
 [refs]                             |  2 +-
 trunk/arch/x86_64/kernel/io_apic.c | 36 +++++++++++++++++++++++++++---
 2 files changed, 34 insertions(+), 4 deletions(-)

diff --git a/[refs] b/[refs]
index 8f09841c0dee..2ba977da9115 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e7b946e98a456077dd6897f726f3d6197bd7e3b9
+refs/heads/master: 0be6652f1e61b647f738eb25af057bf9551a9841
diff --git a/trunk/arch/x86_64/kernel/io_apic.c b/trunk/arch/x86_64/kernel/io_apic.c
index e1d1b4217cb2..12dd938f5d54 100644
--- a/trunk/arch/x86_64/kernel/io_apic.c
+++ b/trunk/arch/x86_64/kernel/io_apic.c
@@ -1254,18 +1254,48 @@ static int ioapic_retrigger_vector(unsigned int vector)
  * races.
  */
 
-static void ack_apic(unsigned int vector)
+static void ack_apic(unsigned int irq)
 {
 	ack_APIC_irq();
 }
 
+static void ack_apic_edge(unsigned int irq)
+{
+	move_native_irq(irq);
+	ack_APIC_irq();
+}
+
+static void ack_apic_level(unsigned int irq)
+{
+	int do_unmask_irq = 0;
+
+#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
+	/* If we are moving the irq we need to mask it */
+	if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) {
+		do_unmask_irq = 1;
+		mask_IO_APIC_irq(irq);
+	}
+#endif
+
+	/*
+	 * We must acknowledge the irq before we move it or the acknowledge will
+	 * not propogate properly.
+	 */
+	ack_APIC_irq();
+
+	/* Now we can move and renable the irq */
+	move_masked_irq(irq);
+	if (unlikely(do_unmask_irq))
+		unmask_IO_APIC_irq(irq);
+}
+
 static struct irq_chip ioapic_chip __read_mostly = {
 	.name 		= "IO-APIC",
 	.startup 	= startup_ioapic_vector,
 	.mask	 	= mask_ioapic_vector,
 	.unmask	 	= unmask_ioapic_vector,
-	.ack 		= ack_apic,
-	.eoi 		= ack_apic,
+	.ack 		= ack_apic_edge,
+	.eoi 		= ack_apic_level,
 #ifdef CONFIG_SMP
 	.set_affinity 	= set_ioapic_affinity_vector,
 #endif