>From 5732ab12201cff25f036e1e20dc23fdb779c8589 Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@atomide.com>
Date: Thu, 9 Oct 2008 15:25:16 +0300
Subject: [PATCH] Read INTC_REVISION after write to ensure write is posted

Based on Russell's earlier patch at:

http://www.mail-archive.com/linux-omap@vger.kernel.org/msg02904.html

diff --git a/arch/arm/mach-omap2/irq.c b/arch/arm/mach-omap2/irq.c
index 4ffb4f1..3ae3c8c 100644
--- a/arch/arm/mach-omap2/irq.c
+++ b/arch/arm/mach-omap2/irq.c
@@ -64,6 +64,7 @@ static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg)
 static void omap_ack_irq(unsigned int irq)
 {
 	intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL);
+	intc_bank_read_reg(&irq_banks[0], INTC_REVISION);
 }
 
 static void omap_mask_irq(unsigned int irq)
@@ -73,6 +74,7 @@ static void omap_mask_irq(unsigned int irq)
 	irq &= (IRQ_BITS_PER_REG - 1);
 
 	intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_SET0 + offset);
+	intc_bank_read_reg(&irq_banks[0], INTC_REVISION);
 }
 
 static void omap_unmask_irq(unsigned int irq)