[PATCH 1/3] ARM: SAMSUNG: add entry and exit functions for uart interrupt chained handler

[Changhwan Youn]

This functions are added for properly controlling primary controller
in uart interrupt chained handler.

Signed-off-by: Changhwan Youn <chaos.youn at samsung.com>
---
 arch/arm/plat-samsung/irq-uart.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/arm/plat-samsung/irq-uart.c b/arch/arm/plat-samsung/irq-uart.c
index 4e77035..24da4d4 100644
--- a/arch/arm/plat-samsung/irq-uart.c
+++ b/arch/arm/plat-samsung/irq-uart.c
@@ -23,6 +23,7 @@
 #include <plat/irq-uart.h>
 #include <plat/regs-serial.h>
 #include <plat/cpu.h>
+#include <asm/mach/irq.h>
 
 /* Note, we make use of the fact that the parent IRQs, IRQ_UART[0..3]
  * are consecutive when looking up the interrupt in the demux routines.
@@ -86,6 +87,9 @@ static void s3c_irq_demux_uart(unsigned int irq, struct irq_desc *desc)
 	struct s3c_uart_irq *uirq = desc->irq_data.handler_data;
 	u32 pend = __raw_readl(uirq->regs + S3C64XX_UINTP);
 	int base = uirq->base_irq;
+	struct irq_chip *chip = get_irq_chip(irq);
+
+	chained_irq_enter(chip, desc);
 
 	if (pend & (1 << 0))
 		generic_handle_irq(base);
@@ -95,6 +99,8 @@ static void s3c_irq_demux_uart(unsigned int irq, struct irq_desc *desc)
 		generic_handle_irq(base + 2);
 	if (pend & (1 << 3))
 		generic_handle_irq(base + 3);
+
+	chained_irq_exit(chip, desc);
 }
 
 static struct irq_chip s3c_irq_uart = {
-- 
1.7.1