pinctrl: sirf: add lost chained_irq_enter and exit in sirfsoc_gpio_handle_irq

This patch fixes the chained irq hang issue, tested by DM9000 driver using
GPIO0-3(irqnr=131) as the external IRQ on SiRFmarco:
   $ cat /proc/interrupts
               CPU0       CPU1
     32:       1608          0       GIC  sirfsoc_timer0
     33:          0       3197       GIC  sirfsoc_timer1
     50:      10207          0       GIC  sirfsoc-uart
     56:          2          0       GIC  cc0e0000.i2c
     70:         44          0       GIC  mmc0
    131:        333          0  sirf-gpio-irq  eth0
    ...

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinctrl-sirf.c b/drivers/pinctrl/pinctrl-sirf.c
index 8bf781e8c35e..fa88655c5e96 100644
--- a/drivers/pinctrl/pinctrl-sirf.c
+++ b/drivers/pinctrl/pinctrl-sirf.c
@@ -24,6 +24,7 @@
 #include <linux/bitops.h>
 #include <linux/gpio.h>
 #include <linux/of_gpio.h>
+#include <asm/mach/irq.h>
 
 #define DRIVER_NAME "pinmux-sirf"
 
@@ -1427,6 +1428,9 @@ static void sirfsoc_gpio_handle_irq(unsigned int irq, struct irq_desc *desc)
         u32 status, ctrl;
         int idx = 0;
         unsigned int first_irq;
+        struct irq_chip *chip = irq_get_chip(irq);
+
+        chained_irq_enter(chip, desc);
 
         status = readl(bank->chip.regs + SIRFSOC_GPIO_INT_STATUS(bank->id));
         if (!status) {
@@ -1455,6 +1459,8 @@ static void sirfsoc_gpio_handle_irq(unsigned int irq, struct irq_desc *desc)
                 idx++;
                 status = status >> 1;
         }
+
+        chained_irq_exit(chip, desc);
 }
 
 static inline void sirfsoc_gpio_set_input(struct sirfsoc_gpio_bank *bank, unsigned ctrl_offset)