[PATCH 03/19] pinctrl: sunxi: Always call chained_irq_{enter, exit} in sunxi_pinctrl_irq_handler

[Frank Lee]

From: Yangtao Li <fr...@allwinnertech.com>

It is found on many allwinner soc that there is a low probability that
the interrupt status cannot be read in sunxi_pinctrl_irq_handler. This
will cause the interrupt status of a gpio bank to always be active on
gic, preventing gic from responding to other spi interrupts correctly.

So we should call the chained_irq_* each time enter sunxi_pinctrl_irq_handler().

Cc: sta...@vger.kernel.org
Signed-off-by: Yangtao Li <fr...@allwinnertech.com>
---
 drivers/pinctrl/sunxi/pinctrl-sunxi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c 
b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
index 9d8b59dafa4b..dc8d39ae045b 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
@@ -1141,20 +1141,22 @@ static void sunxi_pinctrl_irq_handler(struct irq_desc 
*desc)
 
        WARN_ON(bank == pctl->desc->irq_banks);
 
+       chained_irq_enter(chip, desc);
+
        reg = sunxi_irq_status_reg_from_bank(pctl->desc, bank);
        val = readl(pctl->membase + reg);
 
        if (val) {
                int irqoffset;
 
-               chained_irq_enter(chip, desc);
                for_each_set_bit(irqoffset, &val, IRQ_PER_BANK) {
                        int pin_irq = irq_find_mapping(pctl->domain,
                                                       bank * IRQ_PER_BANK + 
irqoffset);
                        generic_handle_irq(pin_irq);
                }
-               chained_irq_exit(chip, desc);
        }
+
+       chained_irq_exit(chip, desc);
 }
 
 static int sunxi_pinctrl_add_function(struct sunxi_pinctrl *pctl,
-- 
2.28.0