gpio: tegra: fix unbalanced chained_irq_enter/exit

When more than one GPIO IRQs are triggered simultaneously,
tegra_gpio_irq_handler() called chained_irq_exit() multiple
times for one chained_irq_enter().

Fixes: 3c92db9ac0ca3eee8e46e2424b6c074e2e394ad9
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
[Also changed the variable to a bool]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index 88529d3c06c9..506c6a67c5fc 100644
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -360,7 +360,7 @@ static void tegra_gpio_irq_handler(struct irq_desc *desc)
 {
         int port;
         int pin;
-        int unmasked = 0;
+        bool unmasked = false;
         int gpio;
         u32 lvl;
         unsigned long sta;
@@ -384,8 +384,8 @@ static void tegra_gpio_irq_handler(struct irq_desc *desc)
                          * before executing the handler so that we don't
                          * miss edges
                          */
-                        if (lvl & (0x100 << pin)) {
-                                unmasked = 1;
+                        if (!unmasked && lvl & (0x100 << pin)) {
+                                unmasked = true;
                                 chained_irq_exit(chip, desc);
                         }