pinctrl: mediatek: fix dual-edge code defect

commit 5edf673d07fdcb6498be24914f3f38f8d8843199 upstream.

When a dual-edge irq is triggered, an incorrect irq will be reported on
condition that the external signal is not stable and this incorrect irq
has been registered.
Correct the register offset.

Signed-off-by: Hongkun Cao <hongkun.cao@mediatek.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
index 3d8019eb3d8476686584371e822411cb631552cb..181b35879ebd7d3f755d942cba18a1def04eb751 100644 (file)
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
@@ -1191,9 +1191,10 @@ static void mtk_eint_irq_handler(struct irq_desc *desc)
        const struct mtk_desc_pin *pin;
 
        chained_irq_enter(chip, desc);
-       for (eint_num = 0; eint_num < pctl->devdata->ap_num; eint_num += 32) {
+       for (eint_num = 0;
+            eint_num < pctl->devdata->ap_num;
+            eint_num += 32, reg += 4) {
                status = readl(reg);
-               reg += 4;
                while (status) {
                        offset = __ffs(status);
                        index = eint_num + offset;