linux-kernel - [PATCH v2] gpio: pca953x: fix irq_stat not updated when irq is disabled (irq

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Message-Id: <20220506080630.4151-1-puyou.lu@gmail.com>
Date:   Fri,  6 May 2022 16:06:30 +0800
From:   Puyou Lu <puyou.lu@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     stable@...r.kernel.org, Puyou Lu <puyou.lu@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Marc Zyngier <maz@...terjones.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] gpio: pca953x: fix irq_stat not updated when irq is disabled (irq_mask not set)

When one port's input state get inverted (eg. from low to hight) after
pca953x_irq_setup but before setting irq_mask (by some other driver such as
"gpio-keys"), the next inversion of this port (eg. from hight to low) will not
be triggered any more (because irq_stat is not updated at the first time). Issue
should be fixed after this commit.

Fixes: 89ea8bbe9c3e ("gpio: pca953x.c: add interrupt handling capability")
Signed-off-by: Puyou Lu <puyou.lu@...il.com>

---

Change since v1:
add fixes tag and commit message https://lore.kernel.org/lkml/20220501092201.16411-1-puyou.lu@gmail.com/

---
 drivers/gpio/gpio-pca953x.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index d2fe76f3f34f..8726921a1129 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -762,11 +762,11 @@ static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pendin
 	bitmap_xor(cur_stat, new_stat, old_stat, gc->ngpio);
 	bitmap_and(trigger, cur_stat, chip->irq_mask, gc->ngpio);
 
+	bitmap_copy(chip->irq_stat, new_stat, gc->ngpio);
+
 	if (bitmap_empty(trigger, gc->ngpio))
 		return false;
 
-	bitmap_copy(chip->irq_stat, new_stat, gc->ngpio);
-
 	bitmap_and(cur_stat, chip->irq_trig_fall, old_stat, gc->ngpio);
 	bitmap_and(old_stat, chip->irq_trig_raise, new_stat, gc->ngpio);
 	bitmap_or(new_stat, old_stat, cur_stat, gc->ngpio);
-- 
2.17.1