The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From dba785798526a3282cc4d0f0ea751883715dbbb4 Mon Sep 17 00:00:00 2001
From: Puyou Lu <puyou.lu@xxxxxxxxx>
Date: Fri, 6 May 2022 16:06:30 +0800
Subject: [PATCH] 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@xxxxxxxxx>
Signed-off-by: Bartosz Golaszewski <brgl@xxxxxxxx>
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);
