This is a note to let you know that I've just added the patch titled
gpio/lynxpoint: check if the interrupt is enabled in IRQ handler
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
gpio-lynxpoint-check-if-the-interrupt-is-enabled-in-irq-handler.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 03d152d5582abc8a1c19cb107164c3724bbd4be4 Mon Sep 17 00:00:00 2001
From: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Date: Tue, 1 Oct 2013 17:35:43 +0300
Subject: gpio/lynxpoint: check if the interrupt is enabled in IRQ handler
From: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
commit 03d152d5582abc8a1c19cb107164c3724bbd4be4 upstream.
Checking LP_INT_STAT is not enough in the interrupt handler because its
contents get updated regardless of whether the pin has interrupt enabled or
not. This causes the driver to loop forever for GPIOs that are pulled up.
Fix this by checking the interrupt enable bit for the pin as well.
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Acked-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpio/gpio-lynxpoint.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/gpio/gpio-lynxpoint.c
+++ b/drivers/gpio/gpio-lynxpoint.c
@@ -248,14 +248,15 @@ static void lp_gpio_irq_handler(unsigned
struct lp_gpio *lg = irq_data_get_irq_handler_data(data);
struct irq_chip *chip = irq_data_get_irq_chip(data);
u32 base, pin, mask;
- unsigned long reg, pending;
+ unsigned long reg, ena, pending;
unsigned virq;
/* check from GPIO controller which pin triggered the interrupt */
for (base = 0; base < lg->chip.ngpio; base += 32) {
reg = lp_gpio_reg(&lg->chip, base, LP_INT_STAT);
+ ena = lp_gpio_reg(&lg->chip, base, LP_INT_ENABLE);
- while ((pending = inl(reg))) {
+ while ((pending = (inl(reg) & inl(ena)))) {
pin = __ffs(pending);
mask = BIT(pin);
/* Clear before handling so we don't lose an edge */
Patches currently in stable-queue which might be from mika.westerberg@xxxxxxxxxxxxxxx are
queue-3.11/gpio-lynxpoint-check-if-the-interrupt-is-enabled-in-irq-handler.patch
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