This is a note to let you know that I've just added the patch titled
Input: matrix_keypad - fix race when disabling interrupts
to the 4.4-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:
input-matrix_keypad-fix-race-when-disabling-interrupts.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ea4f7bd2aca9f68470e9aac0fc9432fd180b1fe7 Mon Sep 17 00:00:00 2001
From: Zhang Bo <zbsdta@xxxxxxx>
Date: Mon, 5 Feb 2018 14:56:21 -0800
Subject: Input: matrix_keypad - fix race when disabling interrupts
From: Zhang Bo <zbsdta@xxxxxxx>
commit ea4f7bd2aca9f68470e9aac0fc9432fd180b1fe7 upstream.
If matrix_keypad_stop() is executing and the keypad interrupt is triggered,
disable_row_irqs() may be called by both matrix_keypad_interrupt() and
matrix_keypad_stop() at the same time, causing interrupts to be disabled
twice and the keypad being "stuck" after resuming.
Take lock when setting keypad->stopped to ensure that ISR will not race
with matrix_keypad_stop() disabling interrupts.
Signed-off-by: Zhang Bo <zbsdta@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/input/keyboard/matrix_keypad.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/input/keyboard/matrix_keypad.c
+++ b/drivers/input/keyboard/matrix_keypad.c
@@ -216,8 +216,10 @@ static void matrix_keypad_stop(struct in
{
struct matrix_keypad *keypad = input_get_drvdata(dev);
+ spin_lock_irq(&keypad->lock);
keypad->stopped = true;
- mb();
+ spin_unlock_irq(&keypad->lock);
+
flush_work(&keypad->work.work);
/*
* matrix_keypad_scan() will leave IRQs enabled;
Patches currently in stable-queue which might be from zbsdta@xxxxxxx are
queue-4.4/input-matrix_keypad-fix-race-when-disabling-interrupts.patch