From 37ecb938a4cd48d87492c16ea3e7d843a9513b38 Mon Sep 17 00:00:00 2001
From: Zhang Bo <zbsdta@126.com>
Date: Mon, 5 Feb 2018 14:56:21 -0800
Subject: [PATCH] Input: matrix_keypad - fix race when disabling interrupts

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@126.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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