Input: matrix_keypad - fix race when disabling interrupts
authorZhang Bo <zbsdta@126.com>
Mon, 5 Feb 2018 22:56:21 +0000 (14:56 -0800)
committerDmitry Torokhov <dmitry.torokhov@gmail.com>
Sat, 10 Feb 2018 00:15:45 +0000 (16:15 -0800)
commitea4f7bd2aca9f68470e9aac0fc9432fd180b1fe7
tree0853e555970f6310b792cc009e42d33697a34f89
parent0004520af32fca8b40abe78c11654be4e9e20fdf
Input: matrix_keypad - fix race when disabling interrupts

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>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
drivers/input/keyboard/matrix_keypad.c