diff options
| author | Zhang Bo <zbsdta@126.com> | 2018-02-05 14:56:21 -0800 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2018-02-09 16:15:45 -0800 |
| commit | ea4f7bd2aca9f68470e9aac0fc9432fd180b1fe7 (patch) | |
| tree | 0853e555970f6310b792cc009e42d33697a34f89 /drivers/input | |
| parent | 0004520af32fca8b40abe78c11654be4e9e20fdf (diff) | |
| download | linux-ea4f7bd2aca9f68470e9aac0fc9432fd180b1fe7.tar.bz2 | |
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>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/keyboard/matrix_keypad.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/input/keyboard/matrix_keypad.c b/drivers/input/keyboard/matrix_keypad.c index 1f316d66e6f7..41614c185918 100644 --- a/drivers/input/keyboard/matrix_keypad.c +++ b/drivers/input/keyboard/matrix_keypad.c @@ -218,8 +218,10 @@ static void matrix_keypad_stop(struct input_dev *dev) { 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; |