From: Zhang Bo Date: Mon, 5 Feb 2018 22:56:21 +0000 (-0800) Subject: Input: matrix_keypad - fix race when disabling interrupts X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=37ecb938a4cd48d87492c16ea3e7d843a9513b38 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 Signed-off-by: Dmitry Torokhov Signed-off-by: Ben Hutchings --- diff --git a/drivers/input/keyboard/matrix_keypad.c b/drivers/input/keyboard/matrix_keypad.c index e2ae657717ea..4389ed39dbed 100644 --- a/drivers/input/keyboard/matrix_keypad.c +++ b/drivers/input/keyboard/matrix_keypad.c @@ -214,8 +214,10 @@ 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;