[PATCH v2] Input: synaptics_i2c - guard polling restart in resume

[Minseong Kim]

synaptics_i2c_resume() restarts delayed work unconditionally, even when
the input device is not opened. Guard the polling restart by taking the
input device mutex and checking input_device_enabled() before re-queuing
the delayed work.

Fixes: eef3e4cab72ea ("Input: add driver for Synaptics I2C touchpad")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Minseong Kim <ii4gsp@xxxxxxxxx>
---
 drivers/input/mouse/synaptics_i2c.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/input/mouse/synaptics_i2c.c b/drivers/input/mouse/synaptics_i2c.c
index a0d707e47d93..fc65e28c1b31 100644
--- a/drivers/input/mouse/synaptics_i2c.c
+++ b/drivers/input/mouse/synaptics_i2c.c
@@ -615,13 +615,17 @@ static int synaptics_i2c_resume(struct device *dev)
 	int ret;
 	struct i2c_client *client = to_i2c_client(dev);
 	struct synaptics_i2c *touch = i2c_get_clientdata(client);
+	struct input_dev *input = touch->input;
 
 	ret = synaptics_i2c_reset_config(client);
 	if (ret)
 		return ret;
 
-	mod_delayed_work(system_wq, &touch->dwork,
+	mutex_lock(&input->mutex);
+	if (input_device_enabled(input))
+		mod_delayed_work(system_wq, &touch->dwork,
 				msecs_to_jiffies(NO_DATA_SLEEP_MSECS));
+	mutex_unlock(&input->mutex);
 
 	return 0;
 }
-- 
2.48.1