[PATCH 4.19 14/91] Input: usbtouchscreen - initialize PM mutex before using it

From: Greg Kroah-Hartman
Date: Wed Aug 14 2019 - 13:22:23 EST


From: Oliver Neukum <oneukum@xxxxxxxx>

commit b55d996f057bf2e7ba9422a80b5e17e99860cb0b upstream.

Mutexes shall be initialized before they are used.

Fixes: 12e510dbc57b2 ("Input: usbtouchscreen - fix deadlock in autosuspend")
Reported-by: syzbot+199ea16c7f26418b4365@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/input/touchscreen/usbtouchscreen.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/input/touchscreen/usbtouchscreen.c
+++ b/drivers/input/touchscreen/usbtouchscreen.c
@@ -1672,6 +1672,8 @@ static int usbtouch_probe(struct usb_int
if (!usbtouch || !input_dev)
goto out_free;

+ mutex_init(&usbtouch->pm_mutex);
+
type = &usbtouch_dev_info[id->driver_info];
usbtouch->type = type;
if (!type->process_pkt)