Input: usbtouchscreen - initialize PM mutex before using it

commit b55d996f057bf2e7ba9422a80b5e17e99860cb0b upstream.

Mutexes shall be initialized before they are used.

Fixes: 12e510dbc57b2 ("Input: usbtouchscreen - fix deadlock in autosuspend")
Reported-by: syzbot+199ea16c7f26418b4365@syzkaller.appspotmail.com
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c
index d61570d..48304e2 100644 (file)
--- a/drivers/input/touchscreen/usbtouchscreen.c
+++ b/drivers/input/touchscreen/usbtouchscreen.c
@@ -1672,6 +1672,8 @@ static int usbtouch_probe(struct usb_interface *intf,
        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)