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

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Date:   Wed, 14 Aug 2019 19:00:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+199ea16c7f26418b4365@...kaller.appspotmail.com,
        Oliver Neukum <oneukum@...e.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [PATCH 4.19 14/91] Input: usbtouchscreen - initialize PM mutex before using it

From: Oliver Neukum <oneukum@...e.com>

commit b55d996f057bf2e7ba9422a80b5e17e99860cb0b upstream.

Mutexes shall be initialized before they are used.

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

---
 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)