From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@redhat.com>
Subject: [PATCH 4.14 03/29] HID: holtek: fix mouse probing
Date:   Mon, 27 Dec 2021 16:27:13 +0100
Message-Id: <20211227151318.587437067@linuxfoundation.org>
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From: Benjamin Tissoires <benjamin.tissoires@redhat.com>

commit 93a2207c254ca102ebbdae47b00f19bbfbfa7ecd upstream.

An overlook from the previous commit: we don't even parse or start the
device, meaning that the device is not presented to user space.

Fixes: 93020953d0fa ("HID: check for valid USB device for many HID drivers")
Cc: stable@vger.kernel.org
Link: https://bugs.archlinux.org/task/73048
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215341
Link: https://lore.kernel.org/r/e4efbf13-bd8d-0370-629b-6c80c0044b15@leemhuis.info/
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/hid/hid-holtek-mouse.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

--- a/drivers/hid/hid-holtek-mouse.c
+++ b/drivers/hid/hid-holtek-mouse.c
@@ -68,8 +68,23 @@ static __u8 *holtek_mouse_report_fixup(s
 static int holtek_mouse_probe(struct hid_device *hdev,
 			      const struct hid_device_id *id)
 {
+	int ret;
+
 	if (!hid_is_usb(hdev))
 		return -EINVAL;
+
+	ret = hid_parse(hdev);
+	if (ret) {
+		hid_err(hdev, "hid parse failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	if (ret) {
+		hid_err(hdev, "hw start failed: %d\n", ret);
+		return ret;
+	}
+
 	return 0;
 }