Patch "HID: wacom: Properly report negative values from Intuos Pro 2 Bluetooth" has been added to the 4.13-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    HID: wacom: Properly report negative values from Intuos Pro 2 Bluetooth

to the 4.13-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     hid-wacom-properly-report-negative-values-from-intuos-pro-2-bluetooth.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From b63c4c2718d641ba9bec888994f0cb0c23a1ef45 Mon Sep 17 00:00:00 2001
From: Jason Gerecke <killertofu@gmail.com>
Date: Wed, 30 Aug 2017 15:13:25 -0700
Subject: HID: wacom: Properly report negative values from Intuos Pro 2 Bluetooth

From: Jason Gerecke <killertofu@gmail.com>

commit b63c4c2718d641ba9bec888994f0cb0c23a1ef45 upstream.

The wacom driver's IRQ handler for Bluetooth reports from the 2nd-gen
Intuos Pro does not correctly process negative numbers. Values for
tilt and rotation (which can go negative) are instead interpreted as
unsigned and so jump to very large values when the data should be
negative. This commit properly casts the data to ensure we report
negative numbers when necessary.

Fixes: 4922cd2 ("HID: wacom: Support 2nd-gen Intuos Pro's Bluetooth classic interface")
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/hid/wacom_wac.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -1229,9 +1229,9 @@ static void wacom_intuos_pro2_bt_pen(str
 		if (range) {
 			input_report_abs(pen_input, ABS_X, get_unaligned_le16(&frame[1]));
 			input_report_abs(pen_input, ABS_Y, get_unaligned_le16(&frame[3]));
-			input_report_abs(pen_input, ABS_TILT_X, frame[7]);
-			input_report_abs(pen_input, ABS_TILT_Y, frame[8]);
-			input_report_abs(pen_input, ABS_Z, get_unaligned_le16(&frame[9]));
+			input_report_abs(pen_input, ABS_TILT_X, (char)frame[7]);
+			input_report_abs(pen_input, ABS_TILT_Y, (char)frame[8]);
+			input_report_abs(pen_input, ABS_Z, (int16_t)get_unaligned_le16(&frame[9]));
 			input_report_abs(pen_input, ABS_WHEEL, get_unaligned_le16(&frame[11]));
 		}
 		input_report_abs(pen_input, ABS_PRESSURE, get_unaligned_le16(&frame[5]));


Patches currently in stable-queue which might be from killertofu@gmail.com are

queue-4.13/hid-wacom-always-increment-hdev-refcount-within-wacom_get_hdev_data.patch
queue-4.13/hid-wacom-correct-coordinate-system-of-touchring-and-pen-twist.patch
queue-4.13/hid-wacom-properly-report-negative-values-from-intuos-pro-2-bluetooth.patch
queue-4.13/hid-wacom-bits-shifted-too-much-for-9th-and-10th-buttons.patch
queue-4.13/hid-wacom-generic-send-msc_serial-and-abs_misc-when-leaving-prox.patch
queue-4.13/hid-wacom-generic-clear-abs_misc-when-tool-leaves-proximity.patch