[PATCH 5.10 110/151] HID: wacom: Defer calculation of resolution until resolution_code is known

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5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jason Gerecke <jason.gerecke@xxxxxxxxx>

commit 1b8f9c1fb464968a5b18d3acc1da8c00bad24fad upstream.

The Wacom driver maps the HID_DG_TWIST usage to ABS_Z (rather than ABS_RZ)
for historic reasons. When the code to support twist was introduced in
commit 50066a042da5 ("HID: wacom: generic: Add support for height, tilt,
and twist usages"), we were careful to write it in such a way that it had
HID calculate the resolution of the twist axis assuming ABS_RZ instead
(so that we would get correct angular behavior). This was broken with
the introduction of commit 08a46b4190d3 ("HID: wacom: Set a default
resolution for older tablets"), which moved the resolution calculation
to occur *before* the adjustment from ABS_Z to ABS_RZ occurred.

This commit moves the calculation of resolution after the point that
we are finished setting things up for its proper use.

Signed-off-by: Jason Gerecke <jason.gerecke@xxxxxxxxx>
Fixes: 08a46b4190d3 ("HID: wacom: Set a default resolution for older tablets")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jiri Kosina <jkosina@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/hid/wacom_wac.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -1920,12 +1920,14 @@ static void wacom_map_usage(struct input
 	int fmax = field->logical_maximum;
 	unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
 	int resolution_code = code;
-	int resolution = hidinput_calc_abs_res(field, resolution_code);
+	int resolution;
 
 	if (equivalent_usage == HID_DG_TWIST) {
 		resolution_code = ABS_RZ;
 	}
 
+	resolution = hidinput_calc_abs_res(field, resolution_code);
+
 	if (equivalent_usage == HID_GD_X) {
 		fmin += features->offset_left;
 		fmax -= features->offset_right;






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