HID: wacom: leds: Don't try to control the EKR's read-only LEDs

Commit a50aac7193f1 introduces 'led.groups' and adds EKR support
for these groups. However, unlike the other devices with LEDs,
the EKR's LEDs are read-only and we shouldn't attempt to control
them in wacom_led_control().

See bug: https://sourceforge.net/p/linuxwacom/bugs/342/

Fixes: a50aac7193f1 ("HID: wacom: leds: dynamically allocate LED groups")
Cc: stable <stable@vger.kernel.org>     # 4.9
Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index e82a696..735bfbb 100644 (file)
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -766,6 +766,9 @@ static int wacom_led_control(struct wacom *wacom)
        if (!wacom->led.groups)
                return -ENOTSUPP;
 
+       if (wacom->wacom_wac.features.type == REMOTE)
+               return -ENOTSUPP;
+
        if (wacom->wacom_wac.pid) { /* wireless connected */
                report_id = WAC_CMD_WL_LED_CONTROL;
                buf_size = 13;