Input: elantech - trust firmware about trackpoint presence

Only try to parse data as coming from trackpoint if firmware told us that
trackpoint is present.

Fixes commit caeb0d37fa3e387eb0dd22e5d497523c002033d1

Reported-and-tested-by: Marcus Overhagen <marcus.overhagen@gmail.com>
Reported-and-tested-by: Anders Kaseorg <andersk@mit.edu>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 1 insertions, 9 deletions

diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
index 3fcb6b3cb0bd..f2b978026407 100644
--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c
@@ -428,14 +428,6 @@ static void elantech_report_trackpoint(struct psmouse *psmouse,
         int x, y;
         u32 t;
 
-        if (dev_WARN_ONCE(&psmouse->ps2dev.serio->dev,
-                          !tp_dev,
-                          psmouse_fmt("Unexpected trackpoint message\n"))) {
-                if (etd->debug == 1)
-                        elantech_packet_dump(psmouse);
-                return;
-        }
-
         t = get_unaligned_le32(&packet[0]);
 
         switch (t & ~7U) {
@@ -793,7 +785,7 @@ static int elantech_packet_check_v4(struct psmouse *psmouse)
         unsigned char packet_type = packet[3] & 0x03;
         bool sanity_check;
 
-        if ((packet[3] & 0x0f) == 0x06)
+        if (etd->tp_dev && (packet[3] & 0x0f) == 0x06)
                 return PACKET_TRACKPOINT;
 
         /*