commit 8cb858aa11ea203f4c3affa6ee635aefe0d1c3e4
author Chung-yih Wang <cywang@chromium.org> Mon Apr 21 08:38:23 2014
committer chrome-internal-fetch <chrome-internal-fetch@google.com> Tue Apr 22 20:26:55 2014
tree 063b5ccd8c2fc41d5c9fe0e96fb292d1738c2d42
parent 328acb8a1b55c9091b173ee2f662126b6352c30f

libevdev_event.c: skip ABS_MT_SLOT sync for non-MT devices

BUG=chromium:365231
TEST=on device, connect a USB mouse, no (EE) messages like
    the following printed in /var/log/Xorg.0.log

(EE) cmt: USB Optical Mouse: EvdevProbeAbsinfo():228: ioctl EVIOCGABS(47) failed: Invalid argument

Change-Id: I0317a6448022a4d04415daaa3711c75e093fd03f
Reviewed-on: https://chromium-review.googlesource.com/195769
Reviewed-by: Chung-yih Wang <cywang@chromium.org>
Tested-by: Chung-yih Wang <cywang@chromium.org>
Commit-Queue: Chung-yih Wang <cywang@chromium.org>

src/libevdev_event.c

diff --git a/src/libevdev_event.c b/src/libevdev_event.c
index a633cf1..cd69ba8 100755
--- a/src/libevdev_event.c
+++ b/src/libevdev_event.c
@@ -399,9 +399,11 @@
         MT_Slot_Sync(device, &req);
     }
 
-    /* Get current slot id */
-    if (EvdevProbeAbsinfo(device, ABS_MT_SLOT) == Success)
+    /* Get current slot id for multi-touch devices*/
+    if (TestBit(ABS_MT_SLOT, device->info.abs_bitmask) &&
+        (EvdevProbeAbsinfo(device, ABS_MT_SLOT) == Success)) {
         MT_Slot_Set(device, device->info.absinfo[ABS_MT_SLOT].value);
+    }
 
     Event_Get_Time(&device->after_sync_time, device->info.is_monotonic);