HID: core: do not scan constant input report

The Microsoft Surface Type/Touch Cover 2 is a fancy device which advertised
itself as a multitouch device but with constant input reports.
This way, hid_scan_report() gives the group MULTITOUCH to it, but
hid-multitouch can not handle it due to the constant collection ignored
by hid-input.

To prevent such crap in the future, and while we do not fix this particular
device, make the scan_report coherent with hid-input.c, and ignore constant
input reports.

CC: stable@vger.kernel.org # 3.12+
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 3f488ff88e0cf8478506da921785f04f68ce1f3a..10a2c08664596a3c43d1687cab911ad3fc3ab970 100644 (file)
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -718,6 +718,9 @@ static int hid_scan_main(struct hid_parser *parser, struct hid_item *item)
        case HID_MAIN_ITEM_TAG_END_COLLECTION:
                break;
        case HID_MAIN_ITEM_TAG_INPUT:
+               /* ignore constant inputs, they will be ignored by hid-input */
+               if (data & HID_MAIN_ITEM_CONSTANT)
+                       break;
                for (i = 0; i < parser->local.usage_index; i++)
                        hid_scan_input_usage(parser, parser->local.usage[i]);
                break;