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| author | Jason Gerecke <killertofu@gmail.com> | 2015-10-08 01:54:21 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2015-10-21 13:13:11 +0200 |
| commit | 499522c8c015de995aabce3d0f0bf4b9b17f44c3 (patch) | |
| tree | 71ee15c9be4502d28e4618e7316ce29299f606a7 /drivers/hid/hid-logitech-hidpp.c | |
| parent | HID: sensor-hub: Add quirk for Lenovo Yoga 2 with ITE Chips (diff) | |
| download | linux-499522c8c015de995aabce3d0f0bf4b9b17f44c3.tar.xz linux-499522c8c015de995aabce3d0f0bf4b9b17f44c3.zip | |
HID: wacom: Tie cached HID_DG_CONTACTCOUNT indices to report ID
The cached indicies 'cc_index' and 'cc_value_index' introduced in 1b5d514
are only valid for a single report ID. If a touchscreen has multiple
reports with a HID_DG_CONTACTCOUNT usage, its possible that the values
will not be correct for the report we're handling, resulting in an
incorrect value for 'num_expected'. This has been observed with the Cintiq
Companion 2.
To address this, we store the ID of the report those indicies are valid
for in a new 'cc_report' variable. Before using them to get the expected
contact count, we first check if the ID of the report we're processing
matches 'cc_report'. If it doesn't, we update the indicies to point to
the HID_DG_CONTACTCOUNT usage of the current report (if it has one).
Cc: stable@vger.kernel.org
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-logitech-hidpp.c')
0 files changed, 0 insertions, 0 deletions