[PATCH 2/2] Input: wacom_w8001 - Ignore invalid pen data packets
flat view
STALE3765d
REVIEWED: 1 (0M)
From: Ping Cheng <hidden>
Date: 2016-05-24 03:04:39
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
1 review trailer.
ThinkPad X60 Tablet PC (pen only device) sometime posts packets that are larger than W8001_PKTLEN_TPCPEN. Reported-by: Chris J Arges <redacted> Tested-by: Chris J Arges <redacted> Signed-off-by: Ping Cheng <redacted> --- drivers/input/touchscreen/wacom_w8001.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/input/touchscreen/wacom_w8001.c b/drivers/input/touchscreen/wacom_w8001.c
index b1b4127..d5dcda2 100644
--- a/drivers/input/touchscreen/wacom_w8001.c
+++ b/drivers/input/touchscreen/wacom_w8001.c@@ -339,6 +339,15 @@ static irqreturn_t w8001_interrupt(struct serio *serio, w8001->idx = 0; parse_multi_touch(w8001); break; + + default: + /* + * ThinkPad X60 Tablet PC (pen only device) sometime sends + * invalid data packets that are larger than W8001_PKTLEN_TPCPEN. + * Let's start over again. + */ + if (!w8001->touch_dev && w8001->idx > W8001_PKTLEN_TPCPEN - 1) + w8001->idx = 0; } return IRQ_HANDLED;
--
1.9.1