| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.6 40/96] Input: wacom_w8001 - ignore invalid pen data packets | Date | Mon, 8 Aug 2016 21:11:03 +0200 |
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4.6-stable review patch. If anyone has any objections, please let me know.
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From: Ping Cheng <pinglinux@gmail.com>
commit 9e72ac7492149a229ce9039c680849cb682d7092 upstream.
ThinkPad X60 Tablet PC (pen only device) sometime posts packets that are larger than W8001_PKTLEN_TPCPEN.
Reported-by: Chris J Arges <christopherarges@gmail.com> Tested-by: Chris J Arges <christopherarges@gmail.com> Signed-off-by: Ping Cheng <pingc@wacom.com> Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/input/touchscreen/wacom_w8001.c | 9 +++++++++ 1 file changed, 9 insertions(+)
--- a/drivers/input/touchscreen/wacom_w8001.c +++ b/drivers/input/touchscreen/wacom_w8001.c @@ -339,6 +339,15 @@ static irqreturn_t w8001_interrupt(struc w8001->idx = 0; parse_multi_touch(w8001); break; + + default: + /* + * ThinkPad X60 Tablet PC (pen only device) sometimes + * 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;
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