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Input: wacom_w8001 - ignore invalid pen data packets

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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>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Ping Cheng 2016-06-23 10:55:11 -07:00 committed by Dmitry Torokhov
parent 12afb34400
commit 9e72ac7492
1 changed files with 9 additions and 0 deletions
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9
drivers/input/touchscreen/wacom_w8001.c
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@ -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) 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;