Commit 9e72ac74 authored by Ping Cheng's avatar Ping Cheng Committed by Dmitry Torokhov

Input: wacom_w8001 - ignore invalid pen data packets

ThinkPad X60 Tablet PC (pen only device) sometime posts
packets that are larger than W8001_PKTLEN_TPCPEN.
Reported-by: default avatarChris J Arges <christopherarges@gmail.com>
Tested-by: default avatarChris J Arges <christopherarges@gmail.com>
Signed-off-by: default avatarPing Cheng <pingc@wacom.com>
Reviewed-by: default avatarPeter Hutterer <peter.hutterer@who-t.net>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 12afb344
......@@ -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;
......
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