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authorPing Cheng <pinglinux@gmail.com>2016-06-23 10:55:11 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2016-06-23 13:38:45 -0700
commit9e72ac7492149a229ce9039c680849cb682d7092 (patch)
tree9cb12623238ce9b1ae7cdee435f2aa3aeaed1594 /drivers/input
parent12afb34400eb2b301f06b2aa3535497d14faee59 (diff)
downloadop-kernel-dev-9e72ac7492149a229ce9039c680849cb682d7092.zip
op-kernel-dev-9e72ac7492149a229ce9039c680849cb682d7092.tar.gz
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: 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>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/touchscreen/wacom_w8001.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/wacom_w8001.c b/drivers/input/touchscreen/wacom_w8001.c
index b1b4127..0c9191c 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) 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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