1 files changed, 31 insertions, 7 deletions

diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 96b70a43515f..2e300a460556 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -294,7 +294,29 @@ static int synaptics_pt_write(struct serio *serio, unsigned char c)
         return 0;
 }
 
-static inline int synaptics_is_pt_packet(unsigned char *buf)
+static int synaptics_pt_start(struct serio *serio)
+{
+        struct psmouse *parent = serio_get_drvdata(serio->parent);
+        struct synaptics_data *priv = parent->private;
+
+        serio_pause_rx(parent->ps2dev.serio);
+        priv->pt_port = serio;
+        serio_continue_rx(parent->ps2dev.serio);
+
+        return 0;
+}
+
+static void synaptics_pt_stop(struct serio *serio)
+{
+        struct psmouse *parent = serio_get_drvdata(serio->parent);
+        struct synaptics_data *priv = parent->private;
+
+        serio_pause_rx(parent->ps2dev.serio);
+        priv->pt_port = NULL;
+        serio_continue_rx(parent->ps2dev.serio);
+}
+
+static int synaptics_is_pt_packet(unsigned char *buf)
 {
         return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
 }
@@ -315,9 +337,8 @@ static void synaptics_pass_pt_packet(struct serio *ptport, unsigned char *packet
 
 static void synaptics_pt_activate(struct psmouse *psmouse)
 {
-        struct serio *ptport = psmouse->ps2dev.serio->child;
-        struct psmouse *child = serio_get_drvdata(ptport);
         struct synaptics_data *priv = psmouse->private;
+        struct psmouse *child = serio_get_drvdata(priv->pt_port);
 
         /* adjust the touchpad to child's choice of protocol */
         if (child) {
@@ -345,6 +366,8 @@ static void synaptics_pt_create(struct psmouse *psmouse)
         strlcpy(serio->name, "Synaptics pass-through", sizeof(serio->name));
         strlcpy(serio->phys, "synaptics-pt/serio0", sizeof(serio->name));
         serio->write = synaptics_pt_write;
+        serio->start = synaptics_pt_start;
+        serio->stop = synaptics_pt_stop;
         serio->parent = psmouse->ps2dev.serio;
 
         psmouse->pt_activate = synaptics_pt_activate;
@@ -578,9 +601,10 @@ static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse)
                 if (unlikely(priv->pkt_type == SYN_NEWABS))
                         priv->pkt_type = synaptics_detect_pkt_type(psmouse);
 
-                if (SYN_CAP_PASS_THROUGH(priv->capabilities) && synaptics_is_pt_packet(psmouse->packet)) {
-                        if (psmouse->ps2dev.serio->child)
-                                synaptics_pass_pt_packet(psmouse->ps2dev.serio->child, psmouse->packet);
+                if (SYN_CAP_PASS_THROUGH(priv->capabilities) &&
+                    synaptics_is_pt_packet(psmouse->packet)) {
+                        if (priv->pt_port)
+                                synaptics_pass_pt_packet(priv->pt_port, psmouse->packet);
                 } else
                         synaptics_process_packet(psmouse);
 
@@ -731,7 +755,7 @@ int synaptics_init(struct psmouse *psmouse)
 
         psmouse->private = priv = kzalloc(sizeof(struct synaptics_data), GFP_KERNEL);
         if (!priv)
-                return -1;
+                return -ENOMEM;
 
         psmouse_reset(psmouse);