Input: synaptics - do not abuse -1 as return value

Let's stop using -1 as a universal return value and instead propagate
errors from underlying calls up the stack.

Reviewed-by: Benjamin Tissoires <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/mouse/synaptics.c

···
 static int synaptics_mode_cmd(struct psmouse *psmouse, unsigned char mode)
 {
 	unsigned char param[1];
+	int error;
 
-	if (psmouse_sliced_command(psmouse, mode))
-		return -1;
+	error = psmouse_sliced_command(psmouse, mode);
+	if (error)
+		return error;
+
 	param[0] = SYN_PS_SET_MODE2;
-	if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_SETRATE))
-		return -1;
+	error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_SETRATE);
+	if (error)
+		return error;
+
 	return 0;
 }
 
···
 {
 	static unsigned char param = 0xc8;
 	struct synaptics_data *priv = psmouse->private;
+	int error;
 
 	if (!(SYN_CAP_ADV_GESTURE(priv->info.ext_cap_0c) ||
 	      SYN_CAP_IMAGE_SENSOR(priv->info.ext_cap_0c)))
 		return 0;
 
-	if (psmouse_sliced_command(psmouse, SYN_QUE_MODEL))
-		return -1;
+	error = psmouse_sliced_command(psmouse, SYN_QUE_MODEL);
+	if (error)
+		return error;
 
-	if (ps2_command(&psmouse->ps2dev, &param, PSMOUSE_CMD_SETRATE))
-		return -1;
+	error = ps2_command(&psmouse->ps2dev, &param, PSMOUSE_CMD_SETRATE);
+	if (error)
+		return error;
 
 	/* Advanced gesture mode also sends multi finger data */
 	priv->info.capabilities |= BIT(1);
···
 static int synaptics_set_mode(struct psmouse *psmouse)
 {
 	struct synaptics_data *priv = psmouse->private;
+	int error;
 
 	priv->mode = 0;
 	if (priv->absolute_mode)
···
 	if (SYN_CAP_EXTENDED(priv->info.capabilities))
 		priv->mode |= SYN_BIT_W_MODE;
 
-	if (synaptics_mode_cmd(psmouse, priv->mode))
-		return -1;
+	error = synaptics_mode_cmd(psmouse, priv->mode);
+	if (error)
+		return error;
 
-	if (priv->absolute_mode &&
-	    synaptics_set_advanced_gesture_mode(psmouse)) {
-		psmouse_err(psmouse, "Advanced gesture mode init failed.\n");
-		return -1;
+	if (priv->absolute_mode) {
+		error = synaptics_set_advanced_gesture_mode(psmouse);
+		if (error) {
+			psmouse_err(psmouse,
+				    "Advanced gesture mode init failed: %d\n",
+				    error);
+			return error;
+		}
 	}
 
 	return 0;
···
 static int synaptics_pt_write(struct serio *serio, unsigned char c)
 {
 	struct psmouse *parent = serio_get_drvdata(serio->parent);
-	char rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */
+	u8 rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */
+	int error;
 
-	if (psmouse_sliced_command(parent, c))
-		return -1;
-	if (ps2_command(&parent->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE))
-		return -1;
+	error = psmouse_sliced_command(parent, c);
+	if (error)
+		return error;
+
+	error = ps2_command(&parent->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE);
+	if (error)
+		return error;
+
 	return 0;
 }
 
···
 	} while (error && ++retry < 3);
 
 	if (error)
-		return -1;
+		return error;
 
 	if (retry > 1)
 		psmouse_dbg(psmouse, "reconnected after %d tries\n", retry);
 
-	if (synaptics_query_hardware(psmouse, &info)) {
+	error = synaptics_query_hardware(psmouse, &info);
+	if (error) {
 		psmouse_err(psmouse, "Unable to query device.\n");
-		return -1;
+		return error;
 	}
 
-	if (synaptics_set_mode(psmouse)) {
+	error = synaptics_set_mode(psmouse);
+	if (error) {
 		psmouse_err(psmouse, "Unable to initialize device.\n");
-		return -1;
+		return error;
 	}
 
 	if (info.identity != priv->info.identity ||
···
 			    priv->info.model_id, info.model_id,
 			    priv->info.capabilities, info.capabilities,
 			    priv->info.ext_cap, info.ext_cap);
-		return -1;
+		return -ENXIO;
 	}
 
 	return 0;