Change a few functions that only ever returned 0 to voids

These are internal functions, if we need them to return an error code we can
change that at any time. Meanwhile, if we only ever return 0 anyway we might
as well just make them voids to save on error paths.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Yong Bakos <ybakos@humanoriented.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

9 files changed, 52 insertions, 105 deletions

diff --git a/src/evdev-mt-touchpad-buttons.c b/src/evdev-mt-touchpad-buttons.c
index 85a355f..3c47746 100644
--- a/src/evdev-mt-touchpad-buttons.c
+++ b/src/evdev-mt-touchpad-buttons.c
@@ -452,7 +452,7 @@ tp_button_handle_event(struct tp_dispatch *tp,
 			  button_state_to_str(t->button.state));
 }
 
-int
+void
 tp_button_handle_state(struct tp_dispatch *tp, uint64_t time)
 {
 	struct tp_touch *t;
@@ -488,8 +488,6 @@ tp_button_handle_state(struct tp_dispatch *tp, uint64_t time)
 		if (tp->queued & TOUCHPAD_EVENT_BUTTON_PRESS)
 			tp_button_handle_event(tp, t, BUTTON_EVENT_PRESS, time);
 	}
-
-	return 0;
 }
 
 static void
@@ -500,7 +498,7 @@ tp_button_handle_timeout(uint64_t now, void *data)
 	tp_button_handle_event(t->tp, t, BUTTON_EVENT_TIMEOUT, now);
 }
 
-int
+void
 tp_process_button(struct tp_dispatch *tp,
 		  const struct input_event *e,
 		  uint64_t time)
@@ -513,7 +511,7 @@ tp_process_button(struct tp_dispatch *tp,
 		log_bug_kernel(libinput,
 			       "received %s button event on a clickpad\n",
 			       libevdev_event_code_get_name(EV_KEY, e->code));
-		return 0;
+		return;
 	}
 
 	if (e->value) {
@@ -523,8 +521,6 @@ tp_process_button(struct tp_dispatch *tp,
 		tp->buttons.state &= ~mask;
 		tp->queued |= TOUCHPAD_EVENT_BUTTON_RELEASE;
 	}
-
-	return 0;
 }
 
 void
@@ -831,7 +827,7 @@ tp_init_middlebutton_emulation(struct tp_dispatch *tp,
 				want_config_option);
 }
 
-int
+void
 tp_init_buttons(struct tp_dispatch *tp,
 		struct evdev_device *device)
 {
@@ -884,8 +880,6 @@ tp_init_buttons(struct tp_dispatch *tp,
 				    tp_libinput_context(tp),
 				    tp_button_handle_timeout, t);
 	}
-
-	return 0;
 }
 
 void
diff --git a/src/evdev-mt-touchpad-edge-scroll.c b/src/evdev-mt-touchpad-edge-scroll.c
index 610744a..22cb5ae 100644
--- a/src/evdev-mt-touchpad-edge-scroll.c
+++ b/src/evdev-mt-touchpad-edge-scroll.c
@@ -281,7 +281,7 @@ tp_edge_scroll_handle_timeout(uint64_t now, void *data)
 	tp_edge_scroll_handle_event(t->tp, t, SCROLL_EVENT_TIMEOUT);
 }
 
-int
+void
 tp_edge_scroll_init(struct tp_dispatch *tp, struct evdev_device *device)
 {
 	struct tp_touch *t;
@@ -316,8 +316,6 @@ tp_edge_scroll_init(struct tp_dispatch *tp, struct evdev_device *device)
 				    tp_libinput_context(tp),
 				    tp_edge_scroll_handle_timeout, t);
 	}
-
-	return 0;
 }
 
 void
diff --git a/src/evdev-mt-touchpad-gestures.c b/src/evdev-mt-touchpad-gestures.c
index a910bec..acfc875 100644
--- a/src/evdev-mt-touchpad-gestures.c
+++ b/src/evdev-mt-touchpad-gestures.c
@@ -621,7 +621,7 @@ tp_gesture_handle_state(struct tp_dispatch *tp, uint64_t time)
 	}
 }
 
-int
+void
 tp_init_gesture(struct tp_dispatch *tp)
 {
 	/* two-finger scrolling is always enabled, this flag just
@@ -634,7 +634,6 @@ tp_init_gesture(struct tp_dispatch *tp)
 	libinput_timer_init(&tp->gesture.finger_count_switch_timer,
 			    tp_libinput_context(tp),
 			    tp_gesture_finger_count_switch_timeout, tp);
-	return 0;
 }
 
 void
diff --git a/src/evdev-mt-touchpad-tap.c b/src/evdev-mt-touchpad-tap.c
index 232cd6a..c2b331c 100644
--- a/src/evdev-mt-touchpad-tap.c
+++ b/src/evdev-mt-touchpad-tap.c
@@ -1010,7 +1010,7 @@ tp_tap_config_get_default_draglock_enabled(struct libinput_device *device)
 	return tp_drag_lock_default(evdev);
 }
 
-int
+void
 tp_init_tap(struct tp_dispatch *tp)
 {
 	tp->tap.config.count = tp_tap_config_count;
@@ -1033,8 +1033,6 @@ tp_init_tap(struct tp_dispatch *tp)
 	libinput_timer_init(&tp->tap.timer,
 			    tp_libinput_context(tp),
 			    tp_tap_handle_timeout, tp);
-
-	return 0;
 }
 
 void
diff --git a/src/evdev-mt-touchpad.c b/src/evdev-mt-touchpad.c
index 87d81c5..fe0d4a4 100644
--- a/src/evdev-mt-touchpad.c
+++ b/src/evdev-mt-touchpad.c
@@ -1781,7 +1781,6 @@ tp_init_accel(struct tp_dispatch *tp)
 	struct evdev_device *device = tp->device;
 	int res_x, res_y;
 	struct motion_filter *filter;
-	int rc;
 
 	res_x = tp->device->abs.absinfo_x->resolution;
 	res_y = tp->device->abs.absinfo_y->resolution;
@@ -1805,9 +1804,7 @@ tp_init_accel(struct tp_dispatch *tp)
 	if (!filter)
 		return -1;
 
-	rc = evdev_device_init_pointer_acceleration(tp->device, filter);
-	if (rc != 0)
-		return rc;
+	evdev_device_init_pointer_acceleration(tp->device, filter);
 
 	/* we override the profile hooks for accel configuration with hooks
 	 * that don't allow selection of profiles */
@@ -1896,11 +1893,10 @@ tp_scroll_config_scroll_method_get_default_method(struct libinput_device *device
 	return tp_scroll_get_default_method(tp);
 }
 
-static int
+static void
 tp_init_scroll(struct tp_dispatch *tp, struct evdev_device *device)
 {
-	if (tp_edge_scroll_init(tp, device) != 0)
-		return -1;
+	tp_edge_scroll_init(tp, device);
 
 	evdev_init_natural_scroll(device);
 
@@ -1914,8 +1910,6 @@ tp_init_scroll(struct tp_dispatch *tp, struct evdev_device *device)
 	 /* In mm for touchpads with valid resolution, see tp_init_accel() */
 	tp->device->scroll.threshold = 0.0;
 	tp->device->scroll.direction_lock_threshold = 5.0;
-
-	return 0;
 }
 
 static int
@@ -1972,12 +1966,12 @@ tp_dwt_config_get_default(struct libinput_device *device)
 		LIBINPUT_CONFIG_DWT_DISABLED;
 }
 
-static int
+static void
 tp_init_dwt(struct tp_dispatch *tp,
 	    struct evdev_device *device)
 {
 	if (tp_dwt_device_is_blacklisted(device))
-		return 0;
+		return;
 
 	tp->dwt.config.is_available = tp_dwt_config_is_available;
 	tp->dwt.config.set_enabled = tp_dwt_config_set;
@@ -1986,10 +1980,10 @@ tp_init_dwt(struct tp_dispatch *tp,
 	tp->dwt.dwt_enabled = tp_dwt_default_enabled(tp);
 	device->base.config.dwt = &tp->dwt.config;
 
-	return 0;
+	return;
 }
 
-static int
+static void
 tp_init_palmdetect(struct tp_dispatch *tp,
 		   struct evdev_device *device)
 {
@@ -2002,23 +1996,21 @@ tp_init_palmdetect(struct tp_dispatch *tp,
 
 	/* Wacom doesn't have internal touchpads */
 	if (device->model_flags & EVDEV_MODEL_WACOM_TOUCHPAD)
-		return 0;
+		return;
 
 	/* Enable palm detection on touchpads >= 70 mm. Anything smaller
 	   probably won't need it, until we find out it does */
 	if (width/device->abs.absinfo_x->resolution < 70)
-		return 0;
+		return;
 
 	/* palm edges are 5% of the width on each side */
 	tp->palm.right_edge = device->abs.absinfo_x->maximum - width * 0.05;
 	tp->palm.left_edge = device->abs.absinfo_x->minimum + width * 0.05;
 
 	tp->palm.monitor_trackpoint = true;
-
-	return 0;
 }
 
-static int
+static void
 tp_init_sendevents(struct tp_dispatch *tp,
 		   struct evdev_device *device)
 {
@@ -2029,10 +2021,9 @@ tp_init_sendevents(struct tp_dispatch *tp,
 	libinput_timer_init(&tp->dwt.keyboard_timer,
 			    tp_libinput_context(tp),
 			    tp_keyboard_timeout, tp);
-	return 0;
 }
 
-static int
+static void
 tp_init_thumb(struct tp_dispatch *tp)
 {
 	struct evdev_device *device = tp->device;
@@ -2043,14 +2034,14 @@ tp_init_thumb(struct tp_dispatch *tp)
 	double threshold;
 
 	if (!tp->buttons.is_clickpad)
-		return 0;
+		return;
 
 	/* if the touchpad is less than 50mm high, skip thumb detection.
 	 * it's too small to meaningfully interact with a thumb on the
 	 * touchpad */
 	evdev_device_get_size(device, &w, &h);
 	if (h < 50)
-		return 0;
+		return;
 
 	tp->thumb.detect_thumbs = true;
 	tp->thumb.threshold = INT_MAX;
@@ -2086,8 +2077,6 @@ out:
 		  "thumb: enabled thumb detection%s on '%s'\n",
 		  tp->thumb.threshold != INT_MAX ? " (+pressure)" : "",
 		  device->devname);
-
-	return 0;
 }
 
 static int
@@ -2115,7 +2104,7 @@ error:
 	return -1;
 }
 
-static int
+static void
 tp_init_default_resolution(struct tp_dispatch *tp,
 			   struct evdev_device *device)
 {
@@ -2124,7 +2113,7 @@ tp_init_default_resolution(struct tp_dispatch *tp,
 	int xres, yres;
 
 	if (!device->abs.fake_resolution)
-		return 0 ;
+		return;
 
 	/* we only get here if
 	 * - the touchpad provides no resolution
@@ -2148,8 +2137,6 @@ tp_init_default_resolution(struct tp_dispatch *tp,
 	libevdev_set_abs_resolution(device->evdev, ABS_MT_POSITION_X, xres);
 	libevdev_set_abs_resolution(device->evdev, ABS_MT_POSITION_Y, yres);
 	device->abs.fake_resolution = 0;
-
-	return 0;
 }
 
 static inline void
@@ -2197,8 +2184,7 @@ tp_init(struct tp_dispatch *tp,
 	if (tp_sanity_check(tp, device) != 0)
 		return -1;
 
-	if (tp_init_default_resolution(tp, device) != 0)
-		return -1;
+	tp_init_default_resolution(tp, device);
 
 	if (tp_init_slots(tp, device) != 0)
 		return -1;
@@ -2217,29 +2203,14 @@ tp_init(struct tp_dispatch *tp,
 	if (tp_init_accel(tp) != 0)
 		return -1;
 
-	if (tp_init_tap(tp) != 0)
-		return -1;
-
-	if (tp_init_buttons(tp, device) != 0)
-		return -1;
-
-	if (tp_init_dwt(tp, device) != 0)
-		return -1;
-
-	if (tp_init_palmdetect(tp, device) != 0)
-		return -1;
-
-	if (tp_init_sendevents(tp, device) != 0)
-		return -1;
-
-	if (tp_init_scroll(tp, device) != 0)
-		return -1;
-
-	if (tp_init_gesture(tp) != 0)
-		return -1;
-
-	if (tp_init_thumb(tp) != 0)
-		return -1;
+	tp_init_tap(tp);
+	tp_init_buttons(tp, device);
+	tp_init_dwt(tp, device);
+	tp_init_palmdetect(tp, device);
+	tp_init_sendevents(tp, device);
+	tp_init_scroll(tp, device);
+	tp_init_gesture(tp);
+	tp_init_thumb(tp);
 
 	device->seat_caps |= EVDEV_DEVICE_POINTER;
 	if (tp->gesture.enabled)
diff --git a/src/evdev-mt-touchpad.h b/src/evdev-mt-touchpad.h
index fe1f1b3..24912aa 100644
--- a/src/evdev-mt-touchpad.h
+++ b/src/evdev-mt-touchpad.h
@@ -428,13 +428,13 @@ tp_touch_active(const struct tp_dispatch *tp, const struct tp_touch *t);
 int
 tp_tap_handle_state(struct tp_dispatch *tp, uint64_t time);
 
-int
+void
 tp_init_tap(struct tp_dispatch *tp);
 
 void
 tp_remove_tap(struct tp_dispatch *tp);
 
-int
+void
 tp_init_buttons(struct tp_dispatch *tp, struct evdev_device *device);
 
 void
@@ -445,7 +445,7 @@ tp_init_top_softbuttons(struct tp_dispatch *tp,
 void
 tp_remove_buttons(struct tp_dispatch *tp);
 
-int
+void
 tp_process_button(struct tp_dispatch *tp,
 		  const struct input_event *e,
 		  uint64_t time);
@@ -457,7 +457,7 @@ tp_release_all_buttons(struct tp_dispatch *tp,
 int
 tp_post_button_events(struct tp_dispatch *tp, uint64_t time);
 
-int
+void
 tp_button_handle_state(struct tp_dispatch *tp, uint64_t time);
 
 int
@@ -481,7 +481,7 @@ tp_tap_resume(struct tp_dispatch *tp, uint64_t time);
 bool
 tp_tap_dragging(const struct tp_dispatch *tp);
 
-int
+void
 tp_edge_scroll_init(struct tp_dispatch *tp, struct evdev_device *device);
 
 void
@@ -503,7 +503,7 @@ tp_edge_scroll_touch_active(const struct tp_dispatch *tp,
 uint32_t
 tp_touch_get_edge(const struct tp_dispatch *tp, const struct tp_touch *t);
 
-int
+void
 tp_init_gesture(struct tp_dispatch *tp);
 
 void
diff --git a/src/evdev-tablet.c b/src/evdev-tablet.c
index d751f2f..a47f9e8 100644
--- a/src/evdev-tablet.c
+++ b/src/evdev-tablet.c
@@ -1592,7 +1592,6 @@ tablet_init_accel(struct tablet_dispatch *tablet, struct evdev_device *device)
 {
 	const struct input_absinfo *x, *y;
 	struct motion_filter *filter;
-	int rc;
 
 	x = device->abs.absinfo_x;
 	y = device->abs.absinfo_y;
@@ -1602,9 +1601,7 @@ tablet_init_accel(struct tablet_dispatch *tablet, struct evdev_device *device)
 	if (!filter)
 		return -1;
 
-	rc = evdev_device_init_pointer_acceleration(device, filter);
-	if (rc != 0)
-		return rc;
+	evdev_device_init_pointer_acceleration(device, filter);
 
 	/* we override the profile hooks for accel configuration with hooks
 	 * that don't allow selection of profiles */
diff --git a/src/evdev.c b/src/evdev.c
index 3a7eda1..1af8d87 100644
--- a/src/evdev.c
+++ b/src/evdev.c
@@ -1145,7 +1145,7 @@ evdev_left_handed_get_default(struct libinput_device *device)
 	return 0;
 }
 
-int
+void
 evdev_init_left_handed(struct evdev_device *device,
 		       void (*change_to_left_handed)(struct evdev_device *))
 {
@@ -1157,8 +1157,6 @@ evdev_init_left_handed(struct evdev_device *device,
 	device->left_handed.enabled = false;
 	device->left_handed.want_enabled = false;
 	device->left_handed.change_to_enabled = change_to_left_handed;
-
-	return 0;
 }
 
 static uint32_t
@@ -1254,7 +1252,7 @@ evdev_scroll_get_default_button(struct libinput_device *device)
 	return 0;
 }
 
-static int
+static void
 evdev_init_button_scroll(struct evdev_device *device,
 			 void (*change_scroll_method)(struct evdev_device *))
 {
@@ -1274,8 +1272,6 @@ evdev_init_button_scroll(struct evdev_device *device,
 	device->scroll.button = evdev_scroll_get_default_button((struct libinput_device *)device);
 	device->scroll.want_button = device->scroll.button;
 	device->scroll.change_scroll_method = change_scroll_method;
-
-	return 0;
 }
 
 void
@@ -1407,19 +1403,13 @@ fallback_dispatch_create(struct libinput_device *device)
 
 	dispatch->interface = &fallback_interface;
 
-	if (evdev_device->left_handed.want_enabled &&
-	    evdev_init_left_handed(evdev_device,
-				   evdev_change_to_left_handed) == -1) {
-		free(dispatch);
-		return NULL;
-	}
+	if (evdev_device->left_handed.want_enabled)
+		evdev_init_left_handed(evdev_device,
+				       evdev_change_to_left_handed);
 
-	if (evdev_device->scroll.want_button &&
-	    evdev_init_button_scroll(evdev_device,
-				     evdev_change_scroll_method) == -1) {
-		free(dispatch);
-		return NULL;
-	}
+	if (evdev_device->scroll.want_button)
+		evdev_init_button_scroll(evdev_device,
+					 evdev_change_scroll_method);
 
 	if (evdev_device->scroll.natural_scrolling_enabled)
 		evdev_init_natural_scroll(evdev_device);
@@ -1564,7 +1554,9 @@ evdev_init_accel(struct evdev_device *device,
 	if (!filter)
 		return -1;
 
-	return evdev_device_init_pointer_acceleration(device, filter);
+	evdev_device_init_pointer_acceleration(device, filter);
+
+	return 0;
 }
 
 static int
@@ -1657,7 +1649,7 @@ evdev_accel_config_get_default_profile(struct libinput_device *libinput_device)
 	return LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE;
 }
 
-int
+void
 evdev_device_init_pointer_acceleration(struct evdev_device *device,
 				       struct motion_filter *filter)
 {
@@ -1677,8 +1669,6 @@ evdev_device_init_pointer_acceleration(struct evdev_device *device,
 		evdev_accel_config_set_speed(&device->base,
 			     evdev_accel_config_get_default_speed(&device->base));
 	}
-
-	return 0;
 }
 
 static inline int
diff --git a/src/evdev.h b/src/evdev.h
index f1133ee..9ddd8b3 100644
--- a/src/evdev.h
+++ b/src/evdev.h
@@ -319,7 +319,7 @@ void
 evdev_init_calibration(struct evdev_device *device,
 		       struct evdev_dispatch *dispatch);
 
-int
+void
 evdev_device_init_pointer_acceleration(struct evdev_device *device,
 				       struct motion_filter *filter);
 
@@ -498,7 +498,7 @@ evdev_convert_to_mm(const struct input_absinfo *absinfo, double v)
 	return value/absinfo->resolution;
 }
 
-int
+void
 evdev_init_left_handed(struct evdev_device *device,
 		       void (*change_to_left_handed)(struct evdev_device *));