HID: hid-input: allow input_configured callback return errors

When configuring input device via input_configured callback we may
encounter errors (for example input_mt_init_slots() may fail). Instead
of continuing with half-initialized input device let's allow driver
indicate failures.
Signed-off-by: Jaikumar Ganesh <jaikumarg@android.com>
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Nikolai Kondrashov <Nikolai.Kondrashov@redhat.com>
Acked-by: Andrew Duggan <aduggan@synaptics.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-appleir.c

@@ -256,7 +256,7 @@ static int appleir_raw_event(struct hid_device *hid, struct hid_report *report,
 	return 0;
 }
 
-static void appleir_input_configured(struct hid_device *hid,
+static int appleir_input_configured(struct hid_device *hid,
 		struct hid_input *hidinput)
 {
 	struct input_dev *input_dev = hidinput->input;
@@ -275,6 +275,8 @@ static void appleir_input_configured(struct hid_device *hid,
 	for (i = 0; i < ARRAY_SIZE(appleir_key_table); i++)
 		set_bit(appleir->keymap[i], input_dev->keybit);
 	clear_bit(KEY_RESERVED, input_dev->keybit);
+
+	return 0;
 }
 
 static int appleir_input_mapping(struct hid_device *hid,

drivers/hid/hid-elo.c

@@ -37,7 +37,7 @@ static bool use_fw_quirk = true;
 module_param(use_fw_quirk, bool, S_IRUGO);
 MODULE_PARM_DESC(use_fw_quirk, "Do periodic pokes for broken M firmwares (default = true)");
 
-static void elo_input_configured(struct hid_device *hdev,
+static int elo_input_configured(struct hid_device *hdev,
 		struct hid_input *hidinput)
 {
 	struct input_dev *input = hidinput->input;
@@ -45,6 +45,8 @@ static void elo_input_configured(struct hid_device *hdev,
 	set_bit(BTN_TOUCH, input->keybit);
 	set_bit(ABS_PRESSURE, input->absbit);
 	input_set_abs_params(input, ABS_PRESSURE, 0, 256, 0, 0);
+
+	return 0;
 }
 
 static void elo_process_data(struct input_dev *input, const u8 *data, int size)

drivers/hid/hid-input.c

@@ -1510,8 +1510,9 @@ int hidinput_connect(struct hid_device *hid, unsigned int force)
 				 * UGCI) cram a lot of unrelated inputs into the
 				 * same interface. */
 				hidinput->report = report;
-				if (drv->input_configured)
-					drv->input_configured(hid, hidinput);
+				if (drv->input_configured &&
+				    drv->input_configured(hid, hidinput))
+					goto out_cleanup;
 				if (input_register_device(hidinput->input))
 					goto out_cleanup;
 				hidinput = NULL;
@@ -1532,8 +1533,9 @@ int hidinput_connect(struct hid_device *hid, unsigned int force)
 	}
 
 	if (hidinput) {
-		if (drv->input_configured)
-			drv->input_configured(hid, hidinput);
+		if (drv->input_configured &&
+		    drv->input_configured(hid, hidinput))
+			goto out_cleanup;
 		if (input_register_device(hidinput->input))
 			goto out_cleanup;
 	}

drivers/hid/hid-lenovo.c

@@ -848,7 +848,7 @@ static void lenovo_remove(struct hid_device *hdev)
 	hid_hw_stop(hdev);
 }
 
-static void lenovo_input_configured(struct hid_device *hdev,
+static int lenovo_input_configured(struct hid_device *hdev,
 		struct hid_input *hi)
 {
 	switch (hdev->product) {
@@ -863,6 +863,8 @@ static void lenovo_input_configured(struct hid_device *hdev,
 			}
 			break;
 	}
+
+	return 0;
 }
 
 

drivers/hid/hid-logitech-hidpp.c

@@ -1160,13 +1160,15 @@ static void hidpp_populate_input(struct hidpp_device *hidpp,
 		m560_populate_input(hidpp, input, origin_is_hid_core);
 }
 
-static void hidpp_input_configured(struct hid_device *hdev,
+static int hidpp_input_configured(struct hid_device *hdev,
 				struct hid_input *hidinput)
 {
 	struct hidpp_device *hidpp = hid_get_drvdata(hdev);
 	struct input_dev *input = hidinput->input;
 
 	hidpp_populate_input(hidpp, input, true);
+
+	return 0;
 }
 
 static int hidpp_raw_hidpp_event(struct hidpp_device *hidpp, u8 *data,

drivers/hid/hid-magicmouse.c

@@ -471,18 +471,22 @@ static int magicmouse_input_mapping(struct hid_device *hdev,
 	return 0;
 }
 
-static void magicmouse_input_configured(struct hid_device *hdev,
+static int magicmouse_input_configured(struct hid_device *hdev,
 		struct hid_input *hi)
 
 {
 	struct magicmouse_sc *msc = hid_get_drvdata(hdev);
+	int ret;
 
-	int ret = magicmouse_setup_input(msc->input, hdev);
+	ret = magicmouse_setup_input(msc->input, hdev);
 	if (ret) {
 		hid_err(hdev, "magicmouse setup input failed (%d)\n", ret);
 		/* clean msc->input to notify probe() of the failure */
 		msc->input = NULL;
+		return ret;
 	}
+
+	return 0;
 }
 
 

drivers/hid/hid-multitouch.c

@@ -725,12 +725,13 @@ static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
 		mt_sync_frame(td, report->field[0]->hidinput->input);
 }
 
-static void mt_touch_input_configured(struct hid_device *hdev,
+static int mt_touch_input_configured(struct hid_device *hdev,
 					struct hid_input *hi)
 {
 	struct mt_device *td = hid_get_drvdata(hdev);
 	struct mt_class *cls = &td->mtclass;
 	struct input_dev *input = hi->input;
+	int ret;
 
 	if (!td->maxcontacts)
 		td->maxcontacts = MT_DEFAULT_MAXCONTACT;
@@ -752,9 +753,12 @@ static void mt_touch_input_configured(struct hid_device *hdev,
 	if (td->is_buttonpad)
 		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
 
-	input_mt_init_slots(input, td->maxcontacts, td->mt_flags);
+	ret = input_mt_init_slots(input, td->maxcontacts, td->mt_flags);
+	if (ret)
+		return ret;
 
 	td->mt_flags = 0;
+	return 0;
 }
 
 static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
@@ -930,15 +934,19 @@ static void mt_post_parse(struct mt_device *td)
 		cls->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
 }
 
-static void mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
+static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
 {
 	struct mt_device *td = hid_get_drvdata(hdev);
 	char *name;
 	const char *suffix = NULL;
 	struct hid_field *field = hi->report->field[0];
+	int ret;
 
-	if (hi->report->id == td->mt_report_id)
-		mt_touch_input_configured(hdev, hi);
+	if (hi->report->id == td->mt_report_id) {
+		ret = mt_touch_input_configured(hdev, hi);
+		if (ret)
+			return ret;
+	}
 
 	/*
 	 * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
@@ -989,6 +997,8 @@ static void mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
 			hi->input->name = name;
 		}
 	}
+
+	return 0;
 }
 
 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)

drivers/hid/hid-ntrig.c

@@ -859,14 +859,14 @@ static int ntrig_event (struct hid_device *hid, struct hid_field *field,
 	return 1;
 }
 
-static void ntrig_input_configured(struct hid_device *hid,
+static int ntrig_input_configured(struct hid_device *hid,
 		struct hid_input *hidinput)
 
 {
 	struct input_dev *input = hidinput->input;
 
 	if (hidinput->report->maxfield < 1)
-		return;
+		return 0;
 
 	switch (hidinput->report->field[0]->application) {
 	case HID_DG_PEN:
@@ -890,6 +890,8 @@ static void ntrig_input_configured(struct hid_device *hid,
 							"N-Trig MultiTouch";
 		break;
 	}
+
+	return 0;
 }
 
 static int ntrig_probe(struct hid_device *hdev, const struct hid_device_id *id)

drivers/hid/hid-rmi.c

@@ -1173,7 +1173,7 @@ static int rmi_populate(struct hid_device *hdev)
 	return 0;
 }
 
-static void rmi_input_configured(struct hid_device *hdev, struct hid_input *hi)
+static int rmi_input_configured(struct hid_device *hdev, struct hid_input *hi)
 {
 	struct rmi_data *data = hid_get_drvdata(hdev);
 	struct input_dev *input = hi->input;
@@ -1185,10 +1185,10 @@ static void rmi_input_configured(struct hid_device *hdev, struct hid_input *hi)
 	hid_dbg(hdev, "Opening low level driver\n");
 	ret = hid_hw_open(hdev);
 	if (ret)
-		return;
+		return ret;
 
 	if (!(data->device_flags & RMI_DEVICE))
-		return;
+		return 0;
 
 	/* Allow incoming hid reports */
 	hid_device_io_start(hdev);
@@ -1228,7 +1228,9 @@ static void rmi_input_configured(struct hid_device *hdev, struct hid_input *hi)
 	input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 0x0f, 0, 0);
 	input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 0x0f, 0, 0);
 
-	input_mt_init_slots(input, data->max_fingers, INPUT_MT_POINTER);
+	ret = input_mt_init_slots(input, data->max_fingers, INPUT_MT_POINTER);
+	if (ret < 0)
+		goto exit;
 
 	if (data->button_count) {
 		__set_bit(EV_KEY, input->evbit);
@@ -1244,6 +1246,7 @@ static void rmi_input_configured(struct hid_device *hdev, struct hid_input *hi)
 exit:
 	hid_device_io_stop(hdev);
 	hid_hw_close(hdev);
+	return ret;
 }
 
 static int rmi_input_mapping(struct hid_device *hdev,

drivers/hid/hid-sony.c

@@ -1360,20 +1360,27 @@ static int sony_register_touchpad(struct hid_input *hi, int touch_count,
 	return 0;
 }
 
-static void sony_input_configured(struct hid_device *hdev,
+static int sony_input_configured(struct hid_device *hdev,
 					struct hid_input *hidinput)
 {
 	struct sony_sc *sc = hid_get_drvdata(hdev);
+	int ret;
 
 	/*
 	 * The Dualshock 4 touchpad supports 2 touches and has a
 	 * resolution of 1920x942 (44.86 dots/mm).
 	 */
 	if (sc->quirks & DUALSHOCK4_CONTROLLER) {
-		if (sony_register_touchpad(hidinput, 2, 1920, 942) != 0)
+		ret = sony_register_touchpad(hidinput, 2, 1920, 942);
+		if (ret) {
 			hid_err(sc->hdev,
-				"Unable to initialize multi-touch slots\n");
+				"Unable to initialize multi-touch slots: %d\n",
+				ret);
+			return ret;
 		}
+	}
+
+	return 0;
 }
 
 /*

drivers/hid/hid-uclogic.c

@@ -731,7 +731,7 @@ static int uclogic_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 	return 0;
 }
 
-static void uclogic_input_configured(struct hid_device *hdev,
+static int uclogic_input_configured(struct hid_device *hdev,
 		struct hid_input *hi)
 {
 	char *name;
@@ -741,7 +741,7 @@ static void uclogic_input_configured(struct hid_device *hdev,
 
 	/* no report associated (HID_QUIRK_MULTI_INPUT not set) */
 	if (!hi->report)
-		return;
+		return 0;
 
 	field = hi->report->field[0];
 
@@ -774,6 +774,8 @@ static void uclogic_input_configured(struct hid_device *hdev,
 			hi->input->name = name;
 		}
 	}
+
+	return 0;
 }
 
 /**

include/linux/hid.h

@@ -698,7 +698,7 @@ struct hid_driver {
 	int (*input_mapped)(struct hid_device *hdev,
 			struct hid_input *hidinput, struct hid_field *field,
 			struct hid_usage *usage, unsigned long **bit, int *max);
-	void (*input_configured)(struct hid_device *hdev,
+	int (*input_configured)(struct hid_device *hdev,
 				struct hid_input *hidinput);
 	void (*feature_mapping)(struct hid_device *hdev,
 			struct hid_field *field,