staging: vt6656: clean-up registers initialization error path

Avoid discarding function's return code during register initialization.
Handle it instead and return 0 on success or a negative errno value on
error.
Signed-off-by: Quentin Deslandes <quentin.deslandes@itdev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/main_usb.c

@@ -109,33 +109,38 @@ static void vnt_set_options(struct vnt_private *priv)
  */
 static int vnt_init_registers(struct vnt_private *priv)
 {
+	int ret = 0;
 	struct vnt_cmd_card_init *init_cmd = &priv->init_command;
 	struct vnt_rsp_card_init *init_rsp = &priv->init_response;
 	u8 antenna;
 	int ii;
-	int status = STATUS_SUCCESS;
 	u8 tmp;
 	u8 calib_tx_iq = 0, calib_tx_dc = 0, calib_rx_iq = 0;
 
 	dev_dbg(&priv->usb->dev, "---->INIbInitAdapter. [%d][%d]\n",
 		DEVICE_INIT_COLD, priv->packet_type);
 
-	if (!vnt_check_firmware_version(priv)) {
-		if (vnt_download_firmware(priv) == true) {
-			if (vnt_firmware_branch_to_sram(priv) == false) {
+	ret = vnt_check_firmware_version(priv);
+	if (ret) {
+		ret = vnt_download_firmware(priv);
+		if (ret) {
 			dev_dbg(&priv->usb->dev,
-					" vnt_firmware_branch_to_sram fail\n");
-				return false;
+				"Could not download firmware: %d.\n", ret);
+			goto end;
 		}
-		} else {
-			dev_dbg(&priv->usb->dev, "FIRMWAREbDownload fail\n");
-			return false;
+
+		ret = vnt_firmware_branch_to_sram(priv);
+		if (ret) {
+			dev_dbg(&priv->usb->dev,
+				"Could not branch to SRAM: %d.\n", ret);
+			goto end;
 		}
 	}
 
-	if (!vnt_vt3184_init(priv)) {
+	ret = vnt_vt3184_init(priv);
+	if (ret) {
 		dev_dbg(&priv->usb->dev, "vnt_vt3184_init fail\n");
-		return false;
+		goto end;
 	}
 
 	init_cmd->init_class = DEVICE_INIT_COLD;
@@ -146,28 +151,27 @@ static int vnt_init_registers(struct vnt_private *priv)
 	init_cmd->long_retry_limit = priv->long_retry_limit;
 
 	/* issue card_init command to device */
-	status = vnt_control_out(priv, MESSAGE_TYPE_CARDINIT, 0, 0,
+	ret = vnt_control_out(priv, MESSAGE_TYPE_CARDINIT, 0, 0,
 			      sizeof(struct vnt_cmd_card_init),
 			      (u8 *)init_cmd);
-	if (status != STATUS_SUCCESS) {
+	if (ret) {
 		dev_dbg(&priv->usb->dev, "Issue Card init fail\n");
-		return false;
+		goto end;
 	}
 
-	status = vnt_control_in(priv, MESSAGE_TYPE_INIT_RSP, 0, 0,
+	ret = vnt_control_in(priv, MESSAGE_TYPE_INIT_RSP, 0, 0,
 			     sizeof(struct vnt_rsp_card_init),
 			     (u8 *)init_rsp);
-	if (status != STATUS_SUCCESS) {
-		dev_dbg(&priv->usb->dev,
-			"Cardinit request in status fail!\n");
-		return false;
+	if (ret) {
+		dev_dbg(&priv->usb->dev, "Cardinit request in status fail!\n");
+		goto end;
 	}
 
 	/* local ID for AES functions */
-	status = vnt_control_in(priv, MESSAGE_TYPE_READ, MAC_REG_LOCALID,
+	ret = vnt_control_in(priv, MESSAGE_TYPE_READ, MAC_REG_LOCALID,
 			     MESSAGE_REQUEST_MACREG, 1, &priv->local_id);
-	if (status != STATUS_SUCCESS)
-		return false;
+	if (ret)
+		goto end;
 
 	/* do MACbSoftwareReset in MACvInitialize */
 
@@ -253,7 +257,9 @@ static int vnt_init_registers(struct vnt_private *priv)
 	}
 
 	/* Set initial antenna mode */
-	vnt_set_antenna_mode(priv, priv->rx_antenna_mode);
+	ret = vnt_set_antenna_mode(priv, priv->rx_antenna_mode);
+	if (ret)
+		goto end;
 
 	/* get Auto Fall Back type */
 	priv->auto_fb_ctrl = AUTO_FB_0;
@@ -275,33 +281,41 @@ static int vnt_init_registers(struct vnt_private *priv)
 				/* CR255, enable TX/RX IQ and
 				 * DC compensation mode
 				 */
-				vnt_control_out_u8(priv,
+				ret = vnt_control_out_u8(priv,
 							 MESSAGE_REQUEST_BBREG,
-						   0xff,
-						   0x03);
+							 0xff, 0x03);
+				if (ret)
+					goto end;
+
 				/* CR251, TX I/Q Imbalance Calibration */
-				vnt_control_out_u8(priv,
+				ret = vnt_control_out_u8(priv,
 							 MESSAGE_REQUEST_BBREG,
-						   0xfb,
-						   calib_tx_iq);
+							 0xfb, calib_tx_iq);
+				if (ret)
+					goto end;
+
 				/* CR252, TX DC-Offset Calibration */
-				vnt_control_out_u8(priv,
+				ret = vnt_control_out_u8(priv,
 							 MESSAGE_REQUEST_BBREG,
-						   0xfC,
-						   calib_tx_dc);
+							 0xfC, calib_tx_dc);
+				if (ret)
+					goto end;
+
 				/* CR253, RX I/Q Imbalance Calibration */
-				vnt_control_out_u8(priv,
+				ret = vnt_control_out_u8(priv,
 							 MESSAGE_REQUEST_BBREG,
-						   0xfd,
-						   calib_rx_iq);
+							 0xfd, calib_rx_iq);
+				if (ret)
+					goto end;
 			} else {
 				/* CR255, turn off
 				 * BB Calibration compensation
 				 */
-				vnt_control_out_u8(priv,
+				ret = vnt_control_out_u8(priv,
 							 MESSAGE_REQUEST_BBREG,
-						   0xff,
-						   0x0);
+							 0xff, 0x0);
+				if (ret)
+					goto end;
 			}
 		}
 	}
@@ -323,37 +337,52 @@ static int vnt_init_registers(struct vnt_private *priv)
 	else
 		priv->short_slot_time = false;
 
-	vnt_set_short_slot_time(priv);
+	ret = vnt_set_short_slot_time(priv);
+	if (ret)
+		goto end;
 
 	priv->radio_ctl = priv->eeprom[EEP_OFS_RADIOCTL];
 
 	if ((priv->radio_ctl & EEP_RADIOCTL_ENABLE) != 0) {
-		status = vnt_control_in(priv, MESSAGE_TYPE_READ,
-					MAC_REG_GPIOCTL1,
-					MESSAGE_REQUEST_MACREG, 1, &tmp);
-
-		if (status != STATUS_SUCCESS)
-			return false;
+		ret = vnt_control_in(priv, MESSAGE_TYPE_READ,
+				     MAC_REG_GPIOCTL1, MESSAGE_REQUEST_MACREG,
+				     1, &tmp);
+		if (ret)
+			goto end;
 
-		if ((tmp & GPIO3_DATA) == 0)
-			vnt_mac_reg_bits_on(priv, MAC_REG_GPIOCTL1,
+		if ((tmp & GPIO3_DATA) == 0) {
+			ret = vnt_mac_reg_bits_on(priv, MAC_REG_GPIOCTL1,
 						  GPIO3_INTMD);
-		else
-			vnt_mac_reg_bits_off(priv, MAC_REG_GPIOCTL1,
+		} else {
+			ret = vnt_mac_reg_bits_off(priv, MAC_REG_GPIOCTL1,
 						   GPIO3_INTMD);
 		}
 
-	vnt_mac_set_led(priv, LEDSTS_TMLEN, 0x38);
+		if (ret)
+			goto end;
+	}
 
-	vnt_mac_set_led(priv, LEDSTS_STS, LEDSTS_SLOW);
 
-	vnt_mac_reg_bits_on(priv, MAC_REG_GPIOCTL0, 0x01);
+	ret = vnt_mac_set_led(priv, LEDSTS_TMLEN, 0x38);
+	if (ret)
+		goto end;
+
+	ret = vnt_mac_set_led(priv, LEDSTS_STS, LEDSTS_SLOW);
+	if (ret)
+		goto end;
 
-	vnt_radio_power_on(priv);
+	ret = vnt_mac_reg_bits_on(priv, MAC_REG_GPIOCTL0, 0x01);
+	if (ret)
+		goto end;
+
+	ret = vnt_radio_power_on(priv);
+	if (ret)
+		goto end;
 
 	dev_dbg(&priv->usb->dev, "<----INIbInitAdapter Exit\n");
 
-	return true;
+end:
+	return ret;
 }
 
 static void vnt_free_tx_bufs(struct vnt_private *priv)