Date:   Sun, 3 Dec 2017 01:09:49 +0100
From:   Nguyen Phan Quang Minh <minhnpq16@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        devel@...verdev.osuosl.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCHv2] staging: pi433: pi433_if.c remove SET_CHECKED macro

The macro calls its argument -a function- twice, makes the calling
function return prematurely -skipping resource cleanup code- and hurts
understandability.

Signed-off-by: Nguyen Phan Quang Minh <minhnpq16@...il.com>
---
Base on Dan's feedback, I checked and the macro return indeed skips over
some cleanup code, hence remove it.
The code is not pretty, any hints on how to do it better is greatly
appreciated.

 drivers/staging/pi433/pi433_if.c | 237 ++++++++++++++++++++++++++++-----------
 1 file changed, 174 insertions(+), 63 deletions(-)

diff --git a/drivers/staging/pi433/pi433_if.c b/drivers/staging/pi433/pi433_if.c
index 3404cb9722c9..c41243f74363 100644
--- a/drivers/staging/pi433/pi433_if.c
+++ b/drivers/staging/pi433/pi433_if.c
@@ -119,12 +119,6 @@ struct pi433_instance {
 	struct pi433_tx_cfg	tx_cfg;
 };
 
-/*-------------------------------------------------------------------------*/
-
-/* macro for checked access of registers of radio module */
-#define SET_CHECKED(retval) \
-	if (retval < 0) \
-		return retval;
 
 /*-------------------------------------------------------------------------*/
 
@@ -183,28 +177,53 @@ rf69_set_rx_cfg(struct pi433_device *dev, struct pi433_rx_cfg *rx_cfg)
 	int payload_length;
 
 	/* receiver config */
-	SET_CHECKED(rf69_set_frequency	(dev->spi, rx_cfg->frequency));
-	SET_CHECKED(rf69_set_bit_rate	(dev->spi, rx_cfg->bit_rate));
-	SET_CHECKED(rf69_set_modulation	(dev->spi, rx_cfg->modulation));
-	SET_CHECKED(rf69_set_antenna_impedance	 (dev->spi, rx_cfg->antenna_impedance));
-	SET_CHECKED(rf69_set_rssi_threshold	 (dev->spi, rx_cfg->rssi_threshold));
-	SET_CHECKED(rf69_set_ook_threshold_dec	 (dev->spi, rx_cfg->thresholdDecrement));
-	SET_CHECKED(rf69_set_bandwidth 		 (dev->spi, rx_cfg->bw_mantisse, rx_cfg->bw_exponent));
-	SET_CHECKED(rf69_set_bandwidth_during_afc(dev->spi, rx_cfg->bw_mantisse, rx_cfg->bw_exponent));
-	SET_CHECKED(rf69_set_dagc 		 (dev->spi, rx_cfg->dagc));
+	ret = rf69_set_frequency(dev->spi, rx_cfg->frequency);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_bit_rate(dev->spi, rx_cfg->bit_rate);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_modulation(dev->spi, rx_cfg->modulation);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_antenna_impedance(dev->spi, rx_cfg->antenna_impedance);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_rssi_threshold(dev->spi, rx_cfg->rssi_threshold);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_ook_threshold_dec(dev->spi, rx_cfg->thresholdDecrement);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_bandwidth(dev->spi, rx_cfg->bw_mantisse, rx_cfg->bw_exponent);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_bandwidth_during_afc(dev->spi, rx_cfg->bw_mantisse,
+					    rx_cfg->bw_exponent);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_dagc(dev->spi, rx_cfg->dagc);
+	if (ret < 0)
+		return ret;
 
 	dev->rx_bytes_to_drop = rx_cfg->bytes_to_drop;
 
 	/* packet config */
 	/* enable */
-	SET_CHECKED(rf69_set_sync_enable(dev->spi, rx_cfg->enable_sync));
+	ret = rf69_set_sync_enable(dev->spi, rx_cfg->enable_sync);
+	if (ret < 0)
+		return ret;
 	if (rx_cfg->enable_sync == optionOn)
 	{
-		SET_CHECKED(rf69_set_fifo_fill_condition(dev->spi, afterSyncInterrupt));
+		ret = rf69_set_fifo_fill_condition(dev->spi, afterSyncInterrupt);
+		if (ret < 0)
+			return ret;
 	}
 	else
 	{
-		SET_CHECKED(rf69_set_fifo_fill_condition(dev->spi, always));
+		ret = rf69_set_fifo_fill_condition(dev->spi, always);
+		if (ret < 0)
+			return ret;
 	}
 	if (rx_cfg->enable_length_byte == optionOn) {
 		ret = rf69_set_packet_format(dev->spi, packetLengthVar);
@@ -215,36 +234,54 @@ rf69_set_rx_cfg(struct pi433_device *dev, struct pi433_rx_cfg *rx_cfg)
 		if (ret < 0)
 			return ret;
 	}
-	SET_CHECKED(rf69_set_adressFiltering(dev->spi, rx_cfg->enable_address_filtering));
-	SET_CHECKED(rf69_set_crc_enable	    (dev->spi, rx_cfg->enable_crc));
+	ret = rf69_set_adressFiltering(dev->spi, rx_cfg->enable_address_filtering);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_crc_enable(dev->spi, rx_cfg->enable_crc);
+	if (ret < 0)
+		return ret;
 
 	/* lengths */
-	SET_CHECKED(rf69_set_sync_size(dev->spi, rx_cfg->sync_length));
+	ret = rf69_set_sync_size(dev->spi, rx_cfg->sync_length);
+	if (ret < 0)
+		return ret;
 	if (rx_cfg->enable_length_byte == optionOn)
 	{
-		SET_CHECKED(rf69_set_payload_length(dev->spi, 0xff));
+		ret = rf69_set_payload_length(dev->spi, 0xff);
+		if (ret < 0)
+			return ret;
 	}
 	else if (rx_cfg->fixed_message_length != 0)
 	{
 		payload_length = rx_cfg->fixed_message_length;
 		if (rx_cfg->enable_length_byte  == optionOn) payload_length++;
 		if (rx_cfg->enable_address_filtering != filteringOff) payload_length++;
-		SET_CHECKED(rf69_set_payload_length(dev->spi, payload_length));
+		ret = rf69_set_payload_length(dev->spi, payload_length);
+		if (ret < 0)
+			return ret;
 	}
 	else
 	{
-		SET_CHECKED(rf69_set_payload_length(dev->spi, 0));
+		ret = rf69_set_payload_length(dev->spi, 0);
+		if (ret < 0)
+			return ret;
 	}
 
 	/* values */
 	if (rx_cfg->enable_sync == optionOn)
 	{
-		SET_CHECKED(rf69_set_sync_values(dev->spi, rx_cfg->sync_pattern));
+		ret = rf69_set_sync_values(dev->spi, rx_cfg->sync_pattern);
+		if (ret < 0)
+			return ret;
 	}
 	if (rx_cfg->enable_address_filtering != filteringOff)
 	{
-		SET_CHECKED(rf69_set_node_address     (dev->spi, rx_cfg->node_address));
-		SET_CHECKED(rf69_set_broadcast_address(dev->spi, rx_cfg->broadcast_address));
+		ret = rf69_set_node_address(dev->spi, rx_cfg->node_address);
+		if (ret < 0)
+			return ret;
+		ret = rf69_set_broadcast_address(dev->spi, rx_cfg->broadcast_address);
+		if (ret < 0)
+			return ret;
 	}
 
 	return 0;
@@ -255,24 +292,44 @@ rf69_set_tx_cfg(struct pi433_device *dev, struct pi433_tx_cfg *tx_cfg)
 {
 	int ret;
 
-	SET_CHECKED(rf69_set_frequency	(dev->spi, tx_cfg->frequency));
-	SET_CHECKED(rf69_set_bit_rate	(dev->spi, tx_cfg->bit_rate));
-	SET_CHECKED(rf69_set_modulation	(dev->spi, tx_cfg->modulation));
-	SET_CHECKED(rf69_set_deviation	(dev->spi, tx_cfg->dev_frequency));
-	SET_CHECKED(rf69_set_pa_ramp	(dev->spi, tx_cfg->pa_ramp));
-	SET_CHECKED(rf69_set_modulation_shaping(dev->spi, tx_cfg->modShaping));
-	SET_CHECKED(rf69_set_tx_start_condition(dev->spi, tx_cfg->tx_start_condition));
+	ret = rf69_set_frequency(dev->spi, tx_cfg->frequency);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_bit_rate(dev->spi, tx_cfg->bit_rate);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_modulation(dev->spi, tx_cfg->modulation);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_deviation(dev->spi, tx_cfg->dev_frequency);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_pa_ramp(dev->spi, tx_cfg->pa_ramp);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_modulation_shaping(dev->spi, tx_cfg->modShaping);
+	if (ret < 0)
+		return ret;
+	ret = rf69_set_tx_start_condition(dev->spi, tx_cfg->tx_start_condition);
+	if (ret < 0)
+		return ret;
 
 	/* packet format enable */
 	if (tx_cfg->enable_preamble == optionOn)
 	{
-		SET_CHECKED(rf69_set_preamble_length(dev->spi, tx_cfg->preamble_length));
+		ret = rf69_set_preamble_length(dev->spi, tx_cfg->preamble_length);
+		if (ret < 0)
+			return ret;
 	}
 	else
 	{
-		SET_CHECKED(rf69_set_preamble_length(dev->spi, 0));
+		ret = rf69_set_preamble_length(dev->spi, 0);
+		if (ret < 0)
+			return ret;
 	}
-	SET_CHECKED(rf69_set_sync_enable  (dev->spi, tx_cfg->enable_sync));
+	ret = rf69_set_sync_enable (dev->spi, tx_cfg->enable_sync);
+	if (ret < 0)
+		return ret;
 	if (tx_cfg->enable_length_byte == optionOn) {
 		ret = rf69_set_packet_format(dev->spi, packetLengthVar);
 		if (ret < 0)
@@ -282,12 +339,18 @@ rf69_set_tx_cfg(struct pi433_device *dev, struct pi433_tx_cfg *tx_cfg)
 		if (ret < 0)
 			return ret;
 	}
-	SET_CHECKED(rf69_set_crc_enable	  (dev->spi, tx_cfg->enable_crc));
+	ret = rf69_set_crc_enable(dev->spi, tx_cfg->enable_crc);
+	if (ret < 0)
+		return ret;
 
 	/* configure sync, if enabled */
 	if (tx_cfg->enable_sync == optionOn) {
-		SET_CHECKED(rf69_set_sync_size(dev->spi, tx_cfg->sync_length));
-		SET_CHECKED(rf69_set_sync_values(dev->spi, tx_cfg->sync_pattern));
+		ret = rf69_set_sync_size(dev->spi, tx_cfg->sync_length);
+		if (ret < 0)
+			return ret;
+		ret = rf69_set_sync_values(dev->spi, tx_cfg->sync_pattern);
+		if (ret < 0)
+			return ret;
 	}
 
 	return 0;
@@ -309,18 +372,26 @@ pi433_start_rx(struct pi433_device *dev)
 	if (retval) return retval;
 
 	/* setup rssi irq */
-	SET_CHECKED(rf69_set_dio_mapping(dev->spi, DIO0, DIO_Rssi_DIO0));
+	retval = rf69_set_dio_mapping(dev->spi, DIO0, DIO_Rssi_DIO0);
+	if (retval < 0)
+		return retval;
 	dev->irq_state[DIO0] = DIO_Rssi_DIO0;
 	irq_set_irq_type(dev->irq_num[DIO0], IRQ_TYPE_EDGE_RISING);
 
 	/* setup fifo level interrupt */
-	SET_CHECKED(rf69_set_fifo_threshold(dev->spi, FIFO_SIZE - FIFO_THRESHOLD));
-	SET_CHECKED(rf69_set_dio_mapping(dev->spi, DIO1, DIO_FifoLevel));
+	retval = rf69_set_fifo_threshold(dev->spi, FIFO_SIZE - FIFO_THRESHOLD);
+	if (retval < 0)
+		return retval;
+	retval = rf69_set_dio_mapping(dev->spi, DIO1, DIO_FifoLevel);
+	if (retval < 0)
+		return retval;
 	dev->irq_state[DIO1] = DIO_FifoLevel;
 	irq_set_irq_type(dev->irq_num[DIO1], IRQ_TYPE_EDGE_RISING);
 
 	/* set module to receiving mode */
-	SET_CHECKED(rf69_set_mode(dev->spi, receive));
+	retval = rf69_set_mode(dev->spi, receive);
+	if (retval < 0)
+		return retval;
 
 	return 0;
 }
@@ -335,6 +406,7 @@ pi433_receive(void *data)
 	struct spi_device *spi = dev->spi; /* needed for SET_CHECKED */
 	int bytes_to_read, bytes_total;
 	int retval;
+	int ret;
 
 	dev->interrupt_rx_allowed = false;
 
@@ -378,7 +450,9 @@ pi433_receive(void *data)
 	}
 
 	/* configure payload ready irq */
-	SET_CHECKED(rf69_set_dio_mapping(spi, DIO0, DIO_PayloadReady));
+	retval = rf69_set_dio_mapping(spi, DIO0, DIO_PayloadReady);
+	if (retval < 0)
+		goto abort;
 	dev->irq_state[DIO0] = DIO_PayloadReady;
 	irq_set_irq_type(dev->irq_num[DIO0], IRQ_TYPE_EDGE_RISING);
 
@@ -468,7 +542,9 @@ pi433_receive(void *data)
 	/* rx done, wait was interrupted or error occurred */
 abort:
 	dev->interrupt_rx_allowed = true;
-	SET_CHECKED(rf69_set_mode(dev->spi, standby));
+	ret = rf69_set_mode(dev->spi, standby);
+	if (ret < 0)
+		return ret;
 	wake_up_interruptible(&dev->tx_wait_queue);
 
 	if (retval)
@@ -570,38 +646,56 @@ pi433_tx_thread(void *data)
 			/* rx is currently waiting for a telegram;
 			 * we need to set the radio module to standby
 			 */
-			SET_CHECKED(rf69_set_mode(device->spi, standby));
+			retval = rf69_set_mode(device->spi, standby);
+			if (retval < 0)
+				return retval;
 			rx_interrupted = true;
 		}
 
 		/* clear fifo, set fifo threshold, set payload length */
-		SET_CHECKED(rf69_set_mode(spi, standby)); /* this clears the fifo */
-		SET_CHECKED(rf69_set_fifo_threshold(spi, FIFO_THRESHOLD));
+		retval = rf69_set_mode(spi, standby); /* this clears the fifo */
+		if (retval < 0)
+			return retval;
+		retval = rf69_set_fifo_threshold(spi, FIFO_THRESHOLD);
+		if (retval < 0)
+			return retval;
 		if (tx_cfg.enable_length_byte == optionOn)
 		{
-			SET_CHECKED(rf69_set_payload_length(spi, size * tx_cfg.repetitions));
+			retval = rf69_set_payload_length(spi, size * tx_cfg.repetitions);
+			if (retval < 0)
+				return retval;
 		}
 		else
 		{
-			SET_CHECKED(rf69_set_payload_length(spi, 0));
+			retval = rf69_set_payload_length(spi, 0);
+			if (retval < 0)
+				return retval;
 		}
 
 		/* configure the rf chip */
-		rf69_set_tx_cfg(device, &tx_cfg);
+		retval = rf69_set_tx_cfg(device, &tx_cfg);
+		if (retval < 0)
+			return retval;
 
 		/* enable fifo level interrupt */
-		SET_CHECKED(rf69_set_dio_mapping(spi, DIO1, DIO_FifoLevel));
+		retval = rf69_set_dio_mapping(spi, DIO1, DIO_FifoLevel);
+		if (retval < 0)
+			return retval;
 		device->irq_state[DIO1] = DIO_FifoLevel;
 		irq_set_irq_type(device->irq_num[DIO1], IRQ_TYPE_EDGE_FALLING);
 
 		/* enable packet sent interrupt */
-		SET_CHECKED(rf69_set_dio_mapping(spi, DIO0, DIO_PacketSent));
+		retval = rf69_set_dio_mapping(spi, DIO0, DIO_PacketSent);
+		if (retval < 0)
+			return retval;
 		device->irq_state[DIO0] = DIO_PacketSent;
 		irq_set_irq_type(device->irq_num[DIO0], IRQ_TYPE_EDGE_RISING);
 		enable_irq(device->irq_num[DIO0]); /* was disabled by rx active check */
 
 		/* enable transmission */
-		SET_CHECKED(rf69_set_mode(spi, transmit));
+		retval = rf69_set_mode(spi, transmit);
+		if (retval < 0)
+			return retval;
 
 		/* transfer this msg (and repetitions) to chip fifo */
 		device->free_in_fifo = FIFO_SIZE;
@@ -643,7 +737,9 @@ pi433_tx_thread(void *data)
 
 		/* STOP_TRANSMISSION */
 		dev_dbg(device->dev, "thread: Packet sent. Set mode to stby.");
-		SET_CHECKED(rf69_set_mode(spi, standby));
+		retval = rf69_set_mode(spi, standby);
+		if (retval < 0)
+			return retval;
 
 		/* everything sent? */
 		if (kfifo_is_empty(&device->tx_fifo)) {
@@ -1089,13 +1185,27 @@ static int pi433_probe(struct spi_device *spi)
 	}
 
 	/* setup the radio module */
-	SET_CHECKED(rf69_set_mode		(spi, standby));
-	SET_CHECKED(rf69_set_data_mode		(spi, packet));
-	SET_CHECKED(rf69_set_amplifier_0	(spi, optionOn));
-	SET_CHECKED(rf69_set_amplifier_1	(spi, optionOff));
-	SET_CHECKED(rf69_set_amplifier_2	(spi, optionOff));
-	SET_CHECKED(rf69_set_output_power_level	(spi, 13));
-	SET_CHECKED(rf69_set_antenna_impedance	(spi, fiftyOhm));
+	retval = rf69_set_mode(spi, standby);
+	if (retval < 0)
+		goto radio_failed;
+	retval = rf69_set_data_mode(spi, packet);
+	if (retval < 0)
+		goto radio_failed;
+	retval = rf69_set_amplifier_0(spi, optionOn);
+	if (retval < 0)
+		goto radio_failed;
+	retval = rf69_set_amplifier_1(spi, optionOff);
+	if (retval < 0)
+		goto radio_failed;
+	retval = rf69_set_amplifier_2(spi, optionOff);
+	if (retval < 0)
+		goto radio_failed;
+	retval = rf69_set_output_power_level(spi, 13);
+	if (retval < 0)
+		goto radio_failed;
+	retval = rf69_set_antenna_impedance(spi, fiftyOhm);
+	if (retval < 0)
+		goto radio_failed;
 
 	/* determ minor number */
 	retval = pi433_get_minor(device);
@@ -1156,6 +1266,7 @@ static int pi433_probe(struct spi_device *spi)
 device_create_failed:
 	pi433_free_minor(device);
 minor_failed:
+radio_failed:
 	free_GPIOs(device);
 GPIO_failed:
 	kfree(device);
-- 
2.15.1

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