rt2x00: Cleanup/optimize set_state() function callback function

* Reduce goto usage
* Mark if-statements which are true on hardware error unlikely()
* Cleanup debug messages

This makes the code look nicer and be better optimized since
the chance of hardware errors should be very small.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 29 insertions, 32 deletions

diff --git a/drivers/net/wireless/rt2x00/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index e13ed5c..4658dbd 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -1270,25 +1270,32 @@ static int rt61pci_init_registers(struct rt2x00_dev *rt2x00dev)
 	return 0;
 }
 
-static int rt61pci_init_bbp(struct rt2x00_dev *rt2x00dev)
+static int rt61pci_wait_bbp_ready(struct rt2x00_dev *rt2x00dev)
 {
 	unsigned int i;
-	u16 eeprom;
-	u8 reg_id;
 	u8 value;
 
 	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
 		rt61pci_bbp_read(rt2x00dev, 0, &value);
 		if ((value != 0xff) && (value != 0x00))
-			goto continue_csr_init;
-		NOTICE(rt2x00dev, "Waiting for BBP register.\n");
+			return 0;
 		udelay(REGISTER_BUSY_DELAY);
 	}
 
 	ERROR(rt2x00dev, "BBP register access failed, aborting.\n");
 	return -EACCES;
+}
+
+static int rt61pci_init_bbp(struct rt2x00_dev *rt2x00dev)
+{
+	unsigned int i;
+	u16 eeprom;
+	u8 reg_id;
+	u8 value;
+
+	if (unlikely(rt61pci_wait_bbp_ready(rt2x00dev)))
+		return -EACCES;
 
-continue_csr_init:
 	rt61pci_bbp_write(rt2x00dev, 3, 0x00);
 	rt61pci_bbp_write(rt2x00dev, 15, 0x30);
 	rt61pci_bbp_write(rt2x00dev, 21, 0xc8);
@@ -1337,7 +1344,8 @@ static void rt61pci_toggle_rx(struct rt2x00_dev *rt2x00dev,
 
 	rt2x00pci_register_read(rt2x00dev, TXRX_CSR0, &reg);
 	rt2x00_set_field32(&reg, TXRX_CSR0_DISABLE_RX,
-			   state == STATE_RADIO_RX_OFF);
+			   (state == STATE_RADIO_RX_OFF) ||
+			   (state == STATE_RADIO_RX_OFF_LINK));
 	rt2x00pci_register_write(rt2x00dev, TXRX_CSR0, reg);
 }
 
@@ -1389,17 +1397,10 @@ static int rt61pci_enable_radio(struct rt2x00_dev *rt2x00dev)
 	/*
 	 * Initialize all registers.
 	 */
-	if (rt61pci_init_queues(rt2x00dev) ||
-	    rt61pci_init_registers(rt2x00dev) ||
-	    rt61pci_init_bbp(rt2x00dev)) {
-		ERROR(rt2x00dev, "Register initialization failed.\n");
+	if (unlikely(rt61pci_init_queues(rt2x00dev) ||
+		     rt61pci_init_registers(rt2x00dev) ||
+		     rt61pci_init_bbp(rt2x00dev)))
 		return -EIO;
-	}
-
-	/*
-	 * Enable interrupts.
-	 */
-	rt61pci_toggle_irq(rt2x00dev, STATE_RADIO_IRQ_ON);
 
 	/*
 	 * Enable RX.
@@ -1431,11 +1432,6 @@ static void rt61pci_disable_radio(struct rt2x00_dev *rt2x00dev)
 	rt2x00_set_field32(&reg, TX_CNTL_CSR_ABORT_TX_AC2, 1);
 	rt2x00_set_field32(&reg, TX_CNTL_CSR_ABORT_TX_AC3, 1);
 	rt2x00pci_register_write(rt2x00dev, TX_CNTL_CSR, reg);
-
-	/*
-	 * Disable interrupts.
-	 */
-	rt61pci_toggle_irq(rt2x00dev, STATE_RADIO_IRQ_OFF);
 }
 
 static int rt61pci_set_state(struct rt2x00_dev *rt2x00dev, enum dev_state state)
@@ -1443,7 +1439,6 @@ static int rt61pci_set_state(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 	u32 reg;
 	unsigned int i;
 	char put_to_sleep;
-	char current_state;
 
 	put_to_sleep = (state != STATE_AWAKE);
 
@@ -1459,16 +1454,12 @@ static int rt61pci_set_state(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 	 */
 	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
 		rt2x00pci_register_read(rt2x00dev, MAC_CSR12, &reg);
-		current_state =
-		    rt2x00_get_field32(reg, MAC_CSR12_BBP_CURRENT_STATE);
-		if (current_state == !put_to_sleep)
+		state = rt2x00_get_field32(reg, MAC_CSR12_BBP_CURRENT_STATE);
+		if (state == !put_to_sleep)
 			return 0;
 		msleep(10);
 	}
 
-	NOTICE(rt2x00dev, "Device failed to enter state %d, "
-	       "current device state %d.\n", !put_to_sleep, current_state);
-
 	return -EBUSY;
 }
 
@@ -1486,11 +1477,13 @@ static int rt61pci_set_device_state(struct rt2x00_dev *rt2x00dev,
 		break;
 	case STATE_RADIO_RX_ON:
 	case STATE_RADIO_RX_ON_LINK:
-		rt61pci_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
-		break;
 	case STATE_RADIO_RX_OFF:
 	case STATE_RADIO_RX_OFF_LINK:
-		rt61pci_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
+		rt61pci_toggle_rx(rt2x00dev, state);
+		break;
+	case STATE_RADIO_IRQ_ON:
+	case STATE_RADIO_IRQ_OFF:
+		rt61pci_toggle_irq(rt2x00dev, state);
 		break;
 	case STATE_DEEP_SLEEP:
 	case STATE_SLEEP:
@@ -1503,6 +1496,10 @@ static int rt61pci_set_device_state(struct rt2x00_dev *rt2x00dev,
 		break;
 	}
 
+	if (unlikely(retval))
+		ERROR(rt2x00dev, "Device failed to enter state %d (%d).\n",
+		      state, retval);
+
 	return retval;
 }