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, 28 insertions, 21 deletions

diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index 26c2e0a1a308..aabdc67c8555 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -1084,25 +1084,32 @@ static int rt73usb_init_registers(struct rt2x00_dev *rt2x00dev)
         return 0;
 }
 
-static int rt73usb_init_bbp(struct rt2x00_dev *rt2x00dev)
+static int rt73usb_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++) {
                 rt73usb_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 rt73usb_init_bbp(struct rt2x00_dev *rt2x00dev)
+{
+        unsigned int i;
+        u16 eeprom;
+        u8 reg_id;
+        u8 value;
+
+        if (unlikely(rt73usb_wait_bbp_ready(rt2x00dev)))
+                return -EACCES;
 
-continue_csr_init:
         rt73usb_bbp_write(rt2x00dev, 3, 0x80);
         rt73usb_bbp_write(rt2x00dev, 15, 0x30);
         rt73usb_bbp_write(rt2x00dev, 21, 0xc8);
@@ -1152,7 +1159,8 @@ static void rt73usb_toggle_rx(struct rt2x00_dev *rt2x00dev,
 
         rt73usb_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));
         rt73usb_register_write(rt2x00dev, TXRX_CSR0, reg);
 }
 
@@ -1161,11 +1169,9 @@ static int rt73usb_enable_radio(struct rt2x00_dev *rt2x00dev)
         /*
          * Initialize all registers.
          */
-        if (rt73usb_init_registers(rt2x00dev) ||
-            rt73usb_init_bbp(rt2x00dev)) {
-                ERROR(rt2x00dev, "Register initialization failed.\n");
+        if (unlikely(rt73usb_init_registers(rt2x00dev) ||
+                     rt73usb_init_bbp(rt2x00dev)))
                 return -EIO;
-        }
 
         return 0;
 }
@@ -1187,7 +1193,6 @@ static int rt73usb_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);
 
@@ -1203,16 +1208,12 @@ static int rt73usb_set_state(struct rt2x00_dev *rt2x00dev, enum dev_state state)
          */
         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
                 rt73usb_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;
 }
 
@@ -1230,11 +1231,13 @@ static int rt73usb_set_device_state(struct rt2x00_dev *rt2x00dev,
                 break;
         case STATE_RADIO_RX_ON:
         case STATE_RADIO_RX_ON_LINK:
-                rt73usb_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
-                break;
         case STATE_RADIO_RX_OFF:
         case STATE_RADIO_RX_OFF_LINK:
-                rt73usb_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
+                rt73usb_toggle_rx(rt2x00dev, state);
+                break;
+        case STATE_RADIO_IRQ_ON:
+        case STATE_RADIO_IRQ_OFF:
+                /* No support, but no error either */
                 break;
         case STATE_DEEP_SLEEP:
         case STATE_SLEEP:
@@ -1247,6 +1250,10 @@ static int rt73usb_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;
 }