rtl8192e: Replace semaphore rf_sem with mutex

The semaphore 'rf_sem' in the rtl8192e is a simple mutex, so it should
be written as one. Semaphores are going away in the future.
Signed-off-by: Binoy Jayan <binoy.jayan@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192e/rtl8192e/r8192E_phy.c

@@ -256,7 +256,7 @@ u32 rtl92e_get_rf_reg(struct net_device *dev, enum rf90_radio_path eRFPath,
 		return 0;
 	if (priv->rtllib->eRFPowerState != eRfOn && !priv->being_init_adapter)
 		return	0;
-	down(&priv->rf_sem);
+	mutex_lock(&priv->rf_mutex);
 	if (priv->Rf_Mode == RF_OP_By_FW) {
 		Original_Value = _rtl92e_phy_rf_fw_read(dev, eRFPath, RegAddr);
 		udelay(200);
@@ -265,7 +265,7 @@ u32 rtl92e_get_rf_reg(struct net_device *dev, enum rf90_radio_path eRFPath,
 	}
 	BitShift =  _rtl92e_calculate_bit_shift(BitMask);
 	Readback_Value = (Original_Value & BitMask) >> BitShift;
-	up(&priv->rf_sem);
+	mutex_unlock(&priv->rf_mutex);
 	return Readback_Value;
 }
 

drivers/staging/rtl8192e/rtl8192e/rtl_core.c

@@ -994,7 +994,7 @@ static void _rtl92e_init_priv_lock(struct r8192_priv *priv)
 	spin_lock_init(&priv->rf_ps_lock);
 	spin_lock_init(&priv->ps_lock);
 	mutex_init(&priv->wx_mutex);
-	sema_init(&priv->rf_sem, 1);
+	mutex_init(&priv->rf_mutex);
 	mutex_init(&priv->mutex);
 }
 

drivers/staging/rtl8192e/rtl8192e/rtl_core.h

@@ -376,7 +376,7 @@ struct r8192_priv {
 	struct tasklet_struct		irq_prepare_beacon_tasklet;
 
 	struct mutex				wx_mutex;
-	struct semaphore			rf_sem;
+	struct mutex				rf_mutex;
 	struct mutex				mutex;
 
 	struct rt_stats stats;