rtlwifi: Switch locking from semaphores to mutexes

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rtlwifi/ps.c b/drivers/net/wireless/rtlwifi/ps.c
index fd77cd5..22c293e 100644
--- a/drivers/net/wireless/rtlwifi/ps.c
+++ b/drivers/net/wireless/rtlwifi/ps.c
@@ -287,7 +287,7 @@
 	struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
 	enum rf_pwrstate rtstate;
 
-	down(&rtlpriv->locks.ips_sem);
+	mutex_lock(&rtlpriv->locks.ips_mutex);
 
 	if (ppsc->b_inactiveps) {
 		rtstate = ppsc->rfpwr_state;
@@ -303,7 +303,7 @@
 		}
 	}
 
-	up(&rtlpriv->locks.ips_sem);
+	mutex_unlock(&rtlpriv->locks.ips_mutex);
 }
 
 /*for FW LPS*/