ath9k: move the PCU lock to the sc structure

The PCU lock should be used to contend TX DMA as well,
this will be done next.

This is part of a series of patches which fix stopping
TX DMA completley when requested on the driver.
For more details about this issue refer to this thread:

http://marc.info/?l=linux-wireless&m=128629803703756&w=2

Tested-by:  Ben Greear <greearb@candelatech.com>
Cc: Kyungwan Nam <kyungwan.nam@atheros.com>
Cc: stable@kernel.org
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 341d587..463ac12 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -242,7 +242,7 @@
 	ath9k_hw_disable_interrupts(ah);
 	ath_drain_all_txq(sc, false);
 
-	spin_lock_bh(&sc->rx.pcu_lock);
+	spin_lock_bh(&sc->sc_pcu_lock);
 
 	stopped = ath_stoprecv(sc);
 
@@ -268,7 +268,7 @@
 			  "Unable to reset channel (%u MHz), "
 			  "reset status %d\n",
 			  channel->center_freq, r);
-		spin_unlock_bh(&sc->rx.pcu_lock);
+		spin_unlock_bh(&sc->sc_pcu_lock);
 		goto ps_restore;
 	}
 
@@ -276,11 +276,11 @@
 		ath_print(common, ATH_DBG_FATAL,
 			  "Unable to restart recv logic\n");
 		r = -EIO;
-		spin_unlock_bh(&sc->rx.pcu_lock);
+		spin_unlock_bh(&sc->sc_pcu_lock);
 		goto ps_restore;
 	}
 
-	spin_unlock_bh(&sc->rx.pcu_lock);
+	spin_unlock_bh(&sc->sc_pcu_lock);
 
 	ath_update_txpow(sc);
 	ath9k_hw_set_interrupts(ah, ah->imask);
@@ -615,7 +615,7 @@
 		rxmask = (ATH9K_INT_RX | ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
 
 	if (status & rxmask) {
-		spin_lock_bh(&sc->rx.pcu_lock);
+		spin_lock_bh(&sc->sc_pcu_lock);
 
 		/* Check for high priority Rx first */
 		if ((ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) &&
@@ -623,7 +623,7 @@
 			ath_rx_tasklet(sc, 0, true);
 
 		ath_rx_tasklet(sc, 0, false);
-		spin_unlock_bh(&sc->rx.pcu_lock);
+		spin_unlock_bh(&sc->sc_pcu_lock);
 	}
 
 	if (status & ATH9K_INT_TX) {
@@ -881,7 +881,7 @@
 	if (!ah->curchan)
 		ah->curchan = ath_get_curchannel(sc, sc->hw);
 
-	spin_lock_bh(&sc->rx.pcu_lock);
+	spin_lock_bh(&sc->sc_pcu_lock);
 	r = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
 	if (r) {
 		ath_print(common, ATH_DBG_FATAL,
@@ -894,10 +894,10 @@
 	if (ath_startrecv(sc) != 0) {
 		ath_print(common, ATH_DBG_FATAL,
 			  "Unable to restart recv logic\n");
-		spin_unlock_bh(&sc->rx.pcu_lock);
+		spin_unlock_bh(&sc->sc_pcu_lock);
 		return;
 	}
-	spin_unlock_bh(&sc->rx.pcu_lock);
+	spin_unlock_bh(&sc->sc_pcu_lock);
 
 	if (sc->sc_flags & SC_OP_BEACONS)
 		ath_beacon_config(sc, NULL);	/* restart beacons */
@@ -937,7 +937,7 @@
 
 	ath_drain_all_txq(sc, false);	/* clear pending tx frames */
 
-	spin_lock_bh(&sc->rx.pcu_lock);
+	spin_lock_bh(&sc->sc_pcu_lock);
 
 	ath_stoprecv(sc);		/* turn off frame recv */
 	ath_flushrecv(sc);		/* flush recv queue */
@@ -955,7 +955,7 @@
 
 	ath9k_hw_phy_disable(ah);
 
-	spin_unlock_bh(&sc->rx.pcu_lock);
+	spin_unlock_bh(&sc->sc_pcu_lock);
 
 	ath9k_hw_configpcipowersave(ah, 1, 1);
 	ath9k_ps_restore(sc);
@@ -977,7 +977,7 @@
 	ath9k_hw_disable_interrupts(ah);
 	ath_drain_all_txq(sc, retry_tx);
 
-	spin_lock_bh(&sc->rx.pcu_lock);
+	spin_lock_bh(&sc->sc_pcu_lock);
 
 	ath_stoprecv(sc);
 	ath_flushrecv(sc);
@@ -991,7 +991,7 @@
 		ath_print(common, ATH_DBG_FATAL,
 			  "Unable to start recv logic\n");
 
-	spin_unlock_bh(&sc->rx.pcu_lock);
+	spin_unlock_bh(&sc->sc_pcu_lock);
 
 	/*
 	 * We may be doing a reset in response to a request
@@ -1155,14 +1155,14 @@
 	 * be followed by initialization of the appropriate bits
 	 * and then setup of the interrupt mask.
 	 */
-	spin_lock_bh(&sc->rx.pcu_lock);
+	spin_lock_bh(&sc->sc_pcu_lock);
 	r = ath9k_hw_reset(ah, init_channel, ah->caldata, false);
 	if (r) {
 		ath_print(common, ATH_DBG_FATAL,
 			  "Unable to reset hardware; reset status %d "
 			  "(freq %u MHz)\n", r,
 			  curchan->center_freq);
-		spin_unlock_bh(&sc->rx.pcu_lock);
+		spin_unlock_bh(&sc->sc_pcu_lock);
 		goto mutex_unlock;
 	}
 
@@ -1183,10 +1183,10 @@
 		ath_print(common, ATH_DBG_FATAL,
 			  "Unable to start recv logic\n");
 		r = -EIO;
-		spin_unlock_bh(&sc->rx.pcu_lock);
+		spin_unlock_bh(&sc->sc_pcu_lock);
 		goto mutex_unlock;
 	}
-	spin_unlock_bh(&sc->rx.pcu_lock);
+	spin_unlock_bh(&sc->sc_pcu_lock);
 
 	/* Setup our intr mask. */
 	ah->imask = ATH9K_INT_TX | ATH9K_INT_RXEOL |
@@ -1387,14 +1387,14 @@
 
 	if (!(sc->sc_flags & SC_OP_INVALID)) {
 		ath_drain_all_txq(sc, false);
-		spin_lock_bh(&sc->rx.pcu_lock);
+		spin_lock_bh(&sc->sc_pcu_lock);
 		ath_stoprecv(sc);
 		ath9k_hw_phy_disable(ah);
-		spin_unlock_bh(&sc->rx.pcu_lock);
+		spin_unlock_bh(&sc->sc_pcu_lock);
 	} else {
-		spin_lock_bh(&sc->rx.pcu_lock);
+		spin_lock_bh(&sc->sc_pcu_lock);
 		sc->rx.rxlink = NULL;
-		spin_unlock_bh(&sc->rx.pcu_lock);
+		spin_unlock_bh(&sc->sc_pcu_lock);
 	}
 
 	/* disable HAL and put h/w to sleep */