atheros: define a common priv struct

hw code should never use private driver data, but
sometimes we need a backpointer so just stuff it on
the common ath struct.

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/pci.c b/drivers/net/wireless/ath/ath9k/pci.c
index b2a45ce..63059b6 100644
--- a/drivers/net/wireless/ath/ath9k/pci.c
+++ b/drivers/net/wireless/ath/ath9k/pci.c
@@ -33,8 +33,7 @@
 /* return bus cachesize in 4B word units */
 static void ath_pci_read_cachesize(struct ath_common *common, int *csz)
 {
-	struct ath_hw *ah = (struct ath_hw *) common->ah;
-	struct ath_softc *sc = ah->ah_sc;
+	struct ath_softc *sc = (struct ath_softc *) common->priv;
 	u8 u8tmp;
 
 	pci_read_config_byte(to_pci_dev(sc->dev), PCI_CACHE_LINE_SIZE, &u8tmp);
@@ -52,8 +51,7 @@
 
 static void ath_pci_cleanup(struct ath_common *common)
 {
-	struct ath_hw *ah = (struct ath_hw *) common->ah;
-	struct ath_softc *sc = ah->ah_sc;
+	struct ath_softc *sc = (struct ath_softc *) common->priv;
 	struct pci_dev *pdev = to_pci_dev(sc->dev);
 
 	pci_iounmap(pdev, sc->mem);
@@ -86,8 +84,7 @@
  */
 static void ath_pci_bt_coex_prep(struct ath_common *common)
 {
-	struct ath_hw *ah = (struct ath_hw *) common->ah;
-	struct ath_softc *sc = ah->ah_sc;
+	struct ath_softc *sc = (struct ath_softc *) common->priv;
 	struct pci_dev *pdev = to_pci_dev(sc->dev);
 	u8 aspm;