b43: Only select allowed TX and RX antennas

This fixes antenna selection in b43. It adds a sanity check
for the antenna numbers we get from mac80211.

This patch depends on
ssb: Fix extraction of values from SPROM

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43/xmit.c b/drivers/net/wireless/b43/xmit.c
index e60e54d..3d31276 100644
--- a/drivers/net/wireless/b43/xmit.c
+++ b/drivers/net/wireless/b43/xmit.c
@@ -270,14 +270,15 @@
 		phy_ctl |= B43_TX4_PHY_OFDM;
 	if (dev->short_preamble)
 		phy_ctl |= B43_TX4_PHY_SHORTPRMBL;
-	switch (txctl->antenna_sel_tx) {
-	case 0:
+
+	switch (b43_ieee80211_antenna_sanitize(dev, txctl->antenna_sel_tx)) {
+	case 0: /* Default */
 		phy_ctl |= B43_TX4_PHY_ANTLAST;
 		break;
-	case 1:
+	case 1: /* Antenna 0 */
 		phy_ctl |= B43_TX4_PHY_ANT0;
 		break;
-	case 2:
+	case 2: /* Antenna 1 */
 		phy_ctl |= B43_TX4_PHY_ANT1;
 		break;
 	default: