b43: Only select allowed TX and RX antennas

[mv-sheeva.git] / drivers / net / wireless / b43 / main.c

diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index 68bbe8eafd6db8e4f896b69aab2588e1bcfeb9bd..f4c14272332bbe982232a7edeef3324b033200ca 100644 (file)
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -2692,8 +2692,36 @@ static int b43_switch_phymode(struct b43_wl *wl, unsigned int new_mode)
        return err;
 }
 
-static int b43_antenna_from_ieee80211(u8 antenna)
+/* Check if the use of the antenna that ieee80211 told us to
+ * use is possible. This will fall back to DEFAULT.
+ * "antenna_nr" is the antenna identifier we got from ieee80211. */
+u8 b43_ieee80211_antenna_sanitize(struct b43_wldev *dev,
+                                 u8 antenna_nr)
 {
+       u8 antenna_mask;
+
+       if (antenna_nr == 0) {
+               /* Zero means "use default antenna". That's always OK. */
+               return 0;
+       }
+
+       /* Get the mask of available antennas. */
+       if (dev->phy.gmode)
+               antenna_mask = dev->dev->bus->sprom.ant_available_bg;
+       else
+               antenna_mask = dev->dev->bus->sprom.ant_available_a;
+
+       if (!(antenna_mask & (1 << (antenna_nr - 1)))) {
+               /* This antenna is not available. Fall back to default. */
+               return 0;
+       }
+
+       return antenna_nr;
+}
+
+static int b43_antenna_from_ieee80211(struct b43_wldev *dev, u8 antenna)
+{
+       antenna = b43_ieee80211_antenna_sanitize(dev, antenna);
        switch (antenna) {
        case 0:         /* default/diversity */
                return B43_ANTENNA_DEFAULT;
@@ -2713,14 +2741,10 @@ static int b43_op_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
        struct b43_phy *phy;
        unsigned long flags;
        unsigned int new_phymode = 0xFFFF;
-       int antenna_tx;
-       int antenna_rx;
+       int antenna;
        int err = 0;
        u32 savedirqs;
 
-       antenna_tx = b43_antenna_from_ieee80211(conf->antenna_sel_tx);
-       antenna_rx = b43_antenna_from_ieee80211(conf->antenna_sel_rx);
-
        mutex_lock(&wl->mutex);
 
        /* Switch the PHY mode (if necessary). */
@@ -2781,8 +2805,10 @@ static int b43_op_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
        }
 
        /* Antennas for RX and management frame TX. */
-       b43_mgmtframe_txantenna(dev, antenna_tx);
-       b43_set_rx_antenna(dev, antenna_rx);
+       antenna = b43_antenna_from_ieee80211(dev, conf->antenna_sel_tx);
+       b43_mgmtframe_txantenna(dev, antenna);
+       antenna = b43_antenna_from_ieee80211(dev, conf->antenna_sel_rx);
+       b43_set_rx_antenna(dev, antenna);
 
        /* Update templates for AP mode. */
        if (b43_is_mode(wl, IEEE80211_IF_TYPE_AP))