iwlwifi: take a valid antenna upon rate scale init

This patch selects a valid antennae upon rate scale init. This solves a
SYSASSERT complaining that the driver is setting a non valid antenna in
the LQ CMD.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.h b/drivers/net/wireless/iwlwifi/iwl-agn-rs.h
index d148d73635eb..bac91f1d2aa8 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.h
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.h
@@ -284,6 +284,16 @@ static inline u8 num_of_ant(u8 mask)
                 !!((mask) & ANT_C);
 }
 
+static inline u8 first_antenna(u8 mask)
+{
+        if (mask & ANT_A)
+                return ANT_A;
+        if (mask & ANT_B)
+                return ANT_B;
+        return ANT_C;
+}
+
+
 static inline u8 iwl4965_get_prev_ieee_rate(u8 rate_index)
 {
         u8 rate = iwl_rates[rate_index].prev_ieee;