ath9k: enable 2GHz band only if the device supports it

Currently, the 2GHz band is enabled unconditionally, even if the device
does not support it.

Changes-licensed-under: ISC
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 13 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 493160c8c75..2ec61f08cfd 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -976,7 +976,10 @@ int ath9k_hw_init(struct ath_hw *ah)
                 return r;
 
         ath9k_hw_init_mode_gain_regs(ah);
-        ath9k_hw_fill_cap_info(ah);
+        r = ath9k_hw_fill_cap_info(ah);
+        if (r)
+                return r;
+
         ath9k_hw_init_11a_eeprom_fix(ah);
 
         r = ath9k_hw_init_macaddr(ah);
@@ -3112,7 +3115,7 @@ EXPORT_SYMBOL(ath9k_hw_set_sta_beacon_timers);
 /* HW Capabilities */
 /*******************/
 
-void ath9k_hw_fill_cap_info(struct ath_hw *ah)
+int ath9k_hw_fill_cap_info(struct ath_hw *ah)
 {
         struct ath9k_hw_capabilities *pCap = &ah->caps;
         struct ath_regulatory *regulatory = ath9k_hw_regulatory(ah);
@@ -3143,6 +3146,12 @@ void ath9k_hw_fill_cap_info(struct ath_hw *ah)
         }
 
         eeval = ah->eep_ops->get_eeprom(ah, EEP_OP_MODE);
+        if ((eeval & (AR5416_OPFLAGS_11G | AR5416_OPFLAGS_11A)) == 0) {
+                ath_print(common, ATH_DBG_FATAL,
+                          "no band has been marked as supported in EEPROM.\n");
+                return -EINVAL;
+        }
+
         bitmap_zero(pCap->wireless_modes, ATH9K_MODE_MAX);
 
         if (eeval & AR5416_OPFLAGS_11A) {
@@ -3306,6 +3315,8 @@ void ath9k_hw_fill_cap_info(struct ath_hw *ah)
         } else {
                 btcoex_hw->scheme = ATH_BTCOEX_CFG_NONE;
         }
+
+        return 0;
 }
 
 bool ath9k_hw_getcapability(struct ath_hw *ah, enum ath9k_capability_type type,