iwlwifi: fix locking in delayed GTK setting

This code clearly never could have worked, since it locks
while already locked. Add an unlocked __iwl_mvm_mac_set_key()
variant that doesn't do locking to fix that.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 982682e..1c904b5 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -207,11 +207,11 @@ static const struct cfg80211_pmsr_capabilities iwl_mvm_pmsr_capa = {
        },
 };
 
-static int iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
-                              enum set_key_cmd cmd,
-                              struct ieee80211_vif *vif,
-                              struct ieee80211_sta *sta,
-                              struct ieee80211_key_conf *key);
+static int __iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
+                                enum set_key_cmd cmd,
+                                struct ieee80211_vif *vif,
+                                struct ieee80211_sta *sta,
+                                struct ieee80211_key_conf *key);
 
 void iwl_mvm_ref(struct iwl_mvm *mvm, enum iwl_mvm_ref_type ref_type)
 {
@@ -2738,7 +2738,7 @@ static int iwl_mvm_start_ap_ibss(struct ieee80211_hw *hw,
 
                mvmvif->ap_early_keys[i] = NULL;
 
-               ret = iwl_mvm_mac_set_key(hw, SET_KEY, vif, NULL, key);
+               ret = __iwl_mvm_mac_set_key(hw, SET_KEY, vif, NULL, key);
                if (ret)
                        goto out_quota_failed;
        }
@@ -3506,11 +3506,11 @@ static int iwl_mvm_mac_sched_scan_stop(struct ieee80211_hw *hw,
        return ret;
 }
 
-static int iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
-                              enum set_key_cmd cmd,
-                              struct ieee80211_vif *vif,
-                              struct ieee80211_sta *sta,
-                              struct ieee80211_key_conf *key)
+static int __iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
+                                enum set_key_cmd cmd,
+                                struct ieee80211_vif *vif,
+                                struct ieee80211_sta *sta,
+                                struct ieee80211_key_conf *key)
 {
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
@@ -3565,8 +3565,6 @@ static int iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
                        return -EOPNOTSUPP;
        }
 
-       mutex_lock(&mvm->mutex);
-
        switch (cmd) {
        case SET_KEY:
                if ((vif->type == NL80211_IFTYPE_ADHOC ||
@@ -3712,7 +3710,22 @@ static int iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
                ret = -EINVAL;
        }
 
+       return ret;
+}
+
+static int iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
+                              enum set_key_cmd cmd,
+                              struct ieee80211_vif *vif,
+                              struct ieee80211_sta *sta,
+                              struct ieee80211_key_conf *key)
+{
+       struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
+       int ret;
+
+       mutex_lock(&mvm->mutex);
+       ret = __iwl_mvm_mac_set_key(hw, cmd, vif, sta, key);
        mutex_unlock(&mvm->mutex);
+
        return ret;
 }