iwlwifi: do not nulify ctx->vif on reset

ctx->vif is dereferenced in different part of iwlwifi code, so do not
nullify it.

This should address at least one of the possible reasons of WARNING at
iwlagn_mac_remove_interface, and perhaps some random crashes when
firmware reset is performed.

Cc: stable@vger.kernel.org
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index f1226dbf789d796c7c366fe102f410eb32537f7f..2a9a16f901c3f940dd87f4865bcab51a53a7a48d 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -863,7 +863,6 @@ static void iwl_bg_run_time_calib_work(struct work_struct *work)
 
 void iwlagn_prepare_restart(struct iwl_priv *priv)
 {
-       struct iwl_rxon_context *ctx;
        bool bt_full_concurrent;
        u8 bt_ci_compliance;
        u8 bt_load;
@@ -872,8 +871,6 @@ void iwlagn_prepare_restart(struct iwl_priv *priv)
 
        lockdep_assert_held(&priv->mutex);
 
-       for_each_context(priv, ctx)
-               ctx->vif = NULL;
        priv->is_open = 0;
 
        /*

diff --git a/drivers/net/wireless/iwlwifi/iwl-mac80211.c b/drivers/net/wireless/iwlwifi/iwl-mac80211.c
index b6805f8e9a014553cca088e4992aa09c421897f7..c24a7134a6f9a3729d81350ea699246744805884 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-mac80211.c
+++ b/drivers/net/wireless/iwlwifi/iwl-mac80211.c
@@ -1244,6 +1244,7 @@ static int iwlagn_mac_add_interface(struct ieee80211_hw *hw,
        struct iwl_rxon_context *tmp, *ctx = NULL;
        int err;
        enum nl80211_iftype viftype = ieee80211_vif_type_p2p(vif);
+       bool reset = false;
 
        IWL_DEBUG_MAC80211(priv, "enter: type %d, addr %pM\n",
                           viftype, vif->addr);
@@ -1265,6 +1266,13 @@ static int iwlagn_mac_add_interface(struct ieee80211_hw *hw,
                        tmp->interface_modes | tmp->exclusive_interface_modes;
 
                if (tmp->vif) {
+                       /* On reset we need to add the same interface again */
+                       if (tmp->vif == vif) {
+                               reset = true;
+                               ctx = tmp;
+                               break;
+                       }
+
                        /* check if this busy context is exclusive */
                        if (tmp->exclusive_interface_modes &
                                                BIT(tmp->vif->type)) {
@@ -1291,7 +1299,7 @@ static int iwlagn_mac_add_interface(struct ieee80211_hw *hw,
        ctx->vif = vif;
 
        err = iwl_setup_interface(priv, ctx);
-       if (!err)
+       if (!err || reset)
                goto out;
 
        ctx->vif = NULL;