iwlegacy: fix IBSS cleanup

We do not correctly change interface type when switching from
IBSS mode to STA mode, that results in microcode errors.

Resolves:
https://bugzilla.redhat.com/show_bug.cgi?id=886946

Reported-by: Jaroslav Skarvada <jskarvad@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 14 insertions, 21 deletions

diff --git a/drivers/net/wireless/iwlegacy/common.c b/drivers/net/wireless/iwlegacy/common.c
index 7e16d10a7f14..90b8970eadf0 100644
--- a/drivers/net/wireless/iwlegacy/common.c
+++ b/drivers/net/wireless/iwlegacy/common.c
@@ -3958,17 +3958,21 @@ il_connection_init_rx_config(struct il_priv *il)
 
         memset(&il->staging, 0, sizeof(il->staging));
 
-        if (!il->vif) {
+        switch (il->iw_mode) {
+        case NL80211_IFTYPE_UNSPECIFIED:
                 il->staging.dev_type = RXON_DEV_TYPE_ESS;
-        } else if (il->vif->type == NL80211_IFTYPE_STATION) {
+                break;
+        case NL80211_IFTYPE_STATION:
                 il->staging.dev_type = RXON_DEV_TYPE_ESS;
                 il->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
-        } else if (il->vif->type == NL80211_IFTYPE_ADHOC) {
+                break;
+        case NL80211_IFTYPE_ADHOC:
                 il->staging.dev_type = RXON_DEV_TYPE_IBSS;
                 il->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
                 il->staging.filter_flags =
                     RXON_FILTER_BCON_AWARE_MSK | RXON_FILTER_ACCEPT_GRP_MSK;
-        } else {
+                break;
+        default:
                 IL_ERR("Unsupported interface type %d\n", il->vif->type);
                 return;
         }
@@ -4550,8 +4554,7 @@ out:
 EXPORT_SYMBOL(il_mac_add_interface);
 
 static void
-il_teardown_interface(struct il_priv *il, struct ieee80211_vif *vif,
-                      bool mode_change)
+il_teardown_interface(struct il_priv *il, struct ieee80211_vif *vif)
 {
         lockdep_assert_held(&il->mutex);
 
@@ -4560,9 +4563,7 @@ il_teardown_interface(struct il_priv *il, struct ieee80211_vif *vif,
                 il_force_scan_end(il);
         }
 
-        if (!mode_change)
-                il_set_mode(il);
-
+        il_set_mode(il);
 }
 
 void
@@ -4575,8 +4576,8 @@ il_mac_remove_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 
         WARN_ON(il->vif != vif);
         il->vif = NULL;
-
-        il_teardown_interface(il, vif, false);
+        il->iw_mode = NL80211_IFTYPE_UNSPECIFIED;
+        il_teardown_interface(il, vif);
         memset(il->bssid, 0, ETH_ALEN);
 
         D_MAC80211("leave\n");
@@ -4685,18 +4686,10 @@ il_mac_change_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
         }
 
         /* success */
-        il_teardown_interface(il, vif, true);
         vif->type = newtype;
         vif->p2p = false;
-        err = il_set_mode(il);
-        WARN_ON(err);
-        /*
-         * We've switched internally, but submitting to the
-         * device may have failed for some reason. Mask this
-         * error, because otherwise mac80211 will not switch
-         * (and set the interface type back) and we'll be
-         * out of sync with it.
-         */
+        il->iw_mode = newtype;
+        il_teardown_interface(il, vif);
         err = 0;
 
 out: