wl1251: fix null data for IBSS

Fix the WARN below by not calling ieee80211_nullfunc_get() in IBSS mode,
but setting up empty template the same way wl12xx driver does.

WARNING: CPU: 0 PID: 914 at net/mac80211/tx.c:2750 ieee80211_nullfunc_get+0xc0/0xd0 [mac80211]()
Modules linked in: wl1251_sdio wl1251 mac80211 cfg80211
...
[<c00439c0>] (warn_slowpath_null)
[<bf0bdfdc>] (ieee80211_nullfunc_get [mac80211])
[<bf134774>] (wl1251_op_bss_info_changed [wl1251])
[<bf099e14>] (ieee80211_bss_info_change_notify [mac80211])
...

Also perform join command regardless of bss_type as that seems to be
required for proper operation.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Tested-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ti/wl1251/main.c b/drivers/net/wireless/ti/wl1251/main.c
index c22e225..f557eb5 100644 (file)
--- a/drivers/net/wireless/ti/wl1251/main.c
+++ b/drivers/net/wireless/ti/wl1251/main.c
@@ -550,6 +550,34 @@ static void wl1251_op_remove_interface(struct ieee80211_hw *hw,
        mutex_unlock(&wl->mutex);
 }
 
+static int wl1251_build_null_data(struct wl1251 *wl)
+{
+       struct sk_buff *skb = NULL;
+       int size;
+       void *ptr;
+       int ret = -ENOMEM;
+
+       if (wl->bss_type == BSS_TYPE_IBSS) {
+               size = sizeof(struct wl12xx_null_data_template);
+               ptr = NULL;
+       } else {
+               skb = ieee80211_nullfunc_get(wl->hw, wl->vif);
+               if (!skb)
+                       goto out;
+               size = skb->len;
+               ptr = skb->data;
+       }
+
+       ret = wl1251_cmd_template_set(wl, CMD_NULL_DATA, ptr, size);
+
+out:
+       dev_kfree_skb(skb);
+       if (ret)
+               wl1251_warning("cmd buld null data failed: %d", ret);
+
+       return ret;
+}
+
 static int wl1251_build_qos_null_data(struct wl1251 *wl)
 {
        struct ieee80211_qos_hdr template;
@@ -1093,24 +1121,19 @@ static void wl1251_op_bss_info_changed(struct ieee80211_hw *hw,
                wl->rssi_thold = bss_conf->cqm_rssi_thold;
        }
 
-       if (changed & BSS_CHANGED_BSSID) {
+       if ((changed & BSS_CHANGED_BSSID) &&
+           memcmp(wl->bssid, bss_conf->bssid, ETH_ALEN)) {
                memcpy(wl->bssid, bss_conf->bssid, ETH_ALEN);
 
-               skb = ieee80211_nullfunc_get(wl->hw, wl->vif);
-               if (!skb)
-                       goto out_sleep;
-
-               ret = wl1251_cmd_template_set(wl, CMD_NULL_DATA,
-                                             skb->data, skb->len);
-               dev_kfree_skb(skb);
-               if (ret < 0)
-                       goto out_sleep;
+               if (!is_zero_ether_addr(wl->bssid)) {
+                       ret = wl1251_build_null_data(wl);
+                       if (ret < 0)
+                               goto out_sleep;
 
-               ret = wl1251_build_qos_null_data(wl);
-               if (ret < 0)
-                       goto out;
+                       ret = wl1251_build_qos_null_data(wl);
+                       if (ret < 0)
+                               goto out_sleep;
 
-               if (wl->bss_type != BSS_TYPE_IBSS) {
                        ret = wl1251_join(wl, wl->bss_type, wl->channel,
                                          wl->beacon_int, wl->dtim_period);
                        if (ret < 0)