mac80211: remove sta TIM flag, fix expiry TIM handling

The TIM flag that is kept in each station's info is completely
useless, there's no code (aside from the debugfs display code)
checking it, hence it can be removed. While doing that, I noticed
that the TIM handling is broken when buffered frames expire, so
fix that.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 18 insertions, 10 deletions

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index cbe00979e444..a843bb7dd2d3 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -286,6 +286,7 @@ static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
 {
         unsigned long flags;
         struct sk_buff *skb;
+        struct ieee80211_sub_if_data *sdata;
         DECLARE_MAC_BUF(mac);
 
         if (skb_queue_empty(&sta->ps_tx_buf))
@@ -294,21 +295,28 @@ static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
         for (;;) {
                 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
                 skb = skb_peek(&sta->ps_tx_buf);
-                if (sta_info_buffer_expired(local, sta, skb)) {
+                if (sta_info_buffer_expired(local, sta, skb))
                         skb = __skb_dequeue(&sta->ps_tx_buf);
-                        if (skb_queue_empty(&sta->ps_tx_buf))
-                                sta->flags &= ~WLAN_STA_TIM;
-                } else
+                else
                         skb = NULL;
                 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
 
-                if (skb) {
-                        local->total_ps_buffered--;
-                        printk(KERN_DEBUG "Buffered frame expired (STA "
-                               "%s)\n", print_mac(mac, sta->addr));
-                        dev_kfree_skb(skb);
-                } else
+                if (!skb)
                         break;
+
+                sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
+                local->total_ps_buffered--;
+                printk(KERN_DEBUG "Buffered frame expired (STA "
+                       "%s)\n", print_mac(mac, sta->addr));
+                dev_kfree_skb(skb);
+
+                if (skb_queue_empty(&sta->ps_tx_buf)) {
+                        if (sdata->bss)
+                                bss_tim_set(sta->local, sdata->bss, sta->aid);
+                        if (sta->local->ops->set_tim)
+                                sta->local->ops->set_tim(local_to_hw(sta->local),
+                                                         sta->aid, 0);
+                }
         }
 }