From 2c6ab7ff8fa9af22a2a616656da6e5a0567da285 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Mon, 5 Mar 2012 11:24:37 -0800 Subject: iwlwifi: use ieee80211_tx_status We currently use the _irqsafe version, but that isn't recommended together with ieee80211_rx() as it can cause races. If the device reports a TX-status and RX in that order then with the current combination mac80211 might process them in the other order, which can cause issues with powersaving clients. Use ieee80211_tx_status() to avoid this race. Since we don't want to call it with locks held, process the frame queues later -- this is fine as they are on the stack. Signed-off-by: Johannes Berg Signed-off-by: Wey-Yi Guy Signed-off-by: John W. Linville --- drivers/net/wireless/iwlwifi/iwl-agn-tx.c | 28 ++++++++++++++++++---------- 1 file changed, 18 insertions(+), 10 deletions(-) (limited to 'drivers/net/wireless/iwlwifi/iwl-agn-tx.c') diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c index e5ebc36a14c8..1914bee1891e 100644 --- a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c +++ b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c @@ -1007,6 +1007,8 @@ int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb, if (is_agg) iwl_rx_reply_tx_agg(priv, tx_resp); + __skb_queue_head_init(&skbs); + if (tx_resp->frame_count == 1) { u16 next_reclaimed = le16_to_cpu(tx_resp->seq_ctl); next_reclaimed = SEQ_TO_SN(next_reclaimed + 0x10); @@ -1026,8 +1028,6 @@ int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb, next_reclaimed = ssn; } - __skb_queue_head_init(&skbs); - if (tid != IWL_TID_NON_QOS) { priv->tid_data[sta_id][tid].next_reclaimed = next_reclaimed; @@ -1040,8 +1040,9 @@ int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb, ssn, status, &skbs)); iwlagn_check_ratid_empty(priv, sta_id, tid); freed = 0; - while (!skb_queue_empty(&skbs)) { - skb = __skb_dequeue(&skbs); + + /* process frames */ + skb_queue_walk(&skbs, skb) { hdr = (struct ieee80211_hdr *)skb->data; if (!ieee80211_is_data_qos(hdr->frame_control)) @@ -1083,8 +1084,6 @@ int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb, if (!is_agg) iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1); - ieee80211_tx_status_irqsafe(priv->hw, skb); - freed++; } @@ -1093,6 +1092,12 @@ int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb, iwl_check_abort_status(priv, tx_resp->frame_count, status); spin_unlock(&priv->sta_lock); + + while (!skb_queue_empty(&skbs)) { + skb = __skb_dequeue(&skbs); + ieee80211_tx_status(priv->hw, skb); + } + return 0; } @@ -1186,9 +1191,8 @@ int iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv, iwlagn_check_ratid_empty(priv, sta_id, tid); freed = 0; - while (!skb_queue_empty(&reclaimed_skbs)) { - skb = __skb_dequeue(&reclaimed_skbs); + skb_queue_walk(&reclaimed_skbs, skb) { hdr = (struct ieee80211_hdr *)skb->data; if (ieee80211_is_data_qos(hdr->frame_control)) @@ -1211,10 +1215,14 @@ int iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv, iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags, info); } - - ieee80211_tx_status_irqsafe(priv->hw, skb); } spin_unlock(&priv->sta_lock); + + while (!skb_queue_empty(&reclaimed_skbs)) { + skb = __skb_dequeue(&reclaimed_skbs); + ieee80211_tx_status(priv->hw, skb); + } + return 0; } -- cgit v1.2.1