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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 <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2012-03-05 11:24:37 -08:00 committed by John W. Linville
parent 15b86bff99
commit 2c6ab7ff8f
1 changed files with 18 additions and 10 deletions
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28
drivers/net/wireless/iwlwifi/iwl-agn-tx.c
View File

@ -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;
}