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carl9170: fix frame delivery if sta is in powersave mode

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Nicolas Cavallari discovered that carl9170 has some
serious problems delivering data to sleeping stations.

It turns out that the driver was not honoring two
important flags (IEEE80211_TX_CTL_POLL_RESPONSE and
IEEE80211_TX_CTL_CLEAR_PS_FILT) which are set on
frames that should be sent although the receiving
station is still in powersave mode.

Cc: stable <stable@vger.kernel.org>
Reported-by: Nicolas Cavallari <Nicolas.Cavallari@lri.fr>
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Christian Lamparter 2012-02-25 21:36:36 +01:00 committed by John W. Linville
parent 992d52529d
commit 9926a67557
1 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/wireless/ath/carl9170/tx.c
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@ -1234,6 +1234,7 @@ static bool carl9170_tx_ps_drop(struct ar9170 *ar, struct sk_buff *skb)
{
struct ieee80211_sta *sta;
struct carl9170_sta_info *sta_info;
struct ieee80211_tx_info *tx_info;
rcu_read_lock();
sta = __carl9170_get_tx_sta(ar, skb);
@ -1241,12 +1242,13 @@ static bool carl9170_tx_ps_drop(struct ar9170 *ar, struct sk_buff *skb)
goto out_rcu;
sta_info = (void *) sta->drv_priv;
if (unlikely(sta_info->sleeping)) {
struct ieee80211_tx_info *tx_info;
tx_info = IEEE80211_SKB_CB(skb);
if (unlikely(sta_info->sleeping) &&
!(tx_info->flags & (IEEE80211_TX_CTL_POLL_RESPONSE |
IEEE80211_TX_CTL_CLEAR_PS_FILT))) {
rcu_read_unlock();
tx_info = IEEE80211_SKB_CB(skb);
if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
atomic_dec(&ar->tx_ampdu_upload);