From b5326db8bb058a32c22ed82a8e359a8fe6f0bf9b Mon Sep 17 00:00:00 2001 From: Emmanuel Grumbach Date: Wed, 7 Dec 2011 10:32:36 +0200 Subject: [PATCH] iwlwifi: don't accept Tx packets when draining HW queues If the agg SM is in IWL_EMPTYING_HW_QUEUE_ADDBA or in IWL_EMPTYING_HW_QUEUE_DELBA, we are not supposed to get Tx packets from mac80211. mac80211 is supposed to buffer these packets for us. A few issues have been identified in this mechanism, not all of them were fixed. Signed-off-by: Emmanuel Grumbach Signed-off-by: Wey-Yi Guy --- drivers/net/wireless/iwlwifi/iwl-agn-tx.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c index ae35c537b58c..c664c2726553 100644 --- a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c +++ b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c @@ -388,6 +388,14 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb) goto drop_unlock_sta; } + /* We can receive packets from the stack in IWL_AGG_{ON,OFF} + * only. Check this here. + */ + if (WARN_ONCE(tid_data->agg.state != IWL_AGG_ON && + tid_data->agg.state != IWL_AGG_OFF, + "Tx while agg.state = %d", tid_data->agg.state)) + goto drop_unlock_sta; + seq_number = tid_data->seq_number; seq_number &= IEEE80211_SCTL_SEQ; hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);