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    Subject[PATCH 4.9 08/31] mac80211: send ADDBA requests using the tid/queue of the aggregation session
    Date
    From: Felix Fietkau <nbd@nbd.name>

    commit 1fe98f5690c4219d419ea9cc190f94b3401cf324 upstream.

    Sending them out on a different queue can cause a race condition where a
    number of packets in the queue may be discarded by the receiver, because
    the ADDBA request is sent too early.
    This affects any driver with software A-MPDU setup which does not allocate
    packet seqno in hardware on tx, regardless of whether iTXQ is used or not.
    The only driver I've seen that explicitly deals with this issue internally
    is mwl8k.

    Cc: stable@vger.kernel.org
    Signed-off-by: Felix Fietkau <nbd@nbd.name>
    Link: https://lore.kernel.org/r/20211202124533.80388-1-nbd@nbd.name
    Signed-off-by: Johannes Berg <johannes.berg@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/mac80211/agg-tx.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/net/mac80211/agg-tx.c
    +++ b/net/mac80211/agg-tx.c
    @@ -109,7 +109,7 @@ static void ieee80211_send_addba_request
    mgmt->u.action.u.addba_req.start_seq_num =
    cpu_to_le16(start_seq_num << 4);

    - ieee80211_tx_skb(sdata, skb);
    + ieee80211_tx_skb_tid(sdata, skb, tid);
    }

    void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn)

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