From ff7c5c3beff79e3f09b9805ff3cff29e2799ec61 Mon Sep 17 00:00:00 2001 From: Vladimir Kondratiev Date: Tue, 23 Dec 2014 09:47:23 +0200 Subject: [PATCH] wil6210: workaround for BACK establishment race When establishing BACK, WMI may be handled earlier then Rx, in this case late Rx will be mis-handled. Detect early Rx and pass it to the stack, bypass reordering Signed-off-by: Vladimir Kondratiev Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/wil6210/rx_reorder.c | 25 +++++++++++++------ 1 file changed, 18 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/ath/wil6210/rx_reorder.c b/drivers/net/wireless/ath/wil6210/rx_reorder.c index 20d65f224f7c..5af8012f931e 100644 --- a/drivers/net/wireless/ath/wil6210/rx_reorder.c +++ b/drivers/net/wireless/ath/wil6210/rx_reorder.c @@ -127,13 +127,24 @@ void wil_rx_reorder(struct wil6210_priv *wil, struct sk_buff *skb) * reported, and data Rx, few packets may be pass up before reorder * buffer get allocated. Catch up by pretending SSN is what we * see in the 1-st Rx packet + * + * Another scenario, Rx get delayed and we got packet from before + * BACK. Pass it to the stack and wait. */ if (r->first_time) { r->first_time = false; if (seq != r->head_seq_num) { - wil_err(wil, "Error: 1-st frame with wrong sequence" - " %d, should be %d. Fixing...\n", seq, - r->head_seq_num); + if (seq_less(seq, r->head_seq_num)) { + wil_err(wil, + "Error: frame with early sequence 0x%03x, should be 0x%03x. Waiting...\n", + seq, r->head_seq_num); + r->first_time = true; + wil_netif_rx_any(skb, ndev); + goto out; + } + wil_err(wil, + "Error: 1-st frame with wrong sequence 0x%03x, should be 0x%03x. Fixing...\n", + seq, r->head_seq_num); r->head_seq_num = seq; r->ssn = seq; } @@ -279,6 +290,7 @@ static void wil_back_rx_handle(struct wil6210_priv *wil, int ba_policy = req->ba_param_set & BIT(1); u16 agg_timeout = req->ba_timeout; u16 status = WLAN_STATUS_SUCCESS; + u16 ssn = req->ba_seq_ctrl >> 4; unsigned long flags; int rc; @@ -297,9 +309,9 @@ static void wil_back_rx_handle(struct wil6210_priv *wil, } wil_dbg_wmi(wil, - "ADDBA request for CID %d %pM TID %d size %d timeout %d AMSDU%s policy %d token %d\n", + "ADDBA request for CID %d %pM TID %d size %d timeout %d AMSDU%s policy %d token %d SSN 0x%03x\n", cid, sta->addr, tid, req_agg_wsize, req->ba_timeout, - agg_amsdu ? "+" : "-", !!ba_policy, req->dialog_token); + agg_amsdu ? "+" : "-", !!ba_policy, req->dialog_token, ssn); /* apply policies */ if (ba_policy) { @@ -318,8 +330,7 @@ static void wil_back_rx_handle(struct wil6210_priv *wil, spin_lock_irqsave(&sta->tid_rx_lock, flags); wil_tid_ampdu_rx_free(wil, sta->tid_rx[tid]); - sta->tid_rx[tid] = wil_tid_ampdu_rx_alloc(wil, agg_wsize, - req->ba_seq_ctrl >> 4); + sta->tid_rx[tid] = wil_tid_ampdu_rx_alloc(wil, agg_wsize, ssn); spin_unlock_irqrestore(&sta->tid_rx_lock, flags); } -- 2.39.5