From 60f85bea25d5e9915da8b0c87275143b317cec3b Mon Sep 17 00:00:00 2001
From: Michal Kazior <michal.kazior@tieto.com>
Date: Wed, 16 Oct 2013 16:46:24 +0300
Subject: ath10k: fix FW crashes on heavy TX on 10.1.389 AP FW

10.1.389 firmware has some differences in
calculation of number of outstanding HTT TX
completions. This led to FW crashes of 10.1.389
while main firmware branch was unnaffected.

The patch makes sure ath10k doesn't queue up more
MSDUs than it should.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

diff --git a/drivers/net/wireless/ath/ath10k/ce.c b/drivers/net/wireless/ath/ath10k/ce.c
index e46951b..d243f28 100644
--- a/drivers/net/wireless/ath/ath10k/ce.c
+++ b/drivers/net/wireless/ath/ath10k/ce.c
@@ -1050,6 +1050,17 @@ struct ath10k_ce_pipe *ath10k_ce_init(struct ath10k *ar,
 	u32 ctrl_addr = ath10k_ce_base_address(ce_id);
 	int ret;
 
+	/*
+	 * Make sure there's enough CE ringbuffer entries for HTT TX to avoid
+	 * additional TX locking checks.
+	 *
+	 * For the lack of a better place do the check here.
+	 */
+	BUILD_BUG_ON(TARGET_NUM_MSDU_DESC >
+		     (CE_HTT_H2T_MSG_SRC_NENTRIES - 1));
+	BUILD_BUG_ON(TARGET_10X_NUM_MSDU_DESC >
+		     (CE_HTT_H2T_MSG_SRC_NENTRIES - 1));
+
 	ret = ath10k_pci_wake(ar);
 	if (ret)
 		return NULL;
diff --git a/drivers/net/wireless/ath/ath10k/htt_tx.c b/drivers/net/wireless/ath/ath10k/htt_tx.c
index d9335e9..f1d36d2 100644
--- a/drivers/net/wireless/ath/ath10k/htt_tx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_tx.c
@@ -85,16 +85,13 @@ void ath10k_htt_tx_free_msdu_id(struct ath10k_htt *htt, u16 msdu_id)
 
 int ath10k_htt_tx_attach(struct ath10k_htt *htt)
 {
-	u8 pipe;
-
 	spin_lock_init(&htt->tx_lock);
 	init_waitqueue_head(&htt->empty_tx_wq);
 
-	/* At the beginning free queue number should hint us the maximum
-	 * queue length */
-	pipe = htt->ar->htc.endpoint[htt->eid].ul_pipe_id;
-	htt->max_num_pending_tx = ath10k_hif_get_free_queue_number(htt->ar,
-								   pipe);
+	if (test_bit(ATH10K_FW_FEATURE_WMI_10X, htt->ar->fw_features))
+		htt->max_num_pending_tx = TARGET_10X_NUM_MSDU_DESC;
+	else
+		htt->max_num_pending_tx = TARGET_NUM_MSDU_DESC;
 
 	ath10k_dbg(ATH10K_DBG_BOOT, "htt tx max num pending tx %d\n",
 		   htt->max_num_pending_tx);
-- 
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