blob: eaff0e7d6e8420b5a29bc975c58bdef0ec28ac08 [file] [log] [blame]
From e363d09ac8b915ebafb538d50655bf9f8b2db178 Mon Sep 17 00:00:00 2001
From: Rakesh Pillai <>
Date: Tue, 21 Jan 2020 12:42:28 +0530
Subject: [PATCH] ath10k: Correct the DMA direction for management tx buffers
commit 6ba8b3b6bd772f575f7736c8fd893c6981fcce16 upstream.
The management packets, send to firmware via WMI, are
mapped using the direction DMA_TO_DEVICE. Currently in
case of wmi cleanup, these buffers are being unmapped
using an incorrect DMA direction. This can cause unwanted
behavior when the host driver is handling a restart
of the wlan firmware.
We might see a trace like below
[<ffffff8008098b18>] __dma_inv_area+0x28/0x58
[<ffffff8001176734>] ath10k_wmi_mgmt_tx_clean_up_pending+0x60/0xb0 [ath10k_core]
[<ffffff80088c7c50>] idr_for_each+0x78/0xe4
[<ffffff80011766a4>] ath10k_wmi_detach+0x4c/0x7c [ath10k_core]
[<ffffff8001163d7c>] ath10k_core_stop+0x58/0x68 [ath10k_core]
[<ffffff800114fb74>] ath10k_halt+0xec/0x13c [ath10k_core]
[<ffffff8001165110>] ath10k_core_restart+0x11c/0x1a8 [ath10k_core]
[<ffffff80080c36bc>] process_one_work+0x16c/0x31c
Fix the incorrect DMA direction during the wmi
management tx buffer cleanup.
Tested HW: WCN3990
Tested FW: WLAN.HL.3.1-00784-QCAHLSWMTPLZ-1
Fixes: dc405152bb6 ("ath10k: handle mgmt tx completion event")
Signed-off-by: Rakesh Pillai <>
Signed-off-by: Kalle Valo <>
Signed-off-by: Paul Gortmaker <>
diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c
index 98a90e49d666..7e1bef34ba19 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -9397,7 +9397,7 @@ static int ath10k_wmi_mgmt_tx_clean_up_pending(int msdu_id, void *ptr,
msdu = pkt_addr->vaddr;
dma_unmap_single(ar->dev, pkt_addr->paddr,
- msdu->len, DMA_FROM_DEVICE);
+ msdu->len, DMA_TO_DEVICE);
ieee80211_free_txskb(ar->hw, msdu);
return 0;