From b3281c6cb768d880a518a74d26c4fb994f92a1f8 Mon Sep 17 00:00:00 2001 From: Ben Greear Date: Tue, 10 Sep 2019 16:46:15 +0300 Subject: ath10k: free beacon buf later in vdev teardown My wave-1 firmware often crashes when I am bringing down AP vdevs, and sometimes at least some machines lockup hard after spewing IOMMU errors. I don't see the same issue in STA mode, so I suspect beacons are the issue. Moving the beacon buf deletion to later in the vdev teardown logic appears to help this problem. Firmware still crashes often, but several iterations did not show IOMMU errors and machine didn't hang. Tested hardware: QCA9880 Tested firmware: ath10k-ct from beginning of 2019, exact version unknown Signed-off-by: Ben Greear Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath10k/mac.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'drivers/net/wireless/ath/ath10k/mac.c') diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c index 12dad659bf68..a6d21856b7e7 100644 --- a/drivers/net/wireless/ath/ath10k/mac.c +++ b/drivers/net/wireless/ath/ath10k/mac.c @@ -5503,10 +5503,6 @@ static void ath10k_remove_interface(struct ieee80211_hw *hw, mutex_lock(&ar->conf_mutex); - spin_lock_bh(&ar->data_lock); - ath10k_mac_vif_beacon_cleanup(arvif); - spin_unlock_bh(&ar->data_lock); - ret = ath10k_spectral_vif_stop(arvif); if (ret) ath10k_warn(ar, "failed to stop spectral for vdev %i: %d\n", @@ -5575,6 +5571,11 @@ static void ath10k_remove_interface(struct ieee80211_hw *hw, peer->vif = NULL; } } + + /* Clean this up late, less opportunity for firmware to access + * DMA memory we have deleted. + */ + ath10k_mac_vif_beacon_cleanup(arvif); spin_unlock_bh(&ar->data_lock); ath10k_peer_cleanup(ar, arvif->vdev_id); -- cgit v1.2.3