From: Miaoqing Pan miaoqing@codeaurora.org
[ Upstream commit b55379e343a3472c35f4a1245906db5158cab453 ]
Failed to transmit wmi management frames:
[84977.840894] ath10k_snoc a000000.wifi: wmi mgmt tx queue is full [84977.840913] ath10k_snoc a000000.wifi: failed to transmit packet, dropping: -28 [84977.840924] ath10k_snoc a000000.wifi: failed to submit frame: -28 [84977.840932] ath10k_snoc a000000.wifi: failed to transmit frame: -28
This issue is caused by race condition between skb_dequeue and __skb_queue_tail. The queue of ‘wmi_mgmt_tx_queue’ is protected by a different lock: ar->data_lock vs list->lock, the result is no protection. So when ath10k_mgmt_over_wmi_tx_work() and ath10k_mac_tx_wmi_mgmt() running concurrently on different CPUs, there appear to be a rare corner cases when the queue length is 1,
CPUx (skb_deuque) CPUy (__skb_queue_tail) next=list prev=list struct sk_buff *skb = skb_peek(list); WRITE_ONCE(newsk->next, next); WRITE_ONCE(list->qlen, list->qlen - 1);WRITE_ONCE(newsk->prev, prev); next = skb->next; WRITE_ONCE(next->prev, newsk); prev = skb->prev; WRITE_ONCE(prev->next, newsk); skb->next = skb->prev = NULL; list->qlen++; WRITE_ONCE(next->prev, prev); WRITE_ONCE(prev->next, next);
If the instruction ‘next = skb->next’ is executed before ‘WRITE_ONCE(prev->next, newsk)’, newsk will be lost, as CPUx get the old ‘next’ pointer, but the length is still added by one. The final result is the length of the queue will reach the maximum value but the queue is empty.
So remove ar->data_lock, and use 'skb_queue_tail' instead of '__skb_queue_tail' to prevent the potential race condition. Also switch to use skb_queue_len_lockless, in case we queue a few SKBs simultaneously.
Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.1.c2-00033-QCAHLSWMTPLZ-1
Signed-off-by: Miaoqing Pan miaoqing@codeaurora.org Reviewed-by: Brian Norris briannorris@chromium.org Signed-off-by: Kalle Valo kvalo@codeaurora.org Link: https://lore.kernel.org/r/1608618887-8857-1-git-send-email-miaoqing@codeauro... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/ath/ath10k/mac.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-)
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c index 7fbf2abcfc43..5fad38c3feb1 100644 --- a/drivers/net/wireless/ath/ath10k/mac.c +++ b/drivers/net/wireless/ath/ath10k/mac.c @@ -3336,23 +3336,16 @@ static bool ath10k_mac_need_offchan_tx_work(struct ath10k *ar) static int ath10k_mac_tx_wmi_mgmt(struct ath10k *ar, struct sk_buff *skb) { struct sk_buff_head *q = &ar->wmi_mgmt_tx_queue; - int ret = 0; - - spin_lock_bh(&ar->data_lock);
- if (skb_queue_len(q) == ATH10K_MAX_NUM_MGMT_PENDING) { + if (skb_queue_len_lockless(q) >= ATH10K_MAX_NUM_MGMT_PENDING) { ath10k_warn(ar, "wmi mgmt tx queue is full\n"); - ret = -ENOSPC; - goto unlock; + return -ENOSPC; }
- __skb_queue_tail(q, skb); + skb_queue_tail(q, skb); ieee80211_queue_work(ar->hw, &ar->wmi_mgmt_tx_work);
-unlock: - spin_unlock_bh(&ar->data_lock); - - return ret; + return 0; }
static void ath10k_mac_tx(struct ath10k *ar, struct sk_buff *skb)