ath11k: Avoid mgmt tx count underflow

The mgmt tx count reference is incremented/decremented on every mgmt tx and on
tx completion event from firmware.
In case of an unexpected mgmt tx completion event from firmware,
the counter would underflow. Avoid this by decrementing
only when the tx count is greater than 0.

Signed-off-by: Sriram R <srirrama@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1585567028-9242-1-git-send-email-srirrama@codeaurora.org

diff --git a/drivers/net/wireless/ath/ath11k/wmi.c b/drivers/net/wireless/ath/ath11k/wmi.c
index 8832b8c..973b72a 100644 (file)
--- a/drivers/net/wireless/ath/ath11k/wmi.c
+++ b/drivers/net/wireless/ath/ath11k/wmi.c
@@ -3880,8 +3880,9 @@ static int wmi_process_mgmt_tx_comp(struct ath11k *ar, u32 desc_id,
 
        ieee80211_tx_status_irqsafe(ar->hw, msdu);
 
-       WARN_ON_ONCE(atomic_read(&ar->num_pending_mgmt_tx) == 0);
-       atomic_dec(&ar->num_pending_mgmt_tx);
+       /* WARN when we received this event without doing any mgmt tx */
+       if (atomic_dec_if_positive(&ar->num_pending_mgmt_tx) < 0)
+               WARN_ON_ONCE(1);
 
        return 0;
 }