ath11k: fix mgmt_tx_wmi cmd sent to FW for deleted vdev

In Multi-AP VAP scenario with frequent interface up-down, there is a
chance that ath11k_mgmt_over_wmi_tx_work() will dequeue a skb
corresponding to currently deleted/stopped vdev.

FW will assert on receiving mgmt_tx_wmi cmd for already deleted vdev.
Hence adding validation checks for arvif present on the corresponding
ar before sending mgmt_tx_wmi cmd.
Signed-off-by: Sathishkumar Muruganandam <murugana@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1588049126-1490-2-git-send-email-murugana@codeaurora.org

drivers/net/wireless/ath/ath11k/mac.c

@@ -3793,16 +3793,31 @@ static void ath11k_mgmt_over_wmi_tx_work(struct work_struct *work)
 
 	while ((skb = skb_dequeue(&ar->wmi_mgmt_tx_queue)) != NULL) {
 		info = IEEE80211_SKB_CB(skb);
-		arvif = ath11k_vif_to_arvif(info->control.vif);
+		if (!info->control.vif) {
+			ath11k_warn(ar->ab, "no vif found for mgmt frame, flags 0x%x\n",
+				    info->control.flags);
+			ieee80211_free_txskb(ar->hw, skb);
+			continue;
+		}
 
+		arvif = ath11k_vif_to_arvif(info->control.vif);
+		if (ar->allocated_vdev_map & (1LL << arvif->vdev_id) &&
+		    arvif->is_started) {
 			ret = ath11k_mac_mgmt_tx_wmi(ar, arvif, skb);
 			if (ret) {
-			ath11k_warn(ar->ab, "failed to transmit management frame %d\n",
-				    ret);
+				ath11k_warn(ar->ab, "failed to tx mgmt frame, vdev_id %d :%d\n",
+					    arvif->vdev_id, ret);
 				ieee80211_free_txskb(ar->hw, skb);
 			} else {
 				atomic_inc(&ar->num_pending_mgmt_tx);
 			}
+		} else {
+			ath11k_warn(ar->ab,
+				    "dropping mgmt frame for vdev %d, flags 0x%x is_started %d\n",
+				    arvif->vdev_id, info->control.flags,
+				    arvif->is_started);
+			ieee80211_free_txskb(ar->hw, skb);
+		}
 	}
 }