In ath11k, tx of management packet is doing in a work queue. Sometimes
the workqueue does not finish tx immediately, then it lead after the next
step of vdev delete finished, it start to send the management packet to
firmware and lead firmware crash.

ieee80211_set_disassoc() have logic of ieee80211_flush_queues() after
it send_deauth_disassoc() to ath11k, its purpose is make sure the
deauth was actually sent, so it need to change ath11k to match the
purpose of mac80211.

To address these issue wait for tx mgmt as well as tx data packets.

dmesg log of connect/disconnect to AP:
[  307.522226] wls1: authenticate with 62:66:e4:e9:6a:a9
[  307.586565] wls1: send auth to 62:66:e4:e9:6a:a9 (try 1/3)
[  307.586581] ath11k_pci 0000:05:00.0: mac tx mgmt frame, buf id 0
[  307.586922] ath11k_pci 0000:05:00.0: mac tx mgmt frame, vdev_id 0
[  307.590179] ath11k_pci 0000:05:00.0: wmi mgmt tx comp pending 0 desc id 0
[  307.590181] ath11k_pci 0000:05:00.0: mgmt tx compl ev pdev_id 2, desc_id 0, status 0
[  307.598699] wls1: authenticated
[  307.599483] wls1: associate with 62:66:e4:e9:6a:a9 (try 1/3)
[  307.599506] ath11k_pci 0000:05:00.0: mac tx mgmt frame, buf id 0
[  307.599519] ath11k_pci 0000:05:00.0: mac tx mgmt frame, vdev_id 0
[  307.603059] ath11k_pci 0000:05:00.0: wmi mgmt tx comp pending 0 desc id 0
[  307.603063] ath11k_pci 0000:05:00.0: mgmt tx compl ev pdev_id 2, desc_id 0, status 0
[  307.637105] wls1: associated
[  317.365239] wls1: deauthenticating from 62:66:e4:e9:6a:a9 by local choice (Reason: 3=DEAUTH_LEAVING)
[  317.368104] ath11k_pci 0000:05:00.0: mac tx mgmt frame, buf id 0
[  317.372622] ath11k_pci 0000:05:00.0: mac tx mgmt frame, vdev_id 0
[  317.378320] ath11k_pci 0000:05:00.0: wmi mgmt tx comp pending 0 desc id 0
[  317.378330] ath11k_pci 0000:05:00.0: mgmt tx compl ev pdev_id 2, desc_id 0, status 0
[  317.378359] ath11k_pci 0000:05:00.0: mac mgmt tx flush mgmt pending 0
[  317.421066] ath11k_pci 0000:05:00.0: mac mgmt tx flush mgmt pending 0
[  317.421427] ath11k_pci 0000:05:00.0: mac remove interface (vdev 0)

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01230-QCAHSTSWPLZ_V2_TO_X86-1
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1
Signed-off-by: Wen Gong <quic_wgong@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20211202063705.14321-1-quic_wgong@quicinc.com