[PATCH v2] ath11k: add wait operation for tx management packets for flush from mac80211

[Kalle Valo]

Wen Gong <quic_wgong at quicinc.com> writes:

> 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 and tx data packets.
>
> Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01230-QCAHSTSWPLZ_V2_TO_X86-1
>
> Signed-off-by: Wen Gong <quic_wgong at quicinc.com>

I sometimes see new warnings with this patch:

[  142.346474] ath11k_pci 0000:06:00.0: failed to flush mgmt transmit queue 0
[  147.466367] ath11k_pci 0000:06:00.0: failed to flush mgmt transmit queue 0

And more importantly this breaks suspend on my NUC testbox:

[  175.141820] PM: suspend entry (deep)
[  175.150512] Filesystems sync: 0.008 seconds
[  175.229703] Freezing user space processes ... (elapsed 0.003 seconds) done.
[  175.233506] OOM killer disabled.
[  175.233588] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
[  175.242457] printk: Suspending console(s) (use no_console_suspend to debug)
[  175.245269] wlan0: deauthenticating from 00:03:7f:48:81:59 by local choice (Reason: 3=DEAUTH_LEAVING)
[  175.285881] e1000e: EEE TX LPI TIMER: 00000011
[  180.745259] ath11k_pci 0000:06:00.0: failed to flush mgmt transmit queue 0
[  185.864977] ath11k_pci 0000:06:00.0: failed to flush mgmt transmit queue 0
[  185.970601] PM: Some devices failed to suspend, or early wake event detected
[  185.974081] usb usb3: root hub lost power or was reset
[  185.974135] usb usb4: root hub lost power or was reset
[  186.098870] nvme nvme0: 8/0/0 default/read/poll queues
[  186.297077] OOM killer enabled.
[  186.297361] Restarting tasks ... done.
[  186.343733] PM: suspend exit

My setup:

Tag:	ath-202111221111

[  151.123732] ath11k_pci 0000:06:00.0: MSI vectors: 32
[  151.123851] ath11k_pci 0000:06:00.0: qca6390 hw2.0
[  151.720618] ath11k_pci 0000:06:00.0: chip_id 0x0 chip_family 0xb board_id 0xff soc_id 0xffffffff
[  151.720912] ath11k_pci 0000:06:00.0: fw_version 0x101c06cc fw_build_timestamp 2020-06-24 19:50 fw_build_id 

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