ath10k: fix throughput regression in multi client mode

[Kalle Valo]

Rajkumar Manoharan <rmanohar at qti.qualcomm.com> wrote:
> commit 7a0adc83f34d ("ath10k: improve tx scheduling") is causing
> severe throughput drop in multi client mode. This issue is originally
> reported in veriwave setup with 50 clients with TCP downlink traffic.
> While increasing number of clients, the average throughput drops
> gradually. With 50 clients, the combined peak throughput is decreased
> to 98 Mbps whereas reverting given commit restored it to 550 Mbps.
> 
> Processing txqs for every tx completion is causing overhead. Ideally for
> management frame tx completion, pending txqs processing can be avoided.
> The change partly reverts the commit "ath10k: improve tx scheduling".
> Processing pending txqs after all skbs tx completion will yeild enough
> room to burst tx frames.
> 
> Fixes: 7a0adc83f34d ("ath10k: improve tx scheduling")
> Signed-off-by: Rajkumar Manoharan <rmanohar at qti.qualcomm.com>

I'm planning to queue this to 4.8 if no objections.

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https://patchwork.kernel.org/patch/9303279/