netdev - Re: [PATCH net-next] net: ethernet: mtk_wed: get rid of queue lock for rx queue

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Date:   Mon, 09 Jan 2023 16:50:55 -0800
From:   Alexander H Duyck <alexander.duyck@...il.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, lorenzo.bianconi@...hat.com, nbd@....name,
        john@...ozen.org, sean.wang@...iatek.com, Mark-MC.Lee@...iatek.com,
        sujuan.chen@...iatek.com, daniel@...rotopia.org
Subject: Re: [PATCH net-next] net: ethernet: mtk_wed: get rid of queue lock
 for rx queue

On Sat, 2023-01-07 at 15:41 +0100, Lorenzo Bianconi wrote:
> mtk_wed_wo_queue_rx_clean and mtk_wed_wo_queue_refill routines can't run
> concurrently so get rid of spinlock for rx queues.
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>

My understanding is that mtk_wed_wo_queue_refill will only be called
during init and by the tasklet. The mtk_wed_wo_queue_rx_clean function
is only called during deinit and only after the tasklet has been
disabled. That is the reason they cannot run at the same time correct?

It would be nice if you explained why they couldn't run concurrently
rather than just stating it is so in the patch description. It makes it
easier to verify assumptions that way. Otherwise the patch itself looks
good to me.

Reviewed-by: Alexander Duyck <alexanderduyck@...com>