linux-kernel - Re: [net-next PATCH RFC 2/5] net: ethernet: stmicro: stmmac: first disable all queues in release

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Date:   Tue, 28 Jun 2022 20:54:35 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH RFC 2/5] net: ethernet: stmicro: stmmac: first
 disable all queues in release

On Tue, 28 Jun 2022 03:33:39 +0200 Christian Marangi wrote:
> +	stmmac_disable_all_queues(priv);
> +
> +	for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
> +		hrtimer_cancel(&priv->tx_queue[chan].txtimer);

IIRC this hrtimer is to check for completions. Canceling it before
netif_tx_disable() looks odd, presumably until the queues are stopped
the timer can get scheduled again, no?

>  	netif_tx_disable(dev);
>  
>  	if (device_may_wakeup(priv->device))
> @@ -3764,11 +3769,6 @@ static int stmmac_release(struct net_device *dev)
>  	phylink_stop(priv->phylink);
>  	phylink_disconnect_phy(priv->phylink);
>  
> -	stmmac_disable_all_queues(priv);
> -
> -	for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
> -		hrtimer_cancel(&priv->tx_queue[chan].txtimer);