linux-kernel - Re: [net-next PATCH] net: ethernet: stmicro: stmmac: permit MTU change with interface up

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Date:   Wed, 15 Jun 2022 19:55:07 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Christian 'Ansuel' 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>,
        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] net: ethernet: stmicro: stmmac: permit MTU
 change with interface up

On Wed, 15 Jun 2022 00:41:41 +0200 Christian 'Ansuel' Marangi wrote:
> +	if (netif_running(dev)) {
> +		netdev_dbg(priv->dev, "restarting interface to change its MTU\n");
> +		stmmac_release(dev);
> +
> +		stmmac_open(dev);
> +		stmmac_set_filter(priv, priv->hw, dev);

What if stmmac_open() fails because the memory is low or is fragmented?

You'd need to invest more effort into this change and try to allocate
all the resources before shutting the device down.