Re: [RESEND v1 net-next 2/5] net: stmmac: make stmmac_interrupt() function more friendly to MSI

[Jakub Kicinski]

On Tue, 16 Mar 2021 20:18:20 +0800 Voon Weifeng wrote:
> +     if (unlikely(!dev)) {
> +             netdev_err(priv->dev, "%s: invalid dev pointer\n", __func__);
> +             return IRQ_NONE;
> +     }

Where did this check come from? Please avoid defensive programming 
in the kernel unless you can point out how the condition can arise
legitimately.