netdev - Re: [PATCH/RFC net-next v3] net: dec: tulip: de2104x: Add shutdown handler to stop NIC

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Message-ID: <20201027161606.477a445e@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Tue, 27 Oct 2020 16:16:06 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org,
        lucyyan@...gle.com, moritzf@...gle.com,
        James.Bottomley@...senpartnership.com
Subject: Re: [PATCH/RFC net-next v3] net: dec: tulip: de2104x: Add shutdown
 handler to stop NIC

On Fri, 23 Oct 2020 13:28:34 -0700 Moritz Fischer wrote:
> diff --git a/drivers/net/ethernet/dec/tulip/de2104x.c b/drivers/net/ethernet/dec/tulip/de2104x.c
> index d9f6c19940ef..ea7442cc8e75 100644
> --- a/drivers/net/ethernet/dec/tulip/de2104x.c
> +++ b/drivers/net/ethernet/dec/tulip/de2104x.c
> @@ -2175,11 +2175,19 @@ static int __maybe_unused de_resume(struct device *dev_d)
>  
>  static SIMPLE_DEV_PM_OPS(de_pm_ops, de_suspend, de_resume);
>  
> +static void de_shutdown(struct pci_dev *pdev)
> +{
> +	struct net_device *dev = pci_get_drvdata(pdev);
> +
> +	de_close(dev);

Apparently I get all the best ideas when I'm about to apply something..

I don't think you can just call de_close() like that, because 
(a) it may expect rtnl_lock() to be held, and (b) it may not be open.

Perhaps call unregister_netdev(dev) - that'll close the device.
Or rtnl_lock(); dev_close(dev); rtnl_unlock();

> +}
> +
>  static struct pci_driver de_driver = {
>  	.name		= DRV_NAME,
>  	.id_table	= de_pci_tbl,
>  	.probe		= de_init_one,
>  	.remove		= de_remove_one,
> +	.shutdown	= de_shutdown,
>  	.driver.pm	= &de_pm_ops,
>  };
>