netdev - Re: [PATCH net 3/3] eet: ena: invoke netif_carrier

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Date:   Tue, 02 Jan 2018 14:08:04 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     netanel@...zon.com
Cc:     netdev@...r.kernel.org, dwmw@...zon.com, zorik@...zon.com,
        matua@...zon.com, saeedb@...zon.com, msw@...zon.com,
        aliguori@...zon.com, nafea@...zon.com, evgenys@...zon.com,
        gtzalik@...zon.com
Subject: Re: [PATCH net 3/3] eet: ena: invoke netif_carrier_off() only
 after netdev registered

From: <netanel@...zon.com>
Date: Thu, 28 Dec 2017 21:30:20 +0000

> From: Netanel Belgazal <netanel@...zon.com>
> 
> netif_carrier_off() should be called only after register netdev.
> Move the function's call after the registration.
> 
> Signed-off-by: Netanel Belgazal <netanel@...zon.com>
> ---
>  drivers/net/ethernet/amazon/ena/ena_netdev.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> index fbe21a817bd8..ee50c56765a4 100644
> --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
> +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> @@ -3276,14 +3276,14 @@ static int ena_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  
>  	memcpy(adapter->netdev->perm_addr, adapter->mac_addr, netdev->addr_len);
>  
> -	netif_carrier_off(netdev);
> -
>  	rc = register_netdev(netdev);
>  	if (rc) {
>  		dev_err(&pdev->dev, "Cannot register net device\n");
>  		goto err_rss;
>  	}
>  
> +	netif_carrier_off(netdev);
> +

You cannot invoke this after register_netdev(), asynchronous activity can cause this
call to lose information and lose a link up event.