linux-kernel - Re: [PATCHv2 net-next] dropwatch: Support monitoring of dropped frames

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Date:   Tue, 04 Aug 2020 16:14:14 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     izabela.bakollari@...il.com
Cc:     nhorman@...driver.com, kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCHv2 net-next] dropwatch: Support monitoring of dropped
 frames

From: izabela.bakollari@...il.com
Date: Tue,  4 Aug 2020 18:09:08 +0200

> @@ -1315,6 +1334,53 @@ static int net_dm_cmd_trace(struct sk_buff *skb,
>  	return -EOPNOTSUPP;
>  }
>  
> +static int net_dm_interface_start(struct net *net, const char *ifname)
> +{
> +	struct net_device *nd = dev_get_by_name(net, ifname);
> +
> +	if (nd)
> +		interface = nd;
> +	else
> +		return -ENODEV;
> +
> +	return 0;
> +}
> +
> +static int net_dm_interface_stop(struct net *net, const char *ifname)
> +{
> +	dev_put(interface);
> +	interface = NULL;
> +
> +	return 0;
> +}

Where is the netdev notifier that will drop this reference if the network
device is unregistered?