netdev - Re: [PATCH net-next 1/2] net: use dev->name in netdev

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Date:	Thu, 17 Jul 2014 16:29:21 +0200
From:	Tom Gundersen <teg@...m.no>
To:	Veaceslav Falico <vfalico@...il.com>
Cc:	netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next 1/2] net: use dev->name in netdev_pr* when it's available

On Thu, Jul 17, 2014 at 4:01 PM, Veaceslav Falico <vfalico@...il.com> wrote:
> On Thu, Jul 17, 2014 at 03:48:45PM +0200, Tom Gundersen wrote:
>>
>> On Thu, Jul 17, 2014 at 1:28 PM, Veaceslav Falico <vfalico@...il.com>
>> wrote:
>>>
>>> e() returns dev->name only when the net_device is in
>>> NETREG_REGISTERED state.
>>>
>>> However, dev->name is always populated on creation, so we can easily use
>>> it. The only caveat is that the device still has a name of type "eth%d",
>>> in
>>> which case we cannot use this name as it'll change in the nearest future,
>>> thus return "unnamed net_device".
>>
>>
>> There are also cases when the name is set to emptystring before being
>> populated with the real name later on. You may want to check for that
>> too.
>
>
> Sure, it'd be easy enough.
>
> Out of curiosity - can you point me to where it's an empty string?

Only a handfull places (and I didn't check if those actually use the
print functions before setting the real name):

$ git grep alloc_netdev | grep \"\"
drivers/net/hamradio/dmascc.c:    info->dev[0] = alloc_netdev(0, "",
NET_NAME_UNKNOWN, dev_setup);
drivers/net/hamradio/dmascc.c:    info->dev[1] = alloc_netdev(0, "",
NET_NAME_UNKNOWN, dev_setup);
drivers/net/ppp/ppp_generic.c:    dev = alloc_netdev(sizeof(struct
ppp), "", NET_NAME_UNKNOWN,
drivers/net/wireless/airo.c:    dev = alloc_netdev(sizeof(*ai), "",
NET_NAME_UNKNOWN, ether_setup);
net/atm/clip.c:    dev = alloc_netdev(sizeof(struct clip_priv), "",
NET_NAME_UNKNOWN,

Cheers,

Tom
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