netdev - Q: why calling kobject

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Message-ID: <CAHA+R7NMp_cvVCVhaYk--Yh=0KrEE-TKZXfk1MFGjWymC8dzLQ@mail.gmail.com>
Date:	Tue, 11 Feb 2014 14:24:06 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	netdev <netdev@...r.kernel.org>
Cc:	David Miller <davem@...emloft.net>
Subject: Q: why calling kobject_put() twice?

Hi,

There are many drivers either using free_netdev() as ->destructor() or
calling it in their own destructor(), and in free_netdev() we call
put_device(&dev->dev) at last. But in netdev_run_todo(), we call
kobject_put(&dev->dev.kobj) again after calling ->destructor(). So,
what's the point of doing this?

Also, if free_netdev() is supposed to free the netdev as its name
tells, then why it's still safe to read some field of it after that?

I must miss something here.

Thanks.
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