netdev - Re: [Question] Usage of dev_hold()/dev

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Message-ID: <1440594621.8932.21.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 26 Aug 2015 06:10:21 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Zhangjie (HZ)" <zhangjie14@...wei.com>
Cc:	Jason Wang <jasowang@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Qinchuanyu <qinchuanyu@...wei.com>, Yewudi <yewudi@...wei.com>,
	liuyongan 00175866 <l00175866@...esmail.huawei.com.cn>,
	Wangbicheng <wangbicheng@...wei.com>,
	Yan Chen <Y.Chen@...wei.com>
Subject: Re: [Question] Usage of dev_hold()/dev_put()

On Wed, 2015-08-26 at 07:48 +0000, Zhangjie (HZ) wrote:
> Eric,
> Thank you for your patient apply.
> There is still a question, 
> In receive path, driver does not call dev_hold(), when skb goes to host stack, skb->dev is likely to be used. 
> If device is destroyed before that, it seems dangerous.

This is also handled properly.

Check : flush_backlog() in net/core/dev.c
   sock_queue_rcv_skb() , and all functions setting skb->dev to NULL


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