netdev - Re: [PATCH 1/2] ipv6: do not hold route table lock when send ndisc probe

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Date:	Fri, 24 Aug 2012 11:44:44 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Cong Wang <amwang@...hat.com>
Cc:	Debabrata Banerjee <dbavatar@...il.com>, netdev@...r.kernel.org,
	"Banerjee, Debabrata" <dbanerje@...mai.com>,
	"David S. Miller" <davem@...emloft.net>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH 1/2] ipv6: do not hold route table lock when send ndisc
 probe

On Fri, 2012-08-24 at 17:15 +0800, Cong Wang wrote:

> 
> Right... If we call dev_hold() in the work, it is possible that the work
> is still not scheduled to running when we unregister the device. What's
> more, we can't flush work here as we are holding a read lock.

You need a global list (and a single work, not one per req), so that a
notifier can flush it at demand.


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