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Date: Sun, 3 Aug 2008 12:08:50 +0200 From: Jarek Poplawski <jarkao2@...il.com> To: David Miller <davem@...emloft.net> Cc: emil.s.tantilov@...el.com, jeffrey.t.kirsher@...el.com, netdev@...r.kernel.org Subject: Re: [BUG] NULL pointer dereference in skb_dequeue On Sun, Aug 03, 2008 at 02:56:16AM -0700, David Miller wrote: > From: Jarek Poplawski <jarkao2@...il.com> > Date: Sun, 3 Aug 2008 11:29:26 +0200 > > > After some re-checking one more question: why do you think this > > qdisc_root_lock() is safe as sch_tree_lock() (or anywhere else)? It > > seems, eg. during deactivation it can get root_lock of qdisc_default, > > and proceed with another qdisc? > > We hold RTNL at the time. > > If it's the default qdisc, that's fine, we'll reset it and free > up the packets when the RCU handler of the qdisc_destroy() runs. > > That's a case where locking the wrong qdisc is OK. Right! Thanks again, Jarek P. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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