From: Alexei Starovoitov <ast@plumgrid.com>
To: Daniel Borkmann <daniel@iogearbox.net>
Cc: "David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>, Jiri Pirko <jiri@resnulli.us>,
netdev@vger.kernel.org
Subject: Re: [PATCH net-next] net_sched: act_bpf: remove spinlock in fast path
Date: Tue, 4 Aug 2015 09:35:21 -0700 [thread overview]
Message-ID: <55C0E9C9.3070907@plumgrid.com> (raw)
In-Reply-To: <55C07DEB.1010902@iogearbox.net>
On 8/4/15 1:55 AM, Daniel Borkmann wrote:
> Okay, what happens however, when we have an action attached to a
> classifier and do a replace on that action, meaning one CPU is still
> executing the filter inside tcf_bpf(), while another one is already
> running tcf_bpf_cfg_cleanup() on that prog? Afaik, the schedule_work()
> that's called during freeing maps/progs might 'mitigate' this race,
> but doesn't give a hard guarantee, right?
ahh, yes, that's completely different race. tcf_bpf_cfg_cleanup should
be doing call_rcu.
Will respin the patch.
prev parent reply other threads:[~2015-08-04 16:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-04 5:09 [PATCH net-next] net_sched: act_bpf: remove spinlock in fast path Alexei Starovoitov
2015-08-04 8:55 ` Daniel Borkmann
2015-08-04 16:35 ` Alexei Starovoitov [this message]
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