netdev - Re: [PATCH] net-tcp: fix panic in tcp_fastopen_cache

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Message-ID: <1384464152.28716.35.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 14 Nov 2013 13:22:32 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Dave Jones <davej@...hat.com>, David Miller <davem@...emloft.net>,
	netdev@...r.kernel.org, Yuchung Cheng <ycheng@...gle.com>
Subject: Re: [PATCH] net-tcp: fix panic in tcp_fastopen_cache_set()

On Thu, 2013-11-14 at 21:53 +0100, Johannes Berg wrote:

> Heh. I have no idea, it just seemed a little odd on first look given
> that __sk_dst_get() *can* actually use RCU protection. :)

Yep, the deal is that if you own socket lock, you do not need
rcu_read_lock()

Look for dst_negative_advice() as another example :

We call __sk_dst_get(sk) without rcu_read_lock() protection.



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