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Date:	Thu, 21 Feb 2008 18:09:04 +0100
From:	Jarek Poplawski <>
To:	James Chapman <>
CC:	David Miller <>,
	Paul Mackerras <>,
Subject: Re: [PATCH][PPPOL2TP]: Fix SMP oops in pppol2tp driver

Jarek Poplawski wrote, On 02/21/2008 01:08 PM:

> Another, probably simpler way would be to move almost all pppol2tp_xmit

Actually, the simplest off all seems to be now this old idea to maybe make
sk_dst_lock globally softirq immune. At least I think it's worth of testing,
to check for these other possible lockdep warnings. It should only need to
change all write_ and read_lock(&sk->sk_dst_lock) in very few places:
include/net/sock.h, include/net/ip6_route.h, and net/ipv6/ipv6_sockglue.c.
This could be tested together with you full _bh locking patch (maybe except
these other changes in pppol2tp_xmit).

Jarek P.

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