netdev - Re: [PATCH 1/2][PPPOL2TP]: Make locking calls softirq-safe

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Date:	Wed, 05 Mar 2008 18:39:21 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jchapman@...alix.com
Cc:	netdev@...r.kernel.org, jarkao2@...il.com
Subject: Re: [PATCH 1/2][PPPOL2TP]: Make locking calls softirq-safe

From: James Chapman <jchapman@...alix.com>
Date: Wed, 5 Mar 2008 23:20:37 GMT

> Fix locking issues in the pppol2tp driver which can cause a kernel
> crash on SMP boxes. There were two problems:-
> 
> 1. The driver was violating read_lock() and write_lock() scheduling
>    rules because it wasn't using softirq-safe locks in softirq
>    contexts. So we now consistently use the _bh variants of the lock
>    functions.
> 
> 2. The driver was calling sk_dst_get() in pppol2tp_xmit() which was
>    taking sk_dst_lock in softirq context. We now call __sk_dst_get().
> 
> Signed-off-by: James Chapman <jchapman@...alix.com>

Applied.
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