netdev - Re: [Bugme-new] [Bug 12515] New: possible circular locking #0: (sk_lock-AF_PACKET){--..}, at: [<c1279838>] sock

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Message-ID: <20090130135617.GA16106@ff.dom.local>
Date:	Fri, 30 Jan 2009 13:56:17 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Martin MOKREJŠ 
	<mmokrejs@...osome.natur.cuni.cz>, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, bugme-daemon@...zilla.kernel.org,
	vegard.nossum@...il.com, a.p.zijlstra@...llo.nl,
	davem@...emloft.net
Subject: Re: [Bugme-new] [Bug 12515] New: possible circular locking #0:
	(sk_lock-AF_PACKET){--..}, at: [<c1279838>]
	sock_setsockopt+0x12b/0x4a4

On Fri, Jan 30, 2009 at 11:49:47PM +1100, Herbert Xu wrote:
...
> Dave pointed out that a spin lock is illegal for this purpose
> as vm_insert_page can do a GFP_KERNEL allocation.  So I've added
> a mutex for this.
...
> I resisted the temptation to create a new spin lock because the
> mmap path isn't exactly common.

So, Dave is stronger than the temptation...

Jarek P.
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