From: David Miller <davem@davemloft.net>
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: a.p.zijlstra@chello.nl
Cc: tgraf@suug.ch, phillips@google.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [RFC][PATCH 2/9] deadlock prevention core
Date: Wed, 09 Aug 2006 16:58:46 -0700 (PDT) [thread overview]
Date: Wed, 09 Aug 2006 16:07:20 +0200 [thread overview]
Message-ID: <20060809.165846.107940575.davem@davemloft.net> (raw)
In-Reply-To: <1155132440.12225.70.camel@twins>
> Hmm, what does sk_buff::input_dev do? That seems to store the initial
> device?
You can run grep on the tree just as easily as I can which is what I
did to answer this question. It only takes a few seconds of your
time to grep the source tree for things like "skb->input_dev", so
would you please do that before asking more questions like this?
It does store the initial device, but as Thomas tried so hard to
explain to you guys these device pointers in the skb are transient and
you cannot refer to them outside of packet receive processing.
The reason is that there is no refcounting performed on these devices
when they are attached to the skb, for performance reasons, and thus
the device can be downed, the module for it removed, etc. long before
the skb is freed up.
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next prev parent reply other threads:[~2006-08-09 23:58 UTC|newest]
Thread overview: 140+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-08 19:33 [RFC][PATCH 0/9] Network receive deadlock prevention for NBD Peter Zijlstra
2006-08-08 19:33 ` [RFC][PATCH 1/9] pfn_to_kaddr() for UML Peter Zijlstra
2006-08-08 19:33 ` [RFC][PATCH 2/9] deadlock prevention core Peter Zijlstra
2006-08-08 20:57 ` Stephen Hemminger
2006-08-08 21:05 ` Peter Zijlstra
2006-08-09 1:33 ` Daniel Phillips
2006-08-09 1:38 ` David Miller, Daniel Phillips
2006-08-08 21:17 ` Thomas Graf
2006-08-09 1:34 ` Daniel Phillips
2006-08-09 1:39 ` David Miller, Daniel Phillips
2006-08-09 5:47 ` Daniel Phillips
2006-08-09 13:19 ` Thomas Graf
2006-08-09 14:07 ` Peter Zijlstra
2006-08-09 16:18 ` Thomas Graf
2006-08-09 16:19 ` Peter Zijlstra
2006-08-10 0:01 ` David Miller, Peter Zijlstra
2006-08-09 23:58 ` David Miller, Peter Zijlstra [this message]
2006-08-10 6:25 ` Peter Zijlstra
2006-08-11 4:24 ` Stephen Hemminger
2006-08-13 21:22 ` Daniel Phillips
2006-08-13 23:49 ` David Miller, Daniel Phillips
2006-08-14 1:15 ` Daniel Phillips
2006-08-11 2:37 ` Rik van Riel
2006-08-13 22:05 ` Daniel Phillips
2006-08-13 23:55 ` David Miller, Daniel Phillips
2006-08-14 1:31 ` Daniel Phillips
2006-08-14 1:53 ` Andrew Morton
2006-08-14 4:40 ` Peter Zijlstra
2006-08-14 4:58 ` Andrew Morton
2006-08-14 5:03 ` Peter Zijlstra
2006-08-14 5:22 ` Andrew Morton
2006-08-14 6:45 ` Peter Zijlstra
2006-08-14 7:07 ` Andrew Morton
2006-08-14 8:15 ` Peter Zijlstra
2006-08-14 8:25 ` Evgeniy Polyakov
2006-08-14 8:35 ` Peter Zijlstra
2006-08-14 8:33 ` David Miller, Andrew Morton
2006-08-17 4:27 ` Daniel Phillips
2006-08-14 7:17 ` Neil Brown
2006-08-14 7:31 ` Evgeniy Polyakov
2006-08-17 3:58 ` Daniel Phillips
2006-08-17 5:57 ` Andrew Morton
2006-08-17 23:53 ` Daniel Phillips
2006-08-18 0:24 ` Rik van Riel
2006-08-18 0:35 ` Daniel Phillips
2006-08-18 1:14 ` Neil Brown
2006-08-18 6:05 ` Andrew Morton
2006-08-18 21:22 ` Daniel Phillips
2006-08-18 22:34 ` Andrew Morton
2006-08-18 23:44 ` Daniel Phillips
2006-08-19 2:44 ` Andrew Morton
2006-08-19 4:14 ` Network receive stall avoidance (was [PATCH 2/9] deadlock prevention core) Daniel Phillips
2006-08-19 7:28 ` Andrew Morton
2006-08-19 15:06 ` [RFC][PATCH 2/9] deadlock prevention core Rik van Riel
2006-08-20 1:33 ` Andre Tomt
2006-08-19 16:53 ` Ray Lee
2006-08-21 13:27 ` Philip R. Auld
2006-08-25 10:47 ` Pavel Machek
2006-08-21 13:38 ` Jens Axboe
2006-08-08 22:10 ` David Miller
2006-08-09 1:35 ` Daniel Phillips
2006-08-09 1:41 ` David Miller, Daniel Phillips
2006-08-09 5:44 ` Daniel Phillips
2006-08-09 7:00 ` Peter Zijlstra
[not found] ` <42414.81.207.0.53.1155080443.squirrel@81.207.0.53>
2006-08-09 0:25 ` Daniel Phillips
2006-08-09 12:02 ` Indan Zupancic
2006-08-09 12:54 ` Peter Zijlstra
2006-08-09 13:48 ` Indan Zupancic
2006-08-09 14:00 ` Peter Zijlstra
2006-08-09 18:34 ` Indan Zupancic
2006-08-09 19:45 ` Peter Zijlstra
2006-08-09 20:19 ` Peter Zijlstra
2006-08-10 1:21 ` Indan Zupancic
2006-08-09 16:05 ` -v2 " Peter Zijlstra
2006-08-08 19:33 ` [RFC][PATCH 3/9] e1000 driver conversion Peter Zijlstra
2006-08-08 20:50 ` Auke Kok
2006-08-08 20:59 ` Peter Zijlstra
2006-08-08 22:32 ` David Miller, Auke Kok
2006-08-08 22:42 ` Auke Kok
2006-08-08 19:34 ` [RFC][PATCH 4/9] e100 " Peter Zijlstra
2006-08-08 20:13 ` Auke Kok
2006-08-08 20:18 ` Peter Zijlstra
2006-08-08 19:34 ` [RFC][PATCH 5/9] r8169 " Peter Zijlstra
2006-08-08 19:34 ` [RFC][PATCH 6/9] tg3 " Peter Zijlstra
2006-08-08 19:34 ` [RFC][PATCH 7/9] UML eth " Peter Zijlstra
2006-08-08 19:34 ` [RFC][PATCH 8/9] 3c59x " Peter Zijlstra
2006-08-08 23:07 ` Jeff Garzik
2006-08-09 5:51 ` Daniel Phillips
2006-08-09 5:55 ` David Miller, Daniel Phillips
2006-08-09 6:30 ` Jeff Garzik
2006-08-09 7:03 ` Peter Zijlstra
2006-08-09 7:20 ` Jeff Garzik
2006-08-13 19:38 ` Daniel Phillips
2006-08-13 19:53 ` Jeff Garzik
2006-08-08 19:34 ` [RFC][PATCH 9/9] deadlock prevention for NBD Peter Zijlstra
2006-08-09 5:46 ` [RFC][PATCH 0/9] Network receive " Evgeniy Polyakov
2006-08-09 5:52 ` Daniel Phillips
2006-08-09 5:56 ` David Miller, Daniel Phillips
2006-08-09 5:53 ` David Miller, Evgeniy Polyakov
2006-08-09 5:55 ` Evgeniy Polyakov
2006-08-09 12:37 ` Peter Zijlstra
2006-08-09 13:07 ` Evgeniy Polyakov
2006-08-09 13:32 ` Peter Zijlstra
2006-08-09 19:29 ` Evgeniy Polyakov
2006-08-09 23:54 ` David Miller, Peter Zijlstra
2006-08-10 6:06 ` Peter Zijlstra
2006-08-13 20:16 ` Daniel Phillips
2006-08-14 5:13 ` Evgeniy Polyakov
2006-08-14 6:45 ` Peter Zijlstra
2006-08-14 6:54 ` Evgeniy Polyakov
2006-08-17 4:49 ` Daniel Phillips
2006-08-17 4:48 ` Daniel Phillips
2006-08-17 5:36 ` Evgeniy Polyakov
2006-08-17 18:01 ` Daniel Phillips
2006-08-17 18:42 ` Evgeniy Polyakov
2006-08-17 19:15 ` Peter Zijlstra
2006-08-17 19:48 ` Evgeniy Polyakov
2006-08-17 23:24 ` Daniel Phillips
2006-08-18 7:16 ` Evgeniy Polyakov
2006-08-12 3:42 ` Rik van Riel
2006-08-12 8:47 ` Evgeniy Polyakov
2006-08-12 9:19 ` Peter Zijlstra
2006-08-12 9:37 ` Evgeniy Polyakov
2006-08-12 10:18 ` Peter Zijlstra
2006-08-12 10:42 ` Evgeniy Polyakov
2006-08-12 10:51 ` Evgeniy Polyakov
2006-08-12 11:40 ` Peter Zijlstra
2006-08-12 11:53 ` Evgeniy Polyakov
2006-08-13 0:46 ` David Miller, Peter Zijlstra
2006-08-13 1:11 ` Rik van Riel
2006-08-12 14:40 ` Rik van Riel
2006-08-12 14:49 ` Evgeniy Polyakov
2006-08-12 14:56 ` Rik van Riel
2006-08-12 15:08 ` Evgeniy Polyakov
2006-08-12 15:22 ` Peter Zijlstra
2006-08-14 0:56 ` Daniel Phillips
2006-08-13 0:46 ` David Miller, Evgeniy Polyakov
2006-08-13 9:06 ` Evgeniy Polyakov
2006-08-13 9:52 ` Evgeniy Polyakov
2006-08-15 19:17 ` Pavel Machek
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