From: Patrick McHardy <kaber@trash.net>
To: David Miller <davem@davemloft.net>
Cc: shemminger@linux-foundation.org, netdev@vger.kernel.org
Subject: Re: [IPV4 3/5] fib_trie: dump doesnt use RCU
Date: Thu, 24 Jan 2008 07:47:39 +0100 [thread overview]
Message-ID: <4798348B.4080300@trash.net> (raw)
In-Reply-To: <20080123.224337.80401207.davem@davemloft.net>
David Miller wrote:
> From: Patrick McHardy <kaber@trash.net>
> Date: Thu, 24 Jan 2008 07:41:08 +0100
>
>
>> David Miller wrote:
>>
>>> and nothing in that code path retakes the RTNL semaphore.
>>>
>> Actually we're always holding the rtnl during dumps, nlk->cb_mutex points
>> to rtnl_mutex in case of rtnetlink. It used to be held only during the first
>> ->dump invocation and not on continuations, but I changed this a few
>> versions ago.
>>
>
> My bad. Thanks for the correction Patrick.
>
> But continuations can occur on subsequent recvmsg() calls,
> does it return to userspace with the mutex held? If so
> I'm pretty sure that's not allowed.
>
No, the mutex is dropped between different ->dump invocations.
next prev parent reply other threads:[~2008-01-24 6:47 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20080123224844.610730277@linux-foundation.org>
2008-01-23 22:48 ` [IPV4 1/5] fib_trie: more whitespace cleanup Stephen Hemminger
2008-01-24 4:37 ` David Miller
2008-01-23 22:48 ` [IPV4 2/5] fib_trie: remove unneeded NULL check Stephen Hemminger
2008-01-24 4:38 ` David Miller
2008-01-23 22:48 ` [IPV4 3/5] fib_trie: dump doesnt use RCU Stephen Hemminger
2008-01-24 4:50 ` David Miller
2008-01-24 6:41 ` Patrick McHardy
2008-01-24 6:43 ` David Miller
2008-01-24 6:47 ` Patrick McHardy [this message]
2008-01-24 7:26 ` David Miller
2008-01-24 6:45 ` Stephen Hemminger
2008-01-24 7:27 ` David Miller
2008-01-24 21:51 ` [PATCH] fib_trie: rescan if key is lost during dump Stephen Hemminger
2008-01-25 8:23 ` Jarek Poplawski
2008-01-25 16:13 ` Stephen Hemminger
2008-01-25 19:01 ` Jarek Poplawski
2008-02-01 0:45 ` David Miller
2008-01-23 22:48 ` [IPV4 4/5] fib_trie: version 0.410 Stephen Hemminger
2008-01-24 4:50 ` David Miller
2008-01-23 22:48 ` [IPV4 5/5] fib_semantics: sparse warnings Stephen Hemminger
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4798348B.4080300@trash.net \
--to=kaber@trash.net \
--cc=davem@davemloft.net \
--cc=netdev@vger.kernel.org \
--cc=shemminger@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.