From: Keith Owens <kaos@ocs.com.au>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Chandra Seetharaman <sekharan@us.ibm.com>,
Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: Notifier chains are unsafe
Date: Wed, 02 Nov 2005 20:50:11 +1100 [thread overview]
Message-ID: <5979.1130925011@ocs3.ocs.com.au> (raw)
In-Reply-To: Your message of "Tue, 01 Nov 2005 16:20:43 CDT." <Pine.LNX.4.44L0.0511011610470.4473-100000@iolanthe.rowland.org>
On Tue, 1 Nov 2005 16:20:43 -0500 (EST),
Alan Stern <stern@rowland.harvard.edu> wrote:
>You mean the RCU-style update? It will hang when a callout routine tries
>to deregister itself as it is running, although we could add a new
>unregister_self API to handle that. Just check for num_callers equal to 1
>instead of 0.
A callout on an atomic notifer chain has no business calling the
register/unregister functions. It makes no sense for an atomic context
to call a routine that can sleep or block.
next prev parent reply other threads:[~2005-11-02 9:50 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-24 20:48 Notifier chains are unsafe Alan Stern
2005-10-25 16:59 ` Joe Seigh
2005-10-25 23:30 ` Chandra Seetharaman
2005-10-26 18:46 ` Alan Stern
2005-10-26 19:05 ` Andreas Kleen
2005-10-26 20:40 ` Alan Stern
2005-10-26 21:44 ` Andi Kleen
2005-10-26 23:20 ` Chandra Seetharaman
2005-10-27 1:17 ` Joe Seigh
2005-10-28 1:36 ` Chandra Seetharaman
2005-10-27 14:13 ` Alan Stern
2005-10-26 22:40 ` Chandra Seetharaman
2005-10-27 15:28 ` Alan Stern
2005-10-27 20:43 ` Chandra Seetharaman
2005-10-27 21:21 ` Alan Stern
2005-10-27 23:02 ` Chandra Seetharaman
2005-10-28 0:48 ` Keith Owens
2005-10-28 1:34 ` Chandra Seetharaman
2005-10-28 14:23 ` Alan Stern
2005-10-28 22:15 ` Chandra Seetharaman
2005-10-29 14:51 ` Alan Stern
2005-10-31 22:22 ` Chandra Seetharaman
2005-11-01 15:24 ` Alan Stern
2005-11-01 20:20 ` Chandra Seetharaman
2005-11-01 21:20 ` Alan Stern
2005-11-02 9:50 ` Keith Owens [this message]
2005-11-02 16:03 ` Alan Stern
[not found] ` <mailman.1130460600.30060.linux-kernel2news@redhat.com>
2005-10-28 4:35 ` Pete Zaitcev
2005-10-25 23:43 ` Andi Kleen
2005-10-26 0:01 ` Chandra Seetharaman
2005-10-26 17:11 ` Andreas Kleen
2005-10-27 2:46 ` Herbert Xu
2005-10-29 12:25 ` Joe Seigh
2005-10-26 6:11 ` Keith Owens
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