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Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes

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From: Maciej W. Rozycki <macro@...>
To: Jarek Poplawski <jarkao2@...>
Cc: Andy Fleming <afleming@...>, Andrew Morton <akpm@...>, Jeff Garzik <jgarzik@...>, <netdev@...>, <linux-kernel@...>
Subject: Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes
Date: Monday, October 15, 2007 - 1:03 pm

On Mon, 15 Oct 2007, Jarek Poplawski wrote:


 Well, this is actually the bit that made cancel_work_sync() be written in 
the first place.  The short story is the netlink lock is most probably 
held at this point (depending on the usage of phy_disconnect()) and there 
is also an event waiting in the queue that requires the lock, so if 
flush_scheduled_work() is called here a deadlock will happen.

 Let me find a reference for a longer story...:

http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=Pine.LNX.4.64N.0610031509380...

and then discussed again:

http://www.uwsg.indiana.edu/hypermail/linux/kernel/0612.0/0593.html

  Maciej
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Messages in current thread:
[PATCH] PHYLIB: IRQ event workqueue handling fixes, Maciej W. Rozycki, (Wed Sep 19, 10:38 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Jarek Poplawski, (Mon Oct 15, 8:53 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Maciej W. Rozycki, (Mon Oct 15, 1:03 pm)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Jarek Poplawski, (Tue Oct 16, 2:21 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Maciej W. Rozycki, (Tue Oct 16, 1:19 pm)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Jarek Poplawski, (Wed Oct 17, 4:58 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Maciej W. Rozycki, (Thu Oct 18, 7:30 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Maciej W. Rozycki, (Fri Oct 19, 7:38 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Jarek Poplawski, (Fri Oct 19, 10:39 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Benjamin Herrenschmidt, (Fri Oct 19, 5:46 pm)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Maciej W. Rozycki, (Fri Oct 19, 1:58 pm)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Jarek Poplawski, (Fri Oct 19, 4:17 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Maciej W. Rozycki, (Fri Oct 19, 8:57 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Jarek Poplawski, (Thu Oct 18, 10:37 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Maciej W. Rozycki, (Thu Oct 18, 11:31 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Jarek Poplawski, (Thu Oct 18, 2:31 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Maciej W. Rozycki, (Thu Oct 18, 7:37 am)
[PATCH] flush_work_sync vs. flush_scheduled_work Re: [PATCH]..., Jarek Poplawski, (Thu Oct 18, 3:05 am)
Re: [PATCH] flush_work_sync vs. flush_scheduled_work Re: [PA..., Oleg Nesterov, (Thu Oct 18, 11:48 am)
Re: [PATCH] flush_work_sync vs. flush_scheduled_work Re: [PA..., Johannes Berg, (Fri Oct 19, 4:00 am)
Re: [PATCH] flush_work_sync vs. flush_scheduled_work Re: [PA..., Jarek Poplawski, (Fri Oct 19, 3:50 am)
Re: [PATCH] flush_work_sync vs. flush_scheduled_work Re: [PA..., Jarek Poplawski, (Mon Oct 22, 2:11 am)
Re: [PATCH] flush_work_sync vs. flush_scheduled_work Re: [PA..., Oleg Nesterov, (Mon Oct 22, 2:02 pm)
Re: [PATCH] flush_work_sync vs. flush_scheduled_work Re: [PA..., Jarek Poplawski, (Tue Oct 23, 5:21 am)
Re: [PATCH] flush_work_sync vs. flush_scheduled_work Re: [PA..., Jarek Poplawski, (Tue Oct 23, 2:59 am)
Re: [PATCH] flush_work_sync vs. flush_scheduled_work Re: [PA..., Jarek Poplawski, (Fri Oct 19, 4:01 am)
Re: [PATCH] flush_work_sync vs. flush_scheduled_work Re: [PA..., Maciej W. Rozycki, (Thu Oct 18, 11:58 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Benjamin Herrenschmidt, (Wed Oct 17, 5:08 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Jarek Poplawski, (Wed Oct 17, 5:09 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Andrew Morton, (Thu Sep 20, 7:53 pm)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Maciej W. Rozycki, (Fri Sep 21, 8:51 am)
Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes, Andrew Morton, (Fri Sep 21, 2:42 pm)