Messages in this thread | | | Date | Mon, 15 Oct 2007 18:03:20 +0100 (BST) | From | "Maciej W. Rozycki" <> | Subject | Re: [PATCH] PHYLIB: IRQ event workqueue handling fixes |
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On Mon, 15 Oct 2007, Jarek Poplawski wrote:
> Could you explain why cancel_work_sync() is better here than > flush_scheduled_work() wrt. rtnl_lock()?
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.0610031509380.4642%40blysk.ds.pg.gda.pl
and then discussed again:
http://www.uwsg.indiana.edu/hypermail/linux/kernel/0612.0/0593.html
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