On Thu, 31 May 2007 01:01:37 +0400
Oleg Nesterov <[email protected]> wrote:
> Jason Wessel wrote:
> >
> > The netpoll_cleanup handler can hang the kernel if there is no work in the
> > work queue because a call to cancel_rearming_delayed_work() with no work
> > goes into an infinite loop.
>
> This should not be true any longer, cancel_rearming_delayed_work() should work
> correctly in any case.
>
> Could you please clarify?
We need a 2.6.21.x fix.
> > @@ -771,30 +771,32 @@ void netpoll_cleanup(struct netpoll *np)
> >
> > [...snip...]
> >
> > + if (atomic_dec_and_test(&npinfo->refcnt)) {
> > + skb_queue_purge(&npinfo->arp_tx);
> > + skb_queue_purge(&npinfo->txq);
> > + if (delayed_work_pending(&npinfo->tx_work)) {
> > cancel_rearming_delayed_work(&npinfo->tx_work);
> > flush_scheduled_work();
>
> But this "if (delayed_work_pending())" is racy anyway?
>
I guess so, a bit.
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