[NETPOLL]: Fixups for 'fix soft lockup when removing module'
>From my recent patch:
> > #1
> > Until kernel ver. 2.6.21 (including) cancel_rearming_delayed_work()
> > required a work function should always (unconditionally) rearm with
> > delay > 0 - otherwise it would endlessly loop. This patch replaces
> > this function with cancel_delayed_work(). Later kernel versions don't
> > require this, so here it's only for uniformity.
But Oleg Nesterov <oleg@tv-sign.ru> found:
> But 2.6.22 doesn't need this change, why it was merged?
>
> In fact, I suspect this change adds a race,
...
His description was right (thanks), so this patch reverts #1.
Signed-off-by: Jarek Poplawski <jarkao2@o2.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index cf40ff9..a0efdd7 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -72,8 +72,7 @@
netif_tx_unlock(dev);
local_irq_restore(flags);
- if (atomic_read(&npinfo->refcnt))
- schedule_delayed_work(&npinfo->tx_work, HZ/10);
+ schedule_delayed_work(&npinfo->tx_work, HZ/10);
return;
}
netif_tx_unlock(dev);
@@ -786,8 +785,7 @@
if (atomic_dec_and_test(&npinfo->refcnt)) {
skb_queue_purge(&npinfo->arp_tx);
skb_queue_purge(&npinfo->txq);
- cancel_delayed_work(&npinfo->tx_work);
- flush_scheduled_work();
+ cancel_rearming_delayed_work(&npinfo->tx_work);
/* clean after last, unfinished work */
if (!skb_queue_empty(&npinfo->txq)) {