Commit 17200811 authored Jun 28, 2007 by Jarek Poplawski Committed by David S. Miller Jun 28, 2007

[NETPOLL] netconsole: fix soft lockup when removing module



#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.

#2
After deleting a timer in cancel_[rearming_]delayed_work() there could
stay a last skb queued in npinfo->txq causing a memory leak after
kfree(npinfo).

Initial patch & testing by: Jason Wessel <jason.wessel@windriver.com>

Signed-off-by: Jarek Poplawski <jarkao2@o2.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 25243633

net/core/netpoll.c

+9 −2

Original line number	Diff line number	Diff line
		@@ -72,6 +72,7 @@ static void queue_process(struct work_struct *work)
		netif_tx_unlock(dev);
		local_irq_restore(flags);

		if (atomic_read(&npinfo->refcnt))
		schedule_delayed_work(&npinfo->tx_work, HZ/10);
		return;
		}
		@@ -785,9 +786,15 @@ void netpoll_cleanup(struct netpoll *np)
		if (atomic_dec_and_test(&npinfo->refcnt)) {
		skb_queue_purge(&npinfo->arp_tx);
		skb_queue_purge(&npinfo->txq);
		cancel_rearming_delayed_work(&npinfo->tx_work);
		cancel_delayed_work(&npinfo->tx_work);
		flush_scheduled_work();

		/* clean after last, unfinished work */
		if (!skb_queue_empty(&npinfo->txq)) {
		struct sk_buff *skb;
		skb = __skb_dequeue(&npinfo->txq);
		kfree_skb(skb);
		}
		kfree(npinfo);
		}
		}