From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@osdl.org>
Subject: netif_poll_disable() hangs
Date: Sun, 7 Sep 2003 23:21:45 -0700
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To: "David S. Miller" <davem@redhat.com>
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Very simple:

	ifup eth0
	ifdown eth0
	ifup eth0
	ifdown eth0	<- hangs in dev_close -> netif_poll_disable()


Because the first close sets __LINK_STATE_RX_SCHED and nothing ever clears
it.