From: David S. Miller <davem@sunset.davemloft.net>
Date: Tue, 30 Oct 2007 04:28:47 +0000 (-0700)
Subject: [NET]: Fix race between poll_napi() and net_rx_action()
X-Git-Tag: v2.6.24-rc2~79^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0a7606c121d58c1831805262c5b764e181429e7d;p=pandora-kernel.git

[NET]: Fix race between poll_napi() and net_rx_action()

netpoll_poll_lock() synchronizes the ->poll() invocation
code paths, but once we have the lock we have to make
sure that NAPI_STATE_SCHED is still set.  Otherwise we
get:

	cpu 0			cpu 1

	net_rx_action()		poll_napi()
	netpoll_poll_lock()	... spin on ->poll_lock
	->poll()
	  netif_rx_complete
	netpoll_poll_unlock()	acquire ->poll_lock()
				->poll()
				 netif_rx_complete()
				 CRASH

Based upon a bug report from Tina Yang.

Signed-off-by: David S. Miller <davem@davemloft.net>
---

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