From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Thu, 10 Jun 2010 16:12:44 +0000 (+0000)
Subject: netpoll: Fix RCU usage
X-Git-Tag: v2.6.36-rc1~571^2~587
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=de85d99eb7b595f6751550184b94c1e2f74a828b;p=pandora-kernel.git

netpoll: Fix RCU usage

The use of RCU in netpoll is incorrect in a number of places:

1) The initial setting is lacking a write barrier.
2) The synchronize_rcu is in the wrong place.
3) Read barriers are missing.
4) Some places are even missing rcu_read_lock.
5) npinfo is zeroed after freeing.

This patch fixes those issues.  As most users are in BH context,
this also converts the RCU usage to the BH variant.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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