From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 15 Apr 2010 07:14:07 +0000 (-0700)
Subject: net: netif_rx() must disable preemption
X-Git-Tag: v2.6.35-rc1~473^2~463
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b0e28f1effd1d840b36e961edc1def81e01b1ca1;p=pandora-kernel.git

net: netif_rx() must disable preemption

Eric Paris reported netif_rx() is calling smp_processor_id() from
preemptible context, in particular when caller is
ip_dev_loopback_xmit().

RPS commit added this smp_processor_id() call, this patch makes sure
preemption is disabled. rps_get_cpus() wants rcu_read_lock() anyway, we
can dot it a bit earlier.

Reported-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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