ipv6: fix a lockdep splat

ipv6: fix a lockdep splat

Orabug: 23330945

Orabug: 23330945

[ Upstream commit 44c3d0c1c0a880354e9de5d94175742e2c7c9683 ]

Silence lockdep false positive about rcu_dereference() being
used in the wrong context.

First one should use rcu_dereference_protected() as we own the spinlock.

Second one should be a normal assignation, as no barrier is needed.

Fixes: 18367681a10bd ("ipv6 flowlabel: Convert np->ipv6_fl_list to RCU.")
Reported-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
(cherry picked from commit 6c92a8f0502d3e9a9036473408f7f67b58f22ea9)

Signed-off-by: Dan Duval <dan.duval@oracle.com>
(cherry picked from commit 8ca54cd2d7e8d64c008d5f804518494740ddf711)

Signed-off-by: Dan Duval <dan.duval@oracle.com>