net: Fix data-races around netdev_tstamp_prequeue.
While reading netdev_tstamp_prequeue, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers. Fixes: 3b098e2d ("net: Consistent skb timestamping") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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