NAPI complete race backport?

[David Miller]

Eric, could you please give me a backport of commit:

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>From 39e6c8208d7b6fb9d2047850fb3327db567b564b Mon Sep 17 00:00:00 2001
From: Eric Dumazet <eduma...@google.com>
Date: Tue, 28 Feb 2017 10:34:50 -0800
Subject: [PATCH] net: solve a NAPI race
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for 4.10 and earlier?

This is before __napi_complete() is removed, so the empty poll list
handling in napi_complete_done() needs to be a bit different.

Thanks!