Merge branch 'r8152-napi-fixes'

Hayes Wang says:

====================
r8152: fix scheduling napi

v3:
simply the argument for patch #3. Replace &tp->napi with napi.

v2:
Add smp_mb__after_atomic() for patch #1.

v1:
Scheduling the napi during the following periods would let it be ignored.
And the events wouldn't be handled until next napi_schedule() is called.

1. after napi_disable and before napi_enable().
2. after all actions of napi function is completed and before calling
   napi_complete().

If no next napi_schedule() is called, tx or rx would stop working.

In order to avoid these situations, the followings solutions are applied.

1. prevent start_xmit() from calling napi_schedule() during runtime suspend
   or after napi_disable().
2. re-schedule the napi for tx if it is necessary.
3. check if any rx is finished or not after napi_enable().
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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