sfc-falcon: get rid of custom busy polling code
In linux-4.5, busy polling was implemented in core NAPI stack, meaning that all custom implementation can be removed from drivers. Not only we remove lot's of tricky code, we also remove one lock operation in fast path. Signed-off-by: NEric Dumazet <edumazet@google.com> Cc: Edward Cree <ecree@solarflare.com> Cc: Bert Kenward <bkenward@solarflare.com> Acked-by: NBert Kenward <bkenward@solarflare.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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