From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [PATCH net-next] cxgb4: Add low latency socket busy_poll support
Date: Tue, 03 Feb 2015 21:58:29 -0800
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References: <1422940816-27402-1-git-send-email-hariprasad@chelsio.com>
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	anish@chelsio.com, nirranjan@chelsio.com, praveenm@chelsio.com,
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To: Hariprasad Shenai <hariprasad@chelsio.com>
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On Tue, 2015-02-03 at 10:50 +0530, Hariprasad Shenai wrote:

> @@ -1978,9 +2016,13 @@ static int napi_rx_handler(struct napi_struct *napi, int budget)
>  {
>  	unsigned int params;
>  	struct sge_rspq *q = container_of(napi, struct sge_rspq, napi);
> -	int work_done = process_responses(q, budget);
> +	int work_done = 0;
>  	u32 val;
>  
> +	if (!cxgb_poll_lock_napi(q))
> +		return work_done;
> +


This is very suspicious. Please take a look at commits

24e579c8898aa641 ("bnx2x: fix napi poll return value for repoll") 
f104fedc0da126ab ("enic: fix rx napi poll return value")

for context.