linux-kernel - net/core/dev.c:4508:19-26: ERROR: PTR_ERR applied after initialization to constant on line 4452

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Date:   Sun, 9 Apr 2017 13:40:04 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: net/core/dev.c:4508:19-26: ERROR: PTR_ERR applied after
 initialization to constant on line 4452

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   78d91a75b40fcf6a08506d308abf2413a29b7e30
commit: 25393d3fc055b76587fcc91627aee8c345400c3a net: Prepare gro for packet consuming gro callbacks
date:   8 weeks ago


coccinelle warnings: (new ones prefixed by >>)

>> net/core/dev.c:4508:19-26: ERROR: PTR_ERR applied after initialization to constant on line 4452

vim +4508 net/core/dev.c

  4446				--pinfo->nr_frags * sizeof(pinfo->frags[0]));
  4447		}
  4448	}
  4449	
  4450	static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
  4451	{
> 4452		struct sk_buff **pp = NULL;
  4453		struct packet_offload *ptype;
  4454		__be16 type = skb->protocol;
  4455		struct list_head *head = &offload_base;
  4456		int same_flow;
  4457		enum gro_result ret;
  4458		int grow;
  4459	
  4460		if (!(skb->dev->features & NETIF_F_GRO))
  4461			goto normal;
  4462	
  4463		if (skb->csum_bad)
  4464			goto normal;
  4465	
  4466		gro_list_prepare(napi, skb);
  4467	
  4468		rcu_read_lock();
  4469		list_for_each_entry_rcu(ptype, head, list) {
  4470			if (ptype->type != type || !ptype->callbacks.gro_receive)
  4471				continue;
  4472	
  4473			skb_set_network_header(skb, skb_gro_offset(skb));
  4474			skb_reset_mac_len(skb);
  4475			NAPI_GRO_CB(skb)->same_flow = 0;
  4476			NAPI_GRO_CB(skb)->flush = skb_is_gso(skb) || skb_has_frag_list(skb);
  4477			NAPI_GRO_CB(skb)->free = 0;
  4478			NAPI_GRO_CB(skb)->encap_mark = 0;
  4479			NAPI_GRO_CB(skb)->recursion_counter = 0;
  4480			NAPI_GRO_CB(skb)->is_fou = 0;
  4481			NAPI_GRO_CB(skb)->is_atomic = 1;
  4482			NAPI_GRO_CB(skb)->gro_remcsum_start = 0;
  4483	
  4484			/* Setup for GRO checksum validation */
  4485			switch (skb->ip_summed) {
  4486			case CHECKSUM_COMPLETE:
  4487				NAPI_GRO_CB(skb)->csum = skb->csum;
  4488				NAPI_GRO_CB(skb)->csum_valid = 1;
  4489				NAPI_GRO_CB(skb)->csum_cnt = 0;
  4490				break;
  4491			case CHECKSUM_UNNECESSARY:
  4492				NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1;
  4493				NAPI_GRO_CB(skb)->csum_valid = 0;
  4494				break;
  4495			default:
  4496				NAPI_GRO_CB(skb)->csum_cnt = 0;
  4497				NAPI_GRO_CB(skb)->csum_valid = 0;
  4498			}
  4499	
  4500			pp = ptype->callbacks.gro_receive(&napi->gro_list, skb);
  4501			break;
  4502		}
  4503		rcu_read_unlock();
  4504	
  4505		if (&ptype->list == head)
  4506			goto normal;
  4507	
> 4508		if (IS_ERR(pp) && PTR_ERR(pp) == -EINPROGRESS) {
  4509			ret = GRO_CONSUMED;
  4510			goto ok;
  4511		}

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