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Date: Thu, 19 Nov 2020 16:27:01 +0800
From: kernel test robot <rong.a.chen@...el.com>
To: Mat Martineau <mathew.j.martineau@...ux.intel.com>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
Paolo Abeni <pabeni@...hat.com>,
Peter Krystad <peter.krystad@...ux.intel.com>,
Florian Westphal <fw@...len.de>,
Christoph Paasch <cpaasch@...le.com>
Subject: net/mptcp/options.c:203:3: warning: Assignment of function parameter
has no effect outside the function.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: c2e7554e1b85935d962127efa3c2a76483b0b3b6
commit: 6d0060f600adfddaa43fefb96b6b12643331961e mptcp: Write MPTCP DSS headers to outgoing data packets
compiler: h8300-linux-gcc (GCC) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <rong.a.chen@...el.com>
cppcheck possible warnings: (new ones prefixed by >>, may not real problems)
net/mptcp/options.c:57:4: warning: Assignment of function parameter has no effect outside the function. Did you forget dereferencing it? [uselessAssignmentPtrArg]
ptr += 8;
^
>> net/mptcp/options.c:203:3: warning: Assignment of function parameter has no effect outside the function. [uselessAssignmentArg]
remaining -= map_size;
^
net/mptcp/options.c:257:2: warning: Assignment of function parameter has no effect outside the function. [uselessAssignmentArg]
remaining -= opt_size;
^
vim +203 net/mptcp/options.c
6d0060f600adfdd Mat Martineau 2020-01-21 177
6d0060f600adfdd Mat Martineau 2020-01-21 178 static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
6d0060f600adfdd Mat Martineau 2020-01-21 179 unsigned int *size,
6d0060f600adfdd Mat Martineau 2020-01-21 180 unsigned int remaining,
6d0060f600adfdd Mat Martineau 2020-01-21 181 struct mptcp_out_options *opts)
6d0060f600adfdd Mat Martineau 2020-01-21 182 {
6d0060f600adfdd Mat Martineau 2020-01-21 183 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
6d0060f600adfdd Mat Martineau 2020-01-21 184 unsigned int dss_size = 0;
6d0060f600adfdd Mat Martineau 2020-01-21 185 struct mptcp_ext *mpext;
6d0060f600adfdd Mat Martineau 2020-01-21 186 struct mptcp_sock *msk;
6d0060f600adfdd Mat Martineau 2020-01-21 187 unsigned int ack_size;
6d0060f600adfdd Mat Martineau 2020-01-21 188 u8 tcp_fin;
6d0060f600adfdd Mat Martineau 2020-01-21 189
6d0060f600adfdd Mat Martineau 2020-01-21 190 if (skb) {
6d0060f600adfdd Mat Martineau 2020-01-21 191 mpext = mptcp_get_ext(skb);
6d0060f600adfdd Mat Martineau 2020-01-21 192 tcp_fin = TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN;
6d0060f600adfdd Mat Martineau 2020-01-21 193 } else {
6d0060f600adfdd Mat Martineau 2020-01-21 194 mpext = NULL;
6d0060f600adfdd Mat Martineau 2020-01-21 195 tcp_fin = 0;
6d0060f600adfdd Mat Martineau 2020-01-21 196 }
6d0060f600adfdd Mat Martineau 2020-01-21 197
6d0060f600adfdd Mat Martineau 2020-01-21 198 if (!skb || (mpext && mpext->use_map) || tcp_fin) {
6d0060f600adfdd Mat Martineau 2020-01-21 199 unsigned int map_size;
6d0060f600adfdd Mat Martineau 2020-01-21 200
6d0060f600adfdd Mat Martineau 2020-01-21 201 map_size = TCPOLEN_MPTCP_DSS_BASE + TCPOLEN_MPTCP_DSS_MAP64;
6d0060f600adfdd Mat Martineau 2020-01-21 202
6d0060f600adfdd Mat Martineau 2020-01-21 @203 remaining -= map_size;
6d0060f600adfdd Mat Martineau 2020-01-21 204 dss_size = map_size;
6d0060f600adfdd Mat Martineau 2020-01-21 205 if (mpext)
6d0060f600adfdd Mat Martineau 2020-01-21 206 opts->ext_copy = *mpext;
6d0060f600adfdd Mat Martineau 2020-01-21 207
6d0060f600adfdd Mat Martineau 2020-01-21 208 if (skb && tcp_fin &&
6d0060f600adfdd Mat Martineau 2020-01-21 209 subflow->conn->sk_state != TCP_ESTABLISHED)
6d0060f600adfdd Mat Martineau 2020-01-21 210 mptcp_write_data_fin(subflow, &opts->ext_copy);
6d0060f600adfdd Mat Martineau 2020-01-21 211 }
6d0060f600adfdd Mat Martineau 2020-01-21 212
6d0060f600adfdd Mat Martineau 2020-01-21 213 ack_size = TCPOLEN_MPTCP_DSS_ACK64;
6d0060f600adfdd Mat Martineau 2020-01-21 214
6d0060f600adfdd Mat Martineau 2020-01-21 215 /* Add kind/length/subtype/flag overhead if mapping is not populated */
6d0060f600adfdd Mat Martineau 2020-01-21 216 if (dss_size == 0)
6d0060f600adfdd Mat Martineau 2020-01-21 217 ack_size += TCPOLEN_MPTCP_DSS_BASE;
6d0060f600adfdd Mat Martineau 2020-01-21 218
6d0060f600adfdd Mat Martineau 2020-01-21 219 dss_size += ack_size;
6d0060f600adfdd Mat Martineau 2020-01-21 220
6d0060f600adfdd Mat Martineau 2020-01-21 221 msk = mptcp_sk(mptcp_subflow_ctx(sk)->conn);
6d0060f600adfdd Mat Martineau 2020-01-21 222 if (msk) {
6d0060f600adfdd Mat Martineau 2020-01-21 223 opts->ext_copy.data_ack = msk->ack_seq;
6d0060f600adfdd Mat Martineau 2020-01-21 224 } else {
6d0060f600adfdd Mat Martineau 2020-01-21 225 mptcp_crypto_key_sha(mptcp_subflow_ctx(sk)->remote_key,
6d0060f600adfdd Mat Martineau 2020-01-21 226 NULL, &opts->ext_copy.data_ack);
6d0060f600adfdd Mat Martineau 2020-01-21 227 opts->ext_copy.data_ack++;
6d0060f600adfdd Mat Martineau 2020-01-21 228 }
6d0060f600adfdd Mat Martineau 2020-01-21 229
6d0060f600adfdd Mat Martineau 2020-01-21 230 opts->ext_copy.ack64 = 1;
6d0060f600adfdd Mat Martineau 2020-01-21 231 opts->ext_copy.use_ack = 1;
6d0060f600adfdd Mat Martineau 2020-01-21 232
6d0060f600adfdd Mat Martineau 2020-01-21 233 *size = ALIGN(dss_size, 4);
6d0060f600adfdd Mat Martineau 2020-01-21 234 return true;
6d0060f600adfdd Mat Martineau 2020-01-21 235 }
6d0060f600adfdd Mat Martineau 2020-01-21 236
---
0-DAY CI Kernel Test Service, Intel Corporation
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