Hi Xin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Xin-Long/sctp-Implement-RFC6951-UDP-Encapsulation-of-SCTP/20201008-175211
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 9faebeb2d80065926dfbc09cb73b1bb7779a89cd
config: i386-randconfig-s002-20201008 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-218-gc0e96d6d-dirty
        # https://github.com/0day-ci/linux/commit/5f37023ae66b1c3df726e16ec30b9443394e1ed3
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Xin-Long/sctp-Implement-RFC6951-UDP-Encapsulation-of-SCTP/20201008-175211
        git checkout 5f37023ae66b1c3df726e16ec30b9443394e1ed3
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

echo
echo "sparse warnings: (new ones prefixed by >>)"
echo
   net/sctp/socket.c: note: in included file (through include/net/sctp/sctp.h):
   include/net/sctp/structs.h:333:41: sparse: sparse: array of flexible structures
>> net/sctp/socket.c:4439:31: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted __be16 [usertype] encap_port @@     got unsigned short [usertype] sue_port @@
>> net/sctp/socket.c:4439:31: sparse:     expected restricted __be16 [usertype] encap_port
>> net/sctp/socket.c:4439:31: sparse:     got unsigned short [usertype] sue_port
   net/sctp/socket.c:4458:39: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted __be16 [usertype] encap_port @@     got unsigned short [usertype] sue_port @@
   net/sctp/socket.c:4458:39: sparse:     expected restricted __be16 [usertype] encap_port
   net/sctp/socket.c:4458:39: sparse:     got unsigned short [usertype] sue_port
   net/sctp/socket.c:4463:33: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted __be16 [usertype] encap_port @@     got unsigned short [usertype] sue_port @@
   net/sctp/socket.c:4463:33: sparse:     expected restricted __be16 [usertype] encap_port
   net/sctp/socket.c:4463:33: sparse:     got unsigned short [usertype] sue_port
>> net/sctp/socket.c:7869:32: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned short [addressable] [usertype] sue_port @@     got restricted __be16 [usertype] encap_port @@
>> net/sctp/socket.c:7869:32: sparse:     expected unsigned short [addressable] [usertype] sue_port
>> net/sctp/socket.c:7869:32: sparse:     got restricted __be16 [usertype] encap_port
   net/sctp/socket.c:7885:32: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned short [addressable] [usertype] sue_port @@     got restricted __be16 [usertype] encap_port @@
   net/sctp/socket.c:7885:32: sparse:     expected unsigned short [addressable] [usertype] sue_port
   net/sctp/socket.c:7885:32: sparse:     got restricted __be16 [usertype] encap_port
   net/sctp/socket.c:7889:24: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned short [addressable] [usertype] sue_port @@     got restricted __be16 [usertype] encap_port @@
   net/sctp/socket.c:7889:24: sparse:     expected unsigned short [addressable] [usertype] sue_port
   net/sctp/socket.c:7889:24: sparse:     got restricted __be16 [usertype] encap_port
   net/sctp/socket.c:8320:23: sparse: sparse: context imbalance in 'sctp_get_port_local' - unexpected unlock

vim +4439 net/sctp/socket.c

  4419	
  4420	static int sctp_setsockopt_encap_port(struct sock *sk,
  4421					      struct sctp_udpencaps *encap,
  4422					      unsigned int optlen)
  4423	{
  4424		struct sctp_association *asoc;
  4425		struct sctp_transport *t;
  4426	
  4427		if (optlen != sizeof(*encap))
  4428			return -EINVAL;
  4429	
  4430		/* If an address other than INADDR_ANY is specified, and
  4431		 * no transport is found, then the request is invalid.
  4432		 */
  4433		if (!sctp_is_any(sk, (union sctp_addr *)&encap->sue_address)) {
  4434			t = sctp_addr_id2transport(sk, &encap->sue_address,
  4435						   encap->sue_assoc_id);
  4436			if (!t)
  4437				return -EINVAL;
  4438	
> 4439			t->encap_port = encap->sue_port;
  4440			return 0;
  4441		}
  4442	
  4443		/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
  4444		 * socket is a one to many style socket, and an association
  4445		 * was not found, then the id was invalid.
  4446		 */
  4447		asoc = sctp_id2assoc(sk, encap->sue_assoc_id);
  4448		if (!asoc && encap->sue_assoc_id != SCTP_FUTURE_ASSOC &&
  4449		    sctp_style(sk, UDP))
  4450			return -EINVAL;
  4451	
  4452		/* If changes are for association, also apply encap to each
  4453		 * transport.
  4454		 */
  4455		if (asoc) {
  4456			list_for_each_entry(t, &asoc->peer.transport_addr_list,
  4457					    transports)
  4458				t->encap_port = encap->sue_port;
  4459	
  4460			return 0;
  4461		}
  4462	
  4463		sctp_sk(sk)->encap_port = encap->sue_port;
  4464		return 0;
  4465	}
  4466	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org