Hi YueHaibing, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on mkp-scsi/for-next] [also build test WARNING on scsi/for-next v5.9-rc1 next-20200818] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/YueHaibing/scsi-libfc-Fix-passing-zero-to-PTR_ERR-warning/20200818-194521 base: https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next config: x86_64-randconfig-a002-20200818 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 790878f291fa5dc58a1c560cb6cc76fd1bfd1c5a) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/scsi/libfc/fc_disc.c:365:6: warning: variable 'err' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] if (lport->tt.elsct_send(lport, 0, fp, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/scsi/libfc/fc_disc.c:371:30: note: uninitialized use occurs here fc_disc_error(disc, ERR_PTR(err)); ^~~ drivers/scsi/libfc/fc_disc.c:365:2: note: remove the 'if' if its condition is always true if (lport->tt.elsct_send(lport, 0, fp, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/scsi/libfc/fc_disc.c:346:9: note: initialize the variable 'err' to silence this warning int err; ^ = 0 1 warning generated. # https://github.com/0day-ci/linux/commit/c22a185df6f9701ac244e7f2ec1ba38e27177aec git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review YueHaibing/scsi-libfc-Fix-passing-zero-to-PTR_ERR-warning/20200818-194521 git checkout c22a185df6f9701ac244e7f2ec1ba38e27177aec vim +365 drivers/scsi/libfc/fc_disc.c 42e9a92fe6a909 Robert Love 2008-12-09 337 42e9a92fe6a909 Robert Love 2008-12-09 338 /** 34f42a070fc98f Robert Love 2009-02-27 339 * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request b1987c884585a6 Lee Jones 2020-07-07 340 * @disc: The discovery context 42e9a92fe6a909 Robert Love 2008-12-09 341 */ 42e9a92fe6a909 Robert Love 2008-12-09 342 static void fc_disc_gpn_ft_req(struct fc_disc *disc) 42e9a92fe6a909 Robert Love 2008-12-09 343 { 42e9a92fe6a909 Robert Love 2008-12-09 344 struct fc_frame *fp; 0685230c59b548 Joe Eykholt 2010-07-20 345 struct fc_lport *lport = fc_disc_lport(disc); c22a185df6f970 YueHaibing 2020-08-18 346 int err; 42e9a92fe6a909 Robert Love 2008-12-09 347 ee35624e1e4e4e Hannes Reinecke 2018-07-04 348 lockdep_assert_held(&disc->disc_mutex); ee35624e1e4e4e Hannes Reinecke 2018-07-04 349 42e9a92fe6a909 Robert Love 2008-12-09 350 WARN_ON(!fc_lport_test_ready(lport)); 42e9a92fe6a909 Robert Love 2008-12-09 351 42e9a92fe6a909 Robert Love 2008-12-09 352 disc->pending = 1; 42e9a92fe6a909 Robert Love 2008-12-09 353 disc->requested = 0; 42e9a92fe6a909 Robert Love 2008-12-09 354 42e9a92fe6a909 Robert Love 2008-12-09 355 disc->buf_len = 0; 42e9a92fe6a909 Robert Love 2008-12-09 356 disc->seq_count = 0; 42e9a92fe6a909 Robert Love 2008-12-09 357 fp = fc_frame_alloc(lport, 42e9a92fe6a909 Robert Love 2008-12-09 358 sizeof(struct fc_ct_hdr) + 42e9a92fe6a909 Robert Love 2008-12-09 359 sizeof(struct fc_ns_gid_ft)); c22a185df6f970 YueHaibing 2020-08-18 360 if (!fp) { c22a185df6f970 YueHaibing 2020-08-18 361 err = -ENOMEM; 42e9a92fe6a909 Robert Love 2008-12-09 362 goto err; c22a185df6f970 YueHaibing 2020-08-18 363 } 42e9a92fe6a909 Robert Love 2008-12-09 364 a46f327aa5caf2 Joe Eykholt 2009-08-25 @365 if (lport->tt.elsct_send(lport, 0, fp, 42e9a92fe6a909 Robert Love 2008-12-09 366 FC_NS_GPN_FT, 42e9a92fe6a909 Robert Love 2008-12-09 367 fc_disc_gpn_ft_resp, b94f8951bf2566 Joe Eykholt 2009-11-03 368 disc, 3 * lport->r_a_tov)) 42e9a92fe6a909 Robert Love 2008-12-09 369 return; 42e9a92fe6a909 Robert Love 2008-12-09 370 err: c22a185df6f970 YueHaibing 2020-08-18 371 fc_disc_error(disc, ERR_PTR(err)); 42e9a92fe6a909 Robert Love 2008-12-09 372 } 42e9a92fe6a909 Robert Love 2008-12-09 373 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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