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-passin... base: https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next config: x86_64-randconfig-m001-20200818 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; New smatch warnings: drivers/scsi/libfc/fc_disc.c:371 fc_disc_gpn_ft_req() error: uninitialized symbol 'err'. # https://github.com/0day-ci/linux/commit/c22a185df6f9701ac244e7f2ec1ba38e2... 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 +/err +371 drivers/scsi/libfc/fc_disc.c 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; It's Reverse the Last Condition anti-pattern. It's a special subcase of Success Handling anti-pattern. Ugh... Anyway if tt.elsct_send() returns NULL then "err" isn't initialized. 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 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org