Hi Lizhi, kernel test robot noticed the following build warnings: [auto build test WARNING on next-20250207] url: https://github.com/intel-lab-lkp/linux/commits/Lizhi-Xu/Bluetooth-l2cap-protect-conn-refcnt-under-hci-dev-lock/20250207-221142 base: next-20250207 patch link: https://lore.kernel.org/r/20250207140216.3076952-1-lizhi.xu%40windriver.com patch subject: [PATCH next] Bluetooth: l2cap: protect conn refcnt under hci dev lock config: i386-buildonly-randconfig-001-20250208 (https://download.01.org/0day-ci/archive/20250208/202502081633.z7O9VFNy-lkp@xxxxxxxxx/config) compiler: gcc-11 (Debian 11.3.0-12) 11.3.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250208/202502081633.z7O9VFNy-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202502081633.z7O9VFNy-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> net/bluetooth/l2cap_core.c:7477:27: warning: 'l2cap_conn_hold_unless_zero' defined but not used [-Wunused-function] 7477 | static struct l2cap_conn *l2cap_conn_hold_unless_zero(struct l2cap_conn *c) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/l2cap_conn_hold_unless_zero +7477 net/bluetooth/l2cap_core.c 4d7ea8ee90e42f Luiz Augusto von Dentz 2021-01-13 7476 6ab54a71718943 Luiz Augusto von Dentz 2025-01-16 @7477 static struct l2cap_conn *l2cap_conn_hold_unless_zero(struct l2cap_conn *c) 6ab54a71718943 Luiz Augusto von Dentz 2025-01-16 7478 { 6ab54a71718943 Luiz Augusto von Dentz 2025-01-16 7479 BT_DBG("conn %p orig refcnt %u", c, kref_read(&c->ref)); 6ab54a71718943 Luiz Augusto von Dentz 2025-01-16 7480 6ab54a71718943 Luiz Augusto von Dentz 2025-01-16 7481 if (!kref_get_unless_zero(&c->ref)) 6ab54a71718943 Luiz Augusto von Dentz 2025-01-16 7482 return NULL; 6ab54a71718943 Luiz Augusto von Dentz 2025-01-16 7483 6ab54a71718943 Luiz Augusto von Dentz 2025-01-16 7484 return c; 6ab54a71718943 Luiz Augusto von Dentz 2025-01-16 7485 } 6ab54a71718943 Luiz Augusto von Dentz 2025-01-16 7486 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
