The return on line 1465 is missing a mutex_unlock on &bitmap_lock. julia ---------- Forwarded message ---------- Date: Tue, 8 Feb 2022 18:55:12 +0800 From: kernel test robot <lkp(a)intel.com&gt; To: kbuild(a)lists.01.org Cc: lkp(a)intel.com, Julia Lawall <julia.lawall(a)lip6.fr&gt; Subject: [xilinx-xlnx:xlnx_rebase_v5.15 304/872] drivers/tty/serial/xilinx_uartps.c:1465:3-9: preceding lock on line 1458 CC: kbuild-all(a)lists.01.org CC: linux-arm-kernel(a)lists.infradead.org TO: Michal Simek <monstr(a)monstr.eu&gt; CC: Shubhrajyoti Datta <shubhrajyoti.datta(a)xilinx.com&gt; CC: Radhey Shyam Pandey <radhey.shyam.pandey(a)xilinx.com&gt; tree: https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.15 head: 1183ce490adb103e5e569b8ebd74c50c885ddc05 commit: f0090478ae8a76b733a846f50dc5559fff3c461f [304/872] serial: uartps: Change uart ID port allocation :::::: branch date: 7 days ago :::::: commit date: 8 days ago config: xtensa-randconfig-c004-20220207 (https://download.01.org/0day-ci/archive/20220208/202202081830.Tk4vrixD-lk...) compiler: xtensa-linux-gcc (GCC) 11.2.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Julia Lawall <julia.lawall(a)lip6.fr&gt; cocci warnings: (new ones prefixed by >>) vim +1465 drivers/tty/serial/xilinx_uartps.c f0090478ae8a76 Michal Simek 2018-09-20 1453 f0090478ae8a76 Michal Simek 2018-09-20 1454 static int cdns_get_id(struct platform_device *pdev) f0090478ae8a76 Michal Simek 2018-09-20 1455 { f0090478ae8a76 Michal Simek 2018-09-20 1456 int id, ret; f0090478ae8a76 Michal Simek 2018-09-20 1457 f0090478ae8a76 Michal Simek 2018-09-20 @1458 mutex_lock(&bitmap_lock); f0090478ae8a76 Michal Simek 2018-09-20 1459 f0090478ae8a76 Michal Simek 2018-09-20 1460 /* Alias list is stable that's why get alias bitmap only once */ f0090478ae8a76 Michal Simek 2018-09-20 1461 if (!alias_bitmap_initialized) { f0090478ae8a76 Michal Simek 2018-09-20 1462 ret = of_alias_get_alias_list(cdns_uart_of_match, "serial", f0090478ae8a76 Michal Simek 2018-09-20 1463 alias_bitmap, CDNS_UART_NR_PORTS); f0090478ae8a76 Michal Simek 2018-09-20 1464 if (ret) f0090478ae8a76 Michal Simek 2018-09-20 @1465 return ret; f0090478ae8a76 Michal Simek 2018-09-20 1466 f0090478ae8a76 Michal Simek 2018-09-20 1467 alias_bitmap_initialized++; f0090478ae8a76 Michal Simek 2018-09-20 1468 } f0090478ae8a76 Michal Simek 2018-09-20 1469 f0090478ae8a76 Michal Simek 2018-09-20 1470 /* Make sure that alias ID is not taken by instance without alias */ f0090478ae8a76 Michal Simek 2018-09-20 1471 bitmap_or(bitmap, bitmap, alias_bitmap, CDNS_UART_NR_PORTS); f0090478ae8a76 Michal Simek 2018-09-20 1472 f0090478ae8a76 Michal Simek 2018-09-20 1473 dev_dbg(&pdev->dev, "Alias bitmap: %*pb\n", f0090478ae8a76 Michal Simek 2018-09-20 1474 CDNS_UART_NR_PORTS, bitmap); f0090478ae8a76 Michal Simek 2018-09-20 1475 f0090478ae8a76 Michal Simek 2018-09-20 1476 /* Look for a serialN alias */ f0090478ae8a76 Michal Simek 2018-09-20 1477 id = of_alias_get_id(pdev->dev.of_node, "serial"); f0090478ae8a76 Michal Simek 2018-09-20 1478 if (id < 0) { f0090478ae8a76 Michal Simek 2018-09-20 1479 dev_warn(&pdev->dev, f0090478ae8a76 Michal Simek 2018-09-20 1480 "No serial alias passed. Using the first free id\n"); f0090478ae8a76 Michal Simek 2018-09-20 1481 f0090478ae8a76 Michal Simek 2018-09-20 1482 /* f0090478ae8a76 Michal Simek 2018-09-20 1483 * Start with id 0 and check if there is no serial0 alias f0090478ae8a76 Michal Simek 2018-09-20 1484 * which points to device which is compatible with this driver. f0090478ae8a76 Michal Simek 2018-09-20 1485 * If alias exists then try next free position. f0090478ae8a76 Michal Simek 2018-09-20 1486 */ f0090478ae8a76 Michal Simek 2018-09-20 1487 id = 0; f0090478ae8a76 Michal Simek 2018-09-20 1488 f0090478ae8a76 Michal Simek 2018-09-20 1489 for (;;) { f0090478ae8a76 Michal Simek 2018-09-20 1490 dev_info(&pdev->dev, "Checking id %d\n", id); f0090478ae8a76 Michal Simek 2018-09-20 1491 id = find_next_zero_bit(bitmap, CDNS_UART_NR_PORTS, id); f0090478ae8a76 Michal Simek 2018-09-20 1492 f0090478ae8a76 Michal Simek 2018-09-20 1493 /* No free empty instance */ f0090478ae8a76 Michal Simek 2018-09-20 1494 if (id == CDNS_UART_NR_PORTS) { f0090478ae8a76 Michal Simek 2018-09-20 1495 dev_err(&pdev->dev, "No free ID\n"); f0090478ae8a76 Michal Simek 2018-09-20 1496 mutex_unlock(&bitmap_lock); f0090478ae8a76 Michal Simek 2018-09-20 1497 return -EINVAL; f0090478ae8a76 Michal Simek 2018-09-20 1498 } f0090478ae8a76 Michal Simek 2018-09-20 1499 f0090478ae8a76 Michal Simek 2018-09-20 1500 dev_dbg(&pdev->dev, "The empty id is %d\n", id); f0090478ae8a76 Michal Simek 2018-09-20 1501 /* Check if ID is empty */ f0090478ae8a76 Michal Simek 2018-09-20 1502 if (!test_and_set_bit(id, bitmap)) { f0090478ae8a76 Michal Simek 2018-09-20 1503 /* Break the loop if bit is taken */ f0090478ae8a76 Michal Simek 2018-09-20 1504 dev_dbg(&pdev->dev, f0090478ae8a76 Michal Simek 2018-09-20 1505 "Selected ID %d allocation passed\n", f0090478ae8a76 Michal Simek 2018-09-20 1506 id); f0090478ae8a76 Michal Simek 2018-09-20 1507 break; f0090478ae8a76 Michal Simek 2018-09-20 1508 } f0090478ae8a76 Michal Simek 2018-09-20 1509 dev_dbg(&pdev->dev, f0090478ae8a76 Michal Simek 2018-09-20 1510 "Selected ID %d allocation failed\n", id); f0090478ae8a76 Michal Simek 2018-09-20 1511 /* if taking bit fails then try next one */ f0090478ae8a76 Michal Simek 2018-09-20 1512 id++; f0090478ae8a76 Michal Simek 2018-09-20 1513 } f0090478ae8a76 Michal Simek 2018-09-20 1514 } f0090478ae8a76 Michal Simek 2018-09-20 1515 f0090478ae8a76 Michal Simek 2018-09-20 1516 mutex_unlock(&bitmap_lock); f0090478ae8a76 Michal Simek 2018-09-20 1517 f0090478ae8a76 Michal Simek 2018-09-20 1518 return id; f0090478ae8a76 Michal Simek 2018-09-20 1519 } f0090478ae8a76 Michal Simek 2018-09-20 1520 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org