Hi Sathish, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on bluetooth-next/master] [also build test WARNING on v5.4-rc7 next-20191112] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Sathish-Narsimman/Bluetooth-btus... base: https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git master config: ia64-allmodconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=ia64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers//bluetooth/btusb.c: In function 'btusb_work': err = usb_set_interface(data->udev, data->isoc_ifnum, altsetting); ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers//bluetooth/btusb.c:1630:6: note: 'new_alts' was declared here int new_alts; ^~~~~~~~ vim +/new_alts +1534 drivers//bluetooth/btusb.c 5e23b923da03de Marcel Holtmann 2007-10-20 1523 42b16b3fbb5ee4 Jesper Juhl 2011-01-17 1524 static inline int __set_isoc_interface(struct hci_dev *hdev, int altsetting) 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1525 { 155961e8001719 David Herrmann 2012-02-09 1526 struct btusb_data *data = hci_get_drvdata(hdev); 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1527 struct usb_interface *intf = data->isoc; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1528 struct usb_endpoint_descriptor *ep_desc; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1529 int i, err; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1530 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1531 if (!data->isoc) 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1532 return -ENODEV; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1533 459232fc0e2505 Marcel Holtmann 2017-10-24 @1534 err = usb_set_interface(data->udev, data->isoc_ifnum, altsetting); 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1535 if (err < 0) { 2064ee332e4c1b Marcel Holtmann 2017-10-30 1536 bt_dev_err(hdev, "setting interface failed (%d)", -err); 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1537 return err; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1538 } 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1539 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1540 data->isoc_altsetting = altsetting; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1541 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1542 data->isoc_tx_ep = NULL; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1543 data->isoc_rx_ep = NULL; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1544 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1545 for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) { 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1546 ep_desc = &intf->cur_altsetting->endpoint[i].desc; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1547 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1548 if (!data->isoc_tx_ep && usb_endpoint_is_isoc_out(ep_desc)) { 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1549 data->isoc_tx_ep = ep_desc; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1550 continue; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1551 } 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1552 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1553 if (!data->isoc_rx_ep && usb_endpoint_is_isoc_in(ep_desc)) { 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1554 data->isoc_rx_ep = ep_desc; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1555 continue; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1556 } 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1557 } 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1558 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1559 if (!data->isoc_tx_ep || !data->isoc_rx_ep) { 2064ee332e4c1b Marcel Holtmann 2017-10-30 1560 bt_dev_err(hdev, "invalid SCO descriptors"); 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1561 return -ENODEV; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1562 } 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1563 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1564 return 0; 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1565 } 9bfa35fe422c74 Marcel Holtmann 2008-08-18 1566 :::::: The code at line 1534 was first introduced by commit :::::: 459232fc0e2505d489e2dc3befc1ad01dcdccb47 Bluetooth: btusb: Fix isochronous interface assignments :::::: TO: Marcel Holtmann <marcel(a)holtmann.org&gt; :::::: CC: Johan Hedberg <johan.hedberg(a)intel.com&gt; --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation