Hi Dmitry, [auto build test WARNING on hid/for-next] [also build test WARNING on v4.12-rc3 next-20170531] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Dmitry-Torokhov/HID-Consolidate-serializing-ope-close-in-transport-drivers/20170601-092350 base: https://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid.git for-next config: x86_64-randconfig-x016-201722 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): drivers/hid/usbhid/hiddev.c: In function 'hiddev_open': >> drivers/hid/usbhid/hiddev.c:309:4: warning: ignoring return value of 'hid_hw_open', declared with attribute warn_unused_result [-Wunused-result] hid_hw_open(hid); ^~~~~~~~~~~~~~~~ vim +/hid_hw_open +309 drivers/hid/usbhid/hiddev.c 293 goto bail; 294 } 295 296 spin_lock_irq(&list->hiddev->list_lock); 297 list_add_tail(&list->node, &hiddev->list); 298 spin_unlock_irq(&list->hiddev->list_lock); 299 300 mutex_lock(&hiddev->existancelock); 301 if (!list->hiddev->open++) 302 if (list->hiddev->exist) { 303 struct hid_device *hid = hiddev->hid; 304 res = usbhid_get_power(hid); 305 if (res < 0) { 306 res = -EIO; 307 goto bail_unlock; 308 } > 309 hid_hw_open(hid); 310 } 311 mutex_unlock(&hiddev->existancelock); 312 return 0; 313 bail_unlock: 314 mutex_unlock(&hiddev->existancelock); 315 bail: 316 file->private_data = NULL; 317 vfree(list); --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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