tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-4.4 head: 6d5e8cb22c2a82dde051b99b44498bbc350c7130 commit: 210799dfa9aea12c2d02acb3bec06676cfabef96 [9/11] CHROMIUM: drm/evdi: Use free platform device again after its parent was removed config: xtensa-allyesconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 7.5.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel git fetch --no-tags chrome-os chromeos-4.4 git checkout 210799dfa9aea12c2d02acb3bec06676cfabef96 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross ARCH=xtensa If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): cc1: warning: include/drm: No such file or directory [-Wmissing-include-dirs] In file included from include/uapi/linux/stddef.h:1:0, from include/linux/stddef.h:4, from include/uapi/linux/posix_types.h:4, from include/uapi/linux/types.h:13, from include/linux/types.h:5, from include/linux/list.h:4, from include/linux/agp_backend.h:33, from include/drm/drmP.h:35, from drivers/gpu/drm/evdi/evdi_drv.c:10: include/linux/scatterlist.h: In function 'sg_set_buf': arch/xtensa/include/asm/page.h:175:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits] ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) ^ include/linux/compiler.h:182:42: note: in definition of macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ include/linux/scatterlist.h:140:2: note: in expansion of macro 'BUG_ON' BUG_ON(!virt_addr_valid(buf)); ^~~~~~ arch/xtensa/include/asm/page.h:183:32: note: in expansion of macro 'pfn_valid' #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) ^~~~~~~~~ include/linux/scatterlist.h:140:10: note: in expansion of macro 'virt_addr_valid' BUG_ON(!virt_addr_valid(buf)); ^~~~~~~~~~~~~~~ In file included from drivers/gpu/drm/evdi/evdi_drv.h:23:0, from drivers/gpu/drm/evdi/evdi_drv.c:17: include/linux/reservation.h: In function 'reservation_object_fini': include/linux/reservation.h:122:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < fobj->shared_count; ++i) ^ drivers/gpu/drm/evdi/evdi_drv.c: At top level: bool evdi_platform_device_is_free(struct platform_device *pdev) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/evdi/evdi_drv.c: In function 'add_device_with_usb_path': drivers/gpu/drm/evdi/evdi_drv.c:303:8: warning: variable 'itf_token' set but not used [-Wunused-but-set-variable] char *itf_token = NULL; ^~~~~~~~~ drivers/gpu/drm/evdi/evdi_drv.c: In function 'evdi_init': drivers/gpu/drm/evdi/evdi_drv.c:491:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < ARRAY_SIZE(evdi_device_attributes); i++) { ^ drivers/gpu/drm/evdi/evdi_drv.c: In function 'evdi_exit': drivers/gpu/drm/evdi/evdi_drv.c:510:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < ARRAY_SIZE(evdi_device_attributes); i++) { ^ vim +/evdi_platform_device_is_free +72 drivers/gpu/drm/evdi/evdi_drv.c 16 18 #include <uapi/drm/evdi_drm.h> 19 #include "evdi_debug.h" 20 21 MODULE_AUTHOR("DisplayLink (UK) Ltd."); 22 MODULE_DESCRIPTION("Extensible Virtual Display Interface"); 23 MODULE_LICENSE("GPL"); 24 25 #define EVDI_DEVICE_COUNT_MAX 16 26 #define MAX_EVDI_USB_ADDR 10 27 28 static struct evdi_context { 29 struct device *root_dev; 30 unsigned int dev_count; 31 struct platform_device *devices[EVDI_DEVICE_COUNT_MAX]; 32 struct notifier_block usb_notifier; 33 } evdi_context; 34 35 static int evdi_platform_drv_usb(__always_unused struct notifier_block *nb, 36 unsigned long action, 37 void *data) 38 { 39 struct usb_device *usb_dev = (struct usb_device *)(data); 40 struct platform_device *pdev; 41 int i = 0; 42 43 if (!usb_dev) 44 return 0; 45 if (action != BUS_NOTIFY_DEL_DEVICE) 46 return 0; 47 48 for (i = 0; i < EVDI_DEVICE_COUNT_MAX; ++i) { 49 pdev = evdi_context.devices[i]; 50 if (pdev && pdev->dev.parent == &usb_dev->dev) { 51 EVDI_INFO("Parent USB removed. Removing evdi.%d\n", i); 52 platform_device_unregister(pdev); 53 evdi_context.dev_count--; 54 evdi_context.devices[i] = NULL; 55 } 56 } 57 58 return 0; 59 } 60 61 static int evdi_context_get_free_idx(struct evdi_context *ctx) 62 { 63 int i; 64 65 for (i = 0; i < EVDI_DEVICE_COUNT_MAX; ++i) { 66 if (ctx->devices[i] == NULL) 67 return i; 68 } 69 return -ENOMEM; 70 } 71 73 { 74 struct drm_device *drm_dev = 75 (struct drm_device *)platform_get_drvdata(pdev); 76 struct evdi_device *evdi = drm_dev->dev_private; 77 78 if (evdi && !evdi_painter_is_connected(evdi)) 79 return true; 80 return false; 81 } 82 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org