tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git pending-4.4 head: 6c69917afdae1284331f6ff2508ee96417c16aed commit: 6c69917afdae1284331f6ff2508ee96417c16aed [25/25] net: mdio-mux: Handle -EPROBE_DEFER correctly config: alpha-buildonly-randconfig-r002-20210822 (attached as .config) compiler: alpha-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 # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable pending-4.4 git checkout 6c69917afdae1284331f6ff2508ee96417c16aed # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross O=build_dir ARCH=alpha SHELL=/bin/bash drivers/gpu/drm/ drivers/net/phy/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/list.h:8:0, from include/linux/agp_backend.h:33, from include/drm/drmP.h:35, from drivers/gpu/drm/drm_fops.c:37: drivers/gpu/drm/drm_fops.c: In function 'drm_open_helper': struct pci_bus *b = list_entry(pci_root_buses.next, ^ include/linux/kernel.h:815:49: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^~~ drivers/gpu/drm/drm_fops.c:272:24: note: in expansion of macro 'list_entry' struct pci_bus *b = list_entry(pci_root_buses.next, ^~~~~~~~~~ drivers/gpu/drm/drm_fops.c:272:35: note: each undeclared identifier is reported only once for each function it appears in struct pci_bus *b = list_entry(pci_root_buses.next, ^ include/linux/kernel.h:815:49: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^~~ drivers/gpu/drm/drm_fops.c:272:24: note: in expansion of macro 'list_entry' struct pci_bus *b = list_entry(pci_root_buses.next, ^~~~~~~~~~ drivers/gpu/drm/drm_fops.c: In function 'drm_read': drivers/gpu/drm/drm_fops.c:544:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (e->event->length + ret > count) ^ In file included from arch/alpha/include/asm/io.h:218:0, from include/linux/scatterlist.h:8, from include/linux/dma-mapping.h:10, from include/drm/drmP.h:37, from drivers/gpu/drm/drm_fops.c:37: drivers/gpu/drm/drm_fops.c: At top level: arch/alpha/include/asm/jensen.h:166:3: warning: 'jensen_bus_outb' is static but used in inline function 'jensen_outb' which is not static jensen_bus_outb(b, addr); ^~~~~~~~~~~~~~~ arch/alpha/include/asm/jensen.h:164:3: warning: 'jensen_local_outb' is static but used in inline function 'jensen_outb' which is not static jensen_local_outb(b, addr); ^~~~~~~~~~~~~~~~~ arch/alpha/include/asm/jensen.h:158:10: warning: 'jensen_bus_inb' is static but used in inline function 'jensen_inb' which is not static return jensen_bus_inb(addr); ^~~~~~~~~~~~~~ arch/alpha/include/asm/jensen.h:156:10: warning: 'jensen_local_inb' is static but used in inline function 'jensen_inb' which is not static return jensen_local_inb(addr); ^~~~~~~~~~~~~~~~ -- In file included from include/linux/if_ether.h:23:0, from include/uapi/linux/ethtool.h:17, from include/linux/ethtool.h:16, from include/linux/phy.h:20, from include/linux/of_mdio.h:12, from drivers/net/phy/mdio-mux.c:11: include/linux/skbuff.h: In function 'skb_add_data': include/linux/skbuff.h:2687:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] &csum, from) == copy) { ^~ include/linux/skbuff.h:2691:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] } else if (copy_from_iter(skb_put(skb, copy), copy, from) == copy) ^~ include/linux/skbuff.h: In function 'skb_can_coalesce': include/linux/skbuff.h:2705:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] off == frag->page_offset + skb_frag_size(frag); ^~ include/linux/skbuff.h: In function 'memcpy_from_msg': include/linux/skbuff.h:2933:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return copy_from_iter(data, len, &msg->msg_iter) == len ? 0 : -EFAULT; ^~ include/linux/skbuff.h: In function 'memcpy_to_msg': include/linux/skbuff.h:2938:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return copy_to_iter(data, len, &msg->msg_iter) == len ? 0 : -EFAULT; ^~ drivers/net/phy/mdio-mux.c: In function 'mdio_mux_init': goto err_loop; ^~~~ In file included from arch/alpha/include/asm/io.h:218:0, from include/linux/scatterlist.h:8, from include/linux/dma-mapping.h:10, from include/linux/skbuff.h:34, from include/linux/if_ether.h:23, from include/uapi/linux/ethtool.h:17, from include/linux/ethtool.h:16, from include/linux/phy.h:20, from include/linux/of_mdio.h:12, from drivers/net/phy/mdio-mux.c:11: drivers/net/phy/mdio-mux.c: At top level: arch/alpha/include/asm/jensen.h:166:3: warning: 'jensen_bus_outb' is static but used in inline function 'jensen_outb' which is not static jensen_bus_outb(b, addr); ^~~~~~~~~~~~~~~ arch/alpha/include/asm/jensen.h:164:3: warning: 'jensen_local_outb' is static but used in inline function 'jensen_outb' which is not static jensen_local_outb(b, addr); ^~~~~~~~~~~~~~~~~ arch/alpha/include/asm/jensen.h:158:10: warning: 'jensen_bus_inb' is static but used in inline function 'jensen_inb' which is not static return jensen_bus_inb(addr); ^~~~~~~~~~~~~~ arch/alpha/include/asm/jensen.h:156:10: warning: 'jensen_local_inb' is static but used in inline function 'jensen_inb' which is not static return jensen_local_inb(addr); ^~~~~~~~~~~~~~~~ vim +/err_loop +172 drivers/net/phy/mdio-mux.c 95 96 int mdio_mux_init(struct device *dev, 97 int (*switch_fn)(int cur, int desired, void *data), 98 void **mux_handle, 99 void *data) 100 { 101 struct device_node *parent_bus_node; 102 struct device_node *child_bus_node; 103 int r, ret_val; 104 struct mii_bus *parent_bus; 105 struct mdio_mux_parent_bus *pb; 106 struct mdio_mux_child_bus *cb; 107 108 if (!dev->of_node) 109 return -ENODEV; 110 111 parent_bus_node = of_parse_phandle(dev->of_node, "mdio-parent-bus", 0); 112 113 if (!parent_bus_node) 114 return -ENODEV; 115 116 pb = devm_kzalloc(dev, sizeof(*pb), GFP_KERNEL); 117 if (pb == NULL) { 118 ret_val = -ENOMEM; 119 goto err_parent_bus; 120 } 121 122 parent_bus = of_mdio_find_bus(parent_bus_node); 123 if (parent_bus == NULL) { 124 ret_val = -EPROBE_DEFER; 125 goto err_parent_bus; 126 } 127 128 pb->switch_data = data; 129 pb->switch_fn = switch_fn; 130 pb->current_child = -1; 131 pb->parent_id = parent_count++; 132 pb->mii_bus = parent_bus; 133 134 ret_val = -ENODEV; 135 for_each_available_child_of_node(dev->of_node, child_bus_node) { 136 u32 v; 137 138 r = of_property_read_u32(child_bus_node, "reg", &v); 139 if (r) 140 continue; 141 142 cb = devm_kzalloc(dev, sizeof(*cb), GFP_KERNEL); 143 if (cb == NULL) { 144 dev_err(dev, 145 "Error: Failed to allocate memory for child\n"); 146 ret_val = -ENOMEM; 147 of_node_put(child_bus_node); 148 break; 149 } 150 cb->bus_number = v; 151 cb->parent = pb; 152 153 cb->mii_bus = mdiobus_alloc(); 154 if (!cb->mii_bus) { 155 ret_val = -ENOMEM; 156 of_node_put(child_bus_node); 157 break; 158 } 159 cb->mii_bus->priv = cb; 160 cb->mii_bus->irq = cb->phy_irq; 161 cb->mii_bus->name = "mdio_mux"; 162 snprintf(cb->mii_bus->id, MII_BUS_ID_SIZE, "%x.%x", 163 pb->parent_id, v); 164 cb->mii_bus->parent = dev; 165 cb->mii_bus->read = mdio_mux_read; 166 cb->mii_bus->write = mdio_mux_write; 167 r = of_mdiobus_register(cb->mii_bus, child_bus_node); 168 if (r) { 169 mdiobus_free(cb->mii_bus); 170 if (r == -EPROBE_DEFER) { 171 ret_val = r; 173 } 174 devm_kfree(dev, cb); 175 dev_err(dev, 176 "Error: Failed to register MDIO bus for child %pOF\n", 177 child_bus_node); 178 } else { 179 of_node_get(child_bus_node); 180 cb->next = pb->children; 181 pb->children = cb; 182 } 183 } 184 if (pb->children) { 185 *mux_handle = pb; 186 dev_info(dev, "Version " DRV_VERSION "\n"); 187 return 0; 188 } 189 190 /* balance the reference of_mdio_find_bus() took */ 191 put_device(&pb->mii_bus->dev); 192 193 err_parent_bus: 194 of_node_put(parent_bus_node); 195 return ret_val; 196 } 197 EXPORT_SYMBOL_GPL(mdio_mux_init); 198 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org