Hi,

I'm trying to get a rtl8192du usb wifi dongle working on a sun7i board with OpenWRT master. They work fine with chaos calmer and kernel 3.18, but with master and 4.9 or 4.14 kernels, the module fails to load.

I am using the driver from https://github.com/lwfinger/rtl8192du, with the following package/kernel/rtl8192du/Makefile:

#
# Copyright (C) 2018 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#

include $(TOPDIR)/rules.mk

PKG_NAME:=rtl8192du
PKG_RELEASE:=1

PKG_SOURCE_URL:=https://github.com/lwfinger/rtl8192du
PKG_SOURCE_PROTO:=git
PKG_SOURCE_DATE:=2017-12-07
PKG_SOURCE_VERSION:=84d1edb3e738ec25dbab1c2ddcb931832e61e802
PKG_MIRROR_HASH:=4eabb4ce20617ce707a02a25daa2485ea3f747da8e9e98271171722739483357

include $(INCLUDE_DIR)/kernel.mk
include $(INCLUDE_DIR)/package.mk

define KernelPackage/rtl8192du
  SUBMENU:=Wireless Drivers
  TITLE:=Realtek RTL8192DU wireless USB 802.11n driver
  DEPENDS:=@USB_SUPPORT +@DRIVER_11N_SUPPORT +kmod-cfg80211 +kmod-mac80211 +kmod-usb-core
  FILES:=$(PKG_BUILD_DIR)/8192du.ko
# AUTOLOAD:=$(call AutoProbe,8192du)
endef

define KernelPackage/rtl8192du/description
        Kernel module for rtl8192du wireless.
endef

EXTRA_KCONFIG:= \
        CONFIG_CFG80211=m \
        CONFIG_CFG80211_CRDA_SUPPORT=y \
        CONFIG_CFG80211_DEBUGFS=y \
        CONFIG_CFG80211_WEXT=y \
        CONFIG_LIB80211=m \
        CONFIG_LIB80211_CRYPT_CCMP=m \
        CONFIG_LIB80211_CRYPT_TKIP=m \
        CONFIG_LIB80211_CRYPT_WEP=m \
        CONFIG_MAC80211=m \
        CONFIG_MAC80211_DEBUGFS=y \
        CONFIG_RTL8192DU=m \
        CONFIG_CONCURRENT_MODE=y \
        CONFIG_DUALMAC_CONCURRENT=y \
        CONFIG_POWER_SAVING="n"

NOSTDINC_FLAGS = \
        -I$(STAGING_DIR)/usr/include/mac80211 \
        -I$(STAGING_DIR)/usr/include/mac80211/uapi \
        -I$(STAGING_DIR)/usr/include/mac80211-backport \
        -include backport/backport.h 

MAKE_OPTS:= \
        ARCH="$(LINUX_KARCH)" \
        CROSS_COMPILE="$(TARGET_CROSS)" \
        SUBDIRS="$(PKG_BUILD_DIR)" \
        KSRC="$(LINUX_DIR)" \
        $(EXTRA_KCONFIG)
#       KBUILD_EXTRA_SYMBOLS="${STAGING_DIR}/usr/include/mac80211/Module.symvers"

#       $(CP) $(KERNEL_BUILD_DIR)/backports-*/Module.symvers.tmp $(STAGING_DIR)/usr/include/mac80211/Module.symvers
define Build/Compile
        $(MAKE) -C $(PKG_BUILD_DIR) $(MAKE_OPTS)
endef

define KernelPackage/rtl8192du/install
        mkdir -p $(1)/lib/firmware/rtlwifi
        $(INSTALL_DATA) $(PKG_BUILD_DIR)/rtl8192dufw.bin $(1)/lib/firmware/rtlwifi/
        $(INSTALL_DATA) $(PKG_BUILD_DIR)/rtl8192dufw_wol.bin $(1)/lib/firmware/rtlwifi/
endef

$(eval $(call KernelPackage,rtl8192du))

You can see a couple lines commented out which were things I tried, to fix the broken module symbols.

To begin with, I get a compilation error:

make[3]: Entering directory '/storage/src/Keezel/firmwares/openwrt-master/package/kernel/rtl8192du'
rm -f /storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/rtl8192du-2017-12-07-84d1edb3/.built
touch /storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/rtl8192du-2017-12-07-84d1edb3/.built_check
cat /dev/null > /storage/src/Keezel/firmwares/openwrt-master/staging_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/pkginfo/rtl8192du.symvers; for subdir in .; do cat /storage/src/Keezel/firmwares/openwrt-master/staging_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/pkginfo/*.symvers 2>/dev/null > /storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/rtl8192du-2017-12-07-84d1edb3/$subdir/Module.symvers; done
make -C "/storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/linux-4.14.14" ARCH="arm" CROSS_COMPILE="arm-openwrt-linux-muslgnueabi-" SUBDIRS="/storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/rtl8192du-2017-12-07-84d1edb3" KSRC="/storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/linux-4.14.14" CONFIG_RTL8192DU=m CONFIG_CONCURRENT_MODE=y CONFIG_DUALMAC_CONCURRENT=y CONFIG_AUTOCFG_CP=n CONFIG_POWER_SAVING=n CONFIG_USB_AUTOSUSPEND=n CONFIG_HW_PWRP_DETECTION=y CONFIG_WIFI_TEST=n CONFIG_BT_COEXISTENCE=n CONFIG_WAKE_ON_WLAN=n CONFIG_DRVEXT_MODULE=y  modules
make[4]: Entering directory '/storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/linux-4.14.14'
  CC [M]  /storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/rtl8192du-2017-12-07-84d1edb3/core/rtw_pwrctrl.o
/storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/rtl8192du-2017-12-07-84d1edb3/core/rtw_pwrctrl.c: In function 'pwr_state_check_handler':
/storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/rtl8192du-2017-12-07-84d1edb3/core/rtw_pwrctrl.c:203:33: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
  struct rtw_adapter *padapter = (struct adapter *)FunctionContext;
                                 ^
cc1: some warnings being treated as errors
scripts/Makefile.build:314: recipe for target '/storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/rtl8192du-2017-12-07-84d1edb3/core/rtw_pwrctrl.o' failed
make[5]: *** [/storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/rtl8192du-2017-12-07-84d1edb3/core/rtw_pwrctrl.o] Error 1
Makefile:1505: recipe for target '_module_/storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/rtl8192du-2017-12-07-84d1edb3' failed
make[4]: *** [_module_/storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/rtl8192du-2017-12-07-84d1edb3] Error 2
make[4]: Leaving directory '/storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/linux-4.14.14'
Makefile:69: recipe for target '/storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/rtl8192du-2017-12-07-84d1edb3/.built' failed
make[3]: *** [/storage/src/Keezel/firmwares/openwrt-master/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-sunxi_cortexa7/rtl8192du-2017-12-07-84d1edb3/.built] Error 2
make[3]: Leaving directory '/storage/src/Keezel/firmwares/openwrt-master/package/kernel/rtl8192du'
package/Makefile:106: recipe for target 'package/kernel/rtl8192du/compile' failed
make[2]: *** [package/kernel/rtl8192du/compile] Error 2
make[2]: Leaving directory '/storage/src/Keezel/firmwares/openwrt-master'
package/Makefile:102: recipe for target '/storage/src/Keezel/firmwares/openwrt-master/staging_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/stamp/.package_compile' failed
make[1]: *** [/storage/src/Keezel/firmwares/openwrt-master/staging_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/stamp/.package_compile] Error 2
make[1]: Leaving directory '/storage/src/Keezel/firmwares/openwrt-master'
/storage/src/Keezel/firmwares/openwrt-master/include/toplevel.mk:216: recipe for target 'world' failed
make: *** [world] Error 2

Which I tried to fix by just changing the cast:

--- ./core/rtw_pwrctrl.c-orig   2018-01-28 09:44:08.000000000 +0100
+++ ./core/rtw_pwrctrl.c        2018-01-28 09:48:17.453824588 +0100
@@ -200,7 +200,7 @@ static void pwr_state_check_handler(void
                from_timer(padapter, t,
                           pwrctrlpriv.pwr_state_check_timer);
 #else
-       struct rtw_adapter *padapter = (struct adapter *)FunctionContext;
+       struct rtw_adapter *padapter = (struct rtw_adapter *)FunctionContext;
 #endif
 
        rtw_ps_cmd(padapter);

And when building with kernel 4.14 by replacing 

#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)

with 

#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)

Both ways the code builds but when I modprobe the module it fails. With kernel 4.9 I get:

root@OpenWrt:/# insmod 8192du
[   26.313842] 8192du: Unknown symbol cfg80211_connect_bss (err 0)
[   26.320165] 8192du: Unknown symbol __ieee80211_get_channel (err 0)
failed to insert /lib/modules/4.9.77/8192du.ko
root@OpenWrt:/# uname -a
Linux OpenWrt 4.9.77 #0 SMP PREEMPT Wed Jan 31 10:29:03 2018 armv7l GNU/Linux
root@OpenWrt:/#

This should be trivial to fix. I guess since modules are built and packaged separately, at some point symvers get unsynced between the kernel and some modules.

Any ideas on how to fix this?

If instead, I build with 4.14:

root@OpenWrt:/lib/modules/4.14.14# insmod 8192du
[  243.939528] ------------[ cut here ]------------
[  243.944265] WARNING: CPU: 0 PID: 3429 at backports-2017-11-01/net/wireless/core.c:730 wiphy_register+0x290/0x714 [cfg80211]
[  243.955452] Modules linked in: 8192du(+) ath9k_htc ath9k_common rtl8192cu rtl8192c_common rtl_usb rt2800usb rt2800lib rt2500usb pppoe ppp_async cdc_mbim carl9170 brcmfmac ath9k_hw ath6kl_usb ath6kl_core ath zd1211rw usb8xxx sr9700 smsc95xx sierra_net rtlwifi rtl8xxxu rtl8187 rt73usb rt2x00usb rt2x00lib rndis_host qmi_wwan pppox ppp_generic plusb p54usb p54common nf_conntrack_ipv6 mt7601u mcs7830 mac80211 libertas kalmia iptable_nat ipt_REJECT ipt_MASQUERADE huawei_cdc_ncm dm9601 cfg80211 cdc_subset cdc_ncm cdc_ether cdc_eem ax88179_178a asix xt_time xt_tcpudp xt_tcpmss xt_statistic xt_state xt_recent xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_helper xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_HL xt_DSCP xt_CT xt_CLASSIFY
[  244.026821]  wireguard usbnet slhc rtl8150 r8712u r8152 pegasus nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat nf_log_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache lib80211_crypt_wep lib80211_crypt_tkip lib80211_crypt_ccmp lib80211 kaweth iptable_mangle iptable_filter ipt_ECN ipheth ip_tables hso crc_itu_t crc_ccitt compat cdc_wdm brcmutil sch_cake nf_conntrack act_skbedit act_mirred em_u32 cls_u32 cls_tcindex cls_flow cls_route cls_fw sch_tbf sch_htb sch_hfsc sch_ingress cryptodev ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables x_tables ifb ip6_udp_tunnel udp_tunnel tun eeprom_93cx6 authenc uas sd_mod gpio_button_hotplug button_hotplug
[  244.092254] CPU: 0 PID: 3429 Comm: insmod Not tainted 4.14.14 #0
[  244.098255] Hardware name: Allwinner sun7i (A20) Family
[  244.103505] [<c020d1f0>] (unwind_backtrace) from [<c0209e40>] (show_stack+0x10/0x14)
[  244.111246] [<c0209e40>] (show_stack) from [<c068d87c>] (dump_stack+0x7c/0x9c)
[  244.118469] [<c068d87c>] (dump_stack) from [<c021b640>] (__warn+0xbc/0xec)
[  244.125342] [<c021b640>] (__warn) from [<c021b714>] (warn_slowpath_null+0x1c/0x24)
[  244.132965] [<c021b714>] (warn_slowpath_null) from [<bf3bdde0>] (wiphy_register+0x290/0x714 [cfg80211])
[  244.142609] [<bf3bdde0>] (wiphy_register [cfg80211]) from [<bf781ab8>] (rtw_wdev_alloc+0xd4/0x1b4 [8192du])
[  244.152530] [<bf781ab8>] (rtw_wdev_alloc [8192du]) from [<bf776adc>] (rtw_drv_init+0x2e8/0x5dc [8192du])
[  244.162078] [<bf776adc>] (rtw_drv_init [8192du]) from [<c04e5694>] (usb_probe_interface+0x168/0x204)
[  244.171211] [<c04e5694>] (usb_probe_interface) from [<c047a6e4>] (driver_probe_device+0x158/0x2d8)
[  244.180164] [<c047a6e4>] (driver_probe_device) from [<c047a8e4>] (__driver_attach+0x80/0xa4)
[  244.188595] [<c047a8e4>] (__driver_attach) from [<c0478fd4>] (bus_for_each_dev+0x68/0x8c)
[  244.196766] [<c0478fd4>] (bus_for_each_dev) from [<c0479d3c>] (bus_add_driver+0xc8/0x1dc)
[  244.204937] [<c0479d3c>] (bus_add_driver) from [<c047b154>] (driver_register+0x9c/0xe0)
[  244.212936] [<c047b154>] (driver_register) from [<c04e4480>] (usb_register_driver+0x68/0x11c)
[  244.221518] [<c04e4480>] (usb_register_driver) from [<bf7a002c>] (init_module+0x2c/0x1000 [8192du])
[  244.230660] [<bf7a002c>] (init_module [8192du]) from [<c0201994>] (do_one_initcall+0xb4/0x170)
[  244.239273] [<c0201994>] (do_one_initcall) from [<c027d624>] (do_init_module+0x54/0x1b0)
[  244.247360] [<c027d624>] (do_init_module) from [<c027c6bc>] (load_module+0x17f8/0x1ccc)
[  244.255360] [<c027c6bc>] (load_module) from [<c027cc90>] (SyS_init_module+0x100/0x110)
[  244.263273] [<c027cc90>] (SyS_init_module) from [<c0206e00>] (ret_fast_syscall+0x0/0x4c)
[  244.271499] ---[ end trace 665d7648496bfdfe ]---
[  244.276123] ------------[ cut here ]------------
[  244.280843] WARNING: CPU: 0 PID: 3429 at backports-2017-11-01/net/wireless/core.c:789 wiphy_register+0x60/0x714 [cfg80211]
[  244.291905] Modules linked in: 8192du(+) ath9k_htc ath9k_common rtl8192cu rtl8192c_common rtl_usb rt2800usb rt2800lib rt2500usb pppoe ppp_async cdc_mbim carl9170 brcmfmac ath9k_hw ath6kl_usb ath6kl_core ath zd1211rw usb8xxx sr9700 smsc95xx sierra_net rtlwifi rtl8xxxu rtl8187 rt73usb rt2x00usb rt2x00lib rndis_host qmi_wwan pppox ppp_generic plusb p54usb p54common nf_conntrack_ipv6 mt7601u mcs7830 mac80211 libertas kalmia iptable_nat ipt_REJECT ipt_MASQUERADE huawei_cdc_ncm dm9601 cfg80211 cdc_subset cdc_ncm cdc_ether cdc_eem ax88179_178a asix xt_time xt_tcpudp xt_tcpmss xt_statistic xt_state xt_recent xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_helper xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_HL xt_DSCP xt_CT xt_CLASSIFY
[  244.363230]  wireguard usbnet slhc rtl8150 r8712u r8152 pegasus nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat nf_log_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache lib80211_crypt_wep lib80211_crypt_tkip lib80211_crypt_ccmp lib80211 kaweth iptable_mangle iptable_filter ipt_ECN ipheth ip_tables hso crc_itu_t crc_ccitt compat cdc_wdm brcmutil sch_cake nf_conntrack act_skbedit act_mirred em_u32 cls_u32 cls_tcindex cls_flow cls_route cls_fw sch_tbf sch_htb sch_hfsc sch_ingress cryptodev ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables x_tables ifb ip6_udp_tunnel udp_tunnel tun eeprom_93cx6 authenc uas sd_mod gpio_button_hotplug button_hotplug
[  244.428643] CPU: 0 PID: 3429 Comm: insmod Tainted: G        W       4.14.14 #0
[  244.435857] Hardware name: Allwinner sun7i (A20) Family
[  244.441098] [<c020d1f0>] (unwind_backtrace) from [<c0209e40>] (show_stack+0x10/0x14)
[  244.448840] [<c0209e40>] (show_stack) from [<c068d87c>] (dump_stack+0x7c/0x9c)
[  244.456062] [<c068d87c>] (dump_stack) from [<c021b640>] (__warn+0xbc/0xec)
[  244.462935] [<c021b640>] (__warn) from [<c021b714>] (warn_slowpath_null+0x1c/0x24)
[  244.470550] [<c021b714>] (warn_slowpath_null) from [<bf3bdbb0>] (wiphy_register+0x60/0x714 [cfg80211])
[  244.479993] [<bf3bdbb0>] (wiphy_register [cfg80211]) from [<bf781ab8>] (rtw_wdev_alloc+0xd4/0x1b4 [8192du])
[  244.489849] [<bf781ab8>] (rtw_wdev_alloc [8192du]) from [<bf776adc>] (rtw_drv_init+0x2e8/0x5dc [8192du])
[  244.499393] [<bf776adc>] (rtw_drv_init [8192du]) from [<c04e5694>] (usb_probe_interface+0x168/0x204)
[  244.508525] [<c04e5694>] (usb_probe_interface) from [<c047a6e4>] (driver_probe_device+0x158/0x2d8)
[  244.517478] [<c047a6e4>] (driver_probe_device) from [<c047a8e4>] (__driver_attach+0x80/0xa4)
[  244.525909] [<c047a8e4>] (__driver_attach) from [<c0478fd4>] (bus_for_each_dev+0x68/0x8c)
[  244.534080] [<c0478fd4>] (bus_for_each_dev) from [<c0479d3c>] (bus_add_driver+0xc8/0x1dc)
[  244.542251] [<c0479d3c>] (bus_add_driver) from [<c047b154>] (driver_register+0x9c/0xe0)
[  244.550250] [<c047b154>] (driver_register) from [<c04e4480>] (usb_register_driver+0x68/0x11c)
[  244.558832] [<c04e4480>] (usb_register_driver) from [<bf7a002c>] (init_module+0x2c/0x1000 [8192du])
[  244.567930] [<bf7a002c>] (init_module [8192du]) from [<c0201994>] (do_one_initcall+0xb4/0x170)
[  244.576542] [<c0201994>] (do_one_initcall) from [<c027d624>] (do_init_module+0x54/0x1b0)
[  244.584628] [<c027d624>] (do_init_module) from [<c027c6bc>] (load_module+0x17f8/0x1ccc)
[  244.592628] [<c027c6bc>] (load_module) from [<c027cc90>] (SyS_init_module+0x100/0x110)
[  244.600541] [<c027cc90>] (SyS_init_module) from [<c0206e00>] (ret_fast_syscall+0x0/0x4c)
[  244.608740] ---[ end trace 665d7648496bfdff ]---
[  244.613739] usbcore: registered new interface driver rtl8192du