Can not works with linux4.1.15

[ShawnLiaoLSQ]

below is some debug message:
RTW: module init start
RTW: rtl8821cu v5.4.1_28754.20180921_COEX20180712-3232
RTW: build time: Oct 16 2022 19:58:00
RTW: rtl8821cu BT-Coex version = COEX20180712-3232
RTW: [HALMAC]11692M
HALMAC_MAJOR_VER = 1
HALMAC_PROTOTYPE_VER = 4
HALMAC_MINOR_VER = 19
HALMAC_PATCH_VER = 3
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: HW EFUSE
RTW: 0x000: 29 81 00 BC 09 00 21 00 6E 04 A4 10 10 00 30 0B
RTW: 0x010: FF FF FF FF FF FF FF FF FF FF FF 02 FF FF FF FF
RTW: 0x020: FF FF 22 21 21 22 24 25 25 26 26 26 27 27 27 27
RTW: 0x030: 02 FF FF FF FF FF 0E FF FF FF 1F 1F 20 21 21 21
RTW: 0x040: 2A 2A 2A 2B 2B 02 FF FF FF FF FF FF FF FF FF FF
RTW: 0x050: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x060: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x070: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x080: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x090: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x0A0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x0B0: FF FF FF FF FF FF FF FF 29 1F 1D 00 FF FF FF FF
RTW: 0x0C0: FF 00 00 41 00 00 00 00 00 FF 22 FF FF FF FF FF
RTW: 0x0D0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x0E0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x0F0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x100: DA 0B 11 C8 E3 46 02 4C 77 66 2E 11 FF 09 03 52
RTW: 0x110: 65 61 6C 74 65 6B 0E 03 38 30 32 2E 31 31 61 63
RTW: 0x120: 20 4E 49 43 08 03 31 32 33 34 35 36 FF FF FF FF
RTW: 0x130: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x140: FF FF FF FF 00 00 31 0F FF FF FF FF FF FF FF FF
RTW: 0x150: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x160: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x170: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x180: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x190: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x1A0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x1B0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x1C0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x1D0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x1E0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x1F0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: hal_com_config_channel_plan chplan:0x29
RTW: [HALMAC][ALWAYS]shall R reg twice!!
RTW: WARN [HALMAC][WARN]H2C/C2H ver is compatible!!
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: rtw_regsty_chk_target_tx_power_valid return _FALSE for band:0, path:0, rs:0, t:-1
RTW: rtw_ndev_init(wlan0) if1 mac_addr=4c:77:66:2e:11:ff
usbcore: registered new interface driver rtl8821cu
RTW: module init ret=0

[zhangyihang2333]

hello ,lucky to hear that you had tried to use the rtl8821cu driver in linux4.1.15,I also meet the same problem ,and the log is

RTW: module init start
RTW: rtl8821cu v5.8.1_34171.20190628_COEX20190509-4141
RTW: build time: Mar 25 2024 21:58:21
RTW: rtl8821cu BT-Coex version = COEX20190509-4141
RTW: [HALMAC]11692M
HALMAC_MAJOR_VER = 1
HALMAC_PROTOTYPE_VER = 6
HALMAC_MINOR_VER = 5
HALMAC_PATCH_VER = 5
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: HW EFUSE
RTW: 0x000: 29 81 00 BC 09 00 21 00 6E 04 A4 34 10 00 30 0B
RTW: 0x010: FF FF FF FF FF FF FF FF FF FF FF 02 FF FF FF FF
RTW: 0x020: FF FF 21 22 22 23 25 23 23 23 25 28 28 26 2A 2A
RTW: 0x030: 00 FF FF FF FF FF 00 FF FF FF 30 30 2F 2F 2F 2F
RTW: 0x040: 30 30 2F 2F 2F 00 FF FF FF FF FF FF FF FF FF FF
RTW: 0x050: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x060: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x070: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x080: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x090: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x0A0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x0B0: FF FF FF FF FF FF FF FF 7F 33 1C 00 FF FF FF FF
RTW: 0x0C0: FF 21 00 41 00 00 00 00 00 FF 22 FF FF FF FF FF
RTW: 0x0D0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x0E0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x0F0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x100: DA 0B 20 C8 E3 46 02 E0 E1 A9 3C 51 CE 09 03 52
RTW: 0x110: 65 61 6C 74 65 6B 0E 03 38 30 32 2E 31 31 61 63
RTW: 0x120: 20 4E 49 43 08 03 31 32 33 34 35 36 FF FF FF FF
RTW: 0x130: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x140: FF FF FF FF 00 00 31 0F FF FF FF FF FF FF FF FF
RTW: 0x150: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x160: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x170: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x180: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x190: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x1A0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x1B0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x1C0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x1D0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x1E0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: 0x1F0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
RTW: hal_com_config_channel_plan chplan:0x7F
RTW: [HALMAC][ALWAYS]shall R reg twice!!
RTW: WARN [HALMAC][WARN]the H2C ver. does not match halmac
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: ERROR [HALMAC][ERR]Dump efuse in suspend
RTW: [RF_PATH] IC's RF PATH:RF_1T1R, max_tx_cnt:1
RTW: [RF_PATH] PG's trx_path_bmp:0x00, max_tx_cnt:0
RTW: [RF_PATH] Registry's RF PATH:UNKNOWN
RTW: [RF_PATH] HALDATA's trx_path_bmp:0x11, max_tx_cnt:1
RTW: [RF_PATH] HALDATA's RF PATH:RF_1T1R
RTW: [RF_PATH] NumTotalRFPath:1
RTW: [TRX_Nss] HALSPEC - tx_nss :1, rx_nss:1
RTW: [TRX_Nss] Registry - tx_nss :0, rx_nss:0
RTW: [TRX_Nss] HALDATA - tx_nss :1, rx_nss:1
RTW: rtw_regsty_chk_target_tx_power_valid return _FALSE for band:0, path:0, rs:0, t:-1
------------[ cut here ]------------
WARNING: CPU: 0 PID: 75 at net/wireless/core.c:609 wiphy_register+0x378/0x738()
Modules linked in: 8821cu(+)
CPU: 0 PID: 75 Comm: modprobe Not tainted 4.1.15 #7
Hardware name: Freescale i.MX6 Ultralite (Device Tree)
[<80015dbc>] (unwind_backtrace) from [<80012748>] (show_stack+0x10/0x14)
[<80012748>] (show_stack) from [<806a1d20>] (dump_stack+0x84/0xc4)
[<806a1d20>] (dump_stack) from [<80036ee0>] (warn_slowpath_common+0x80/0xb0)
[<80036ee0>] (warn_slowpath_common) from [<80036fac>] (warn_slowpath_null+0x1c/0x24)
[<80036fac>] (warn_slowpath_null) from [<80633058>] (wiphy_register+0x378/0x738)
[<80633058>] (wiphy_register) from [<7f0a2e28>] (rtw_wiphy_register+0x50/0x58 [8821cu])
[<7f0a2e28>] (rtw_wiphy_register [8821cu]) from [<7f0a327c>] (rtw_cfg80211_ndev_res_register+0x14/0x68 [8821cu])
[<7f0a327c>] (rtw_cfg80211_ndev_res_register [8821cu]) from [<7f07fb30>] (rtw_os_ndev_register+0x100/0x19c [8821cu])
[<7f07fb30>] (rtw_os_ndev_register [8821cu]) from [<7f080de0>] (rtw_os_ndevs_register+0xd8/0x154 [8821cu])
[<7f080de0>] (rtw_os_ndevs_register [8821cu]) from [<7f080ec8>] (rtw_os_ndevs_init+0x20/0x48 [8821cu])
[<7f080ec8>] (rtw_os_ndevs_init [8821cu]) from [<7f083248>] (rtw_drv_init+0x59c/0x6a8 [8821cu])
[<7f083248>] (rtw_drv_init [8821cu]) from [<80429564>] (usb_probe_interface+0x16c/0x22c)
[<80429564>] (usb_probe_interface) from [<80348130>] (driver_probe_device+0x174/0x2b4)
[<80348130>] (driver_probe_device) from [<80348340>] (__driver_attach+0x8c/0x90)
[<80348340>] (__driver_attach) from [<80346694>] (bus_for_each_dev+0x68/0x9c)
[<80346694>] (bus_for_each_dev) from [<803478cc>] (bus_add_driver+0x148/0x1f0)
[<803478cc>] (bus_add_driver) from [<8034893c>] (driver_register+0x78/0xf8)
[<8034893c>] (driver_register) from [<804281cc>] (usb_register_driver+0x70/0x134)
[<804281cc>] (usb_register_driver) from [<7f2830cc>] (rtw_drv_entry+0xcc/0x128 [8821cu])
[<7f2830cc>] (rtw_drv_entry [8821cu]) from [<80009730>] (do_one_initcall+0x8c/0x1d8)
[<80009730>] (do_one_initcall) from [<8069fc8c>] (do_init_module+0x5c/0x1a8)
[<8069fc8c>] (do_init_module) from [<8009560c>] (load_module+0x1904/0x1dc8)
[<8009560c>] (load_module) from [<80095c54>] (SyS_finit_module+0x64/0x74)
[<80095c54>] (SyS_finit_module) from [<8000f480>] (ret_fast_syscall+0x0/0x3c)
---[ end trace de52742742d71c35 ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 75 at drivers/net/wireless/realtek/rtl8821CU/os_dep/linux/os_intfs.c:1899 rtw_os_ndev_register+0x50/0x19c 8821cu
Modules linked in: 8821cu(+)
CPU: 0 PID: 75 Comm: modprobe Tainted: G W 4.1.15 #7
Hardware name: Freescale i.MX6 Ultralite (Device Tree)
[<80015dbc>] (unwind_backtrace) from [<80012748>] (show_stack+0x10/0x14)
[<80012748>] (show_stack) from [<806a1d20>] (dump_stack+0x84/0xc4)
[<806a1d20>] (dump_stack) from [<80036ee0>] (warn_slowpath_common+0x80/0xb0)
[<80036ee0>] (warn_slowpath_common) from [<80036fac>] (warn_slowpath_null+0x1c/0x24)
[<80036fac>] (warn_slowpath_null) from [<7f07fa80>] (rtw_os_ndev_register+0x50/0x19c [8821cu])
[<7f07fa80>] (rtw_os_ndev_register [8821cu]) from [<7f080de0>] (rtw_os_ndevs_register+0xd8/0x154 [8821cu])
[<7f080de0>] (rtw_os_ndevs_register [8821cu]) from [<7f080ec8>] (rtw_os_ndevs_init+0x20/0x48 [8821cu])
[<7f080ec8>] (rtw_os_ndevs_init [8821cu]) from [<7f083248>] (rtw_drv_init+0x59c/0x6a8 [8821cu])
[<7f083248>] (rtw_drv_init [8821cu]) from [<80429564>] (usb_probe_interface+0x16c/0x22c)
[<80429564>] (usb_probe_interface) from [<80348130>] (driver_probe_device+0x174/0x2b4)
[<80348130>] (driver_probe_device) from [<80348340>] (__driver_attach+0x8c/0x90)
[<80348340>] (__driver_attach) from [<80346694>] (bus_for_each_dev+0x68/0x9c)
[<80346694>] (bus_for_each_dev) from [<803478cc>] (bus_add_driver+0x148/0x1f0)
[<803478cc>] (bus_add_driver) from [<8034893c>] (driver_register+0x78/0xf8)
[<8034893c>] (driver_register) from [<804281cc>] (usb_register_driver+0x70/0x134)
[<804281cc>] (usb_register_driver) from [<7f2830cc>] (rtw_drv_entry+0xcc/0x128 [8821cu])
[<7f2830cc>] (rtw_drv_entry [8821cu]) from [<80009730>] (do_one_initcall+0x8c/0x1d8)
[<80009730>] (do_one_initcall) from [<8069fc8c>] (do_init_module+0x5c/0x1a8)
[<8069fc8c>] (do_init_module) from [<8009560c>] (load_module+0x1904/0x1dc8)
[<8009560c>] (load_module) from [<80095c54>] (SyS_finit_module+0x64/0x74)
[<80095c54>] (SyS_finit_module) from [<8000f480>] (ret_fast_syscall+0x0/0x3c)
---[ end trace de52742742d71c36 ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 75 at drivers/net/wireless/realtek/rtl8821CU/os_dep/linux/os_intfs.c:3419 rtw_os_ndevs_register+0xf4/0x154 8821cu
Modules linked in: 8821cu(+)
CPU: 0 PID: 75 Comm: modprobe Tainted: G W 4.1.15 #7
Hardware name: Freescale i.MX6 Ultralite (Device Tree)
[<80015dbc>] (unwind_backtrace) from [<80012748>] (show_stack+0x10/0x14)
[<80012748>] (show_stack) from [<806a1d20>] (dump_stack+0x84/0xc4)
[<806a1d20>] (dump_stack) from [<80036ee0>] (warn_slowpath_common+0x80/0xb0)
[<80036ee0>] (warn_slowpath_common) from [<80036fac>] (warn_slowpath_null+0x1c/0x24)
[<80036fac>] (warn_slowpath_null) from [<7f080dfc>] (rtw_os_ndevs_register+0xf4/0x154 [8821cu])
[<7f080dfc>] (rtw_os_ndevs_register [8821cu]) from [<7f080ec8>] (rtw_os_ndevs_init+0x20/0x48 [8821cu])
[<7f080ec8>] (rtw_os_ndevs_init [8821cu]) from [<7f083248>] (rtw_drv_init+0x59c/0x6a8 [8821cu])
[<7f083248>] (rtw_drv_init [8821cu]) from [<80429564>] (usb_probe_interface+0x16c/0x22c)
[<80429564>] (usb_probe_interface) from [<80348130>] (driver_probe_device+0x174/0x2b4)
[<80348130>] (driver_probe_device) from [<80348340>] (__driver_attach+0x8c/0x90)
[<80348340>] (__driver_attach) from [<80346694>] (bus_for_each_dev+0x68/0x9c)
[<80346694>] (bus_for_each_dev) from [<803478cc>] (bus_add_driver+0x148/0x1f0)
[<803478cc>] (bus_add_driver) from [<8034893c>] (driver_register+0x78/0xf8)
[<8034893c>] (driver_register) from [<804281cc>] (usb_register_driver+0x70/0x134)
[<804281cc>] (usb_register_driver) from [<7f2830cc>] (rtw_drv_entry+0xcc/0x128 [8821cu])
[<7f2830cc>] (rtw_drv_entry [8821cu]) from [<80009730>] (do_one_initcall+0x8c/0x1d8)
[<80009730>] (do_one_initcall) from [<8069fc8c>] (do_init_module+0x5c/0x1a8)
[<8069fc8c>] (do_init_module) from [<8009560c>] (load_module+0x1904/0x1dc8)
[<8009560c>] (load_module) from [<80095c54>] (SyS_finit_module+0x64/0x74)
[<80095c54>] (SyS_finit_module) from [<8000f480>] (ret_fast_syscall+0x0/0x3c)
---[ end trace de52742742d71c37 ]---
RTW: WARN free_recv_skb_queue not empty, 8
RTW: WARN free_recv_skb_queue not empty, 8
usbcore: registered new interface driver rtl8821cu
RTW: module init ret=0

if you have solve it ,can you give me some suggestion？or if you are sure that this version does not work with the driver. ths to your reply.