netdev - lan78xx: Failed to sync IRQ enable register: -ENODEV

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Message-ID: <3d4bda4e-f4e8-455e-87ec-2a84d6924d76@gmx.net>
Date: Sun, 13 Apr 2025 21:49:00 +0200
From: Stefan Wahren <wahrenst@....net>
To: Thangaraj Samynathan <Thangaraj.S@...rochip.com>,
 Rengarajan Sundararajan <Rengarajan.S@...rochip.com>,
 Oleksij Rempel <o.rempel@...gutronix.de>
Cc: netdev <netdev@...r.kernel.org>,
 "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: lan78xx: Failed to sync IRQ enable register: -ENODEV

Hi,
i noticed that recent changes to lan78xx introduced error messages to
the bootlog of Raspberry Pi 3 B Plus (arm/multi_v7_defconfig, 6.15.0-rc1).

[    8.715374] lan78xx 1-1.1.1:1.0 (unnamed net_device) (uninitialized):
No External EEPROM. Setting MAC Speed
[    9.313859] usbcore: registered new interface driver lan78xx
[   10.132752] vchiq: module is from the staging directory, the quality
is unknown, you have been warned.
[   10.533613] usbcore: registered new device driver onboard-usb-dev
[   10.533861] usb 1-1.1: USB disconnect, device number 3
[   10.533880] usb 1-1.1.1: USB disconnect, device number 6
[   10.656641] lan78xx 1-1.1.1:1.0 eth0 (unregistered): Failed to sync
IRQ enable register: -ENODEV
[   10.657440] lan78xx 1-1.1.1:1.0 eth0 (unregistered): Failed to sync
IRQ enable register: -ENODEV
[   10.658819] usb 1-1.1.2: USB disconnect, device number 5

Since this happend during only two times during boot, i added a
WARN_ON() in this specific case in order to see what's going on:

[   10.655832] ------------[ cut here ]------------
[   10.655865] WARNING: CPU: 1 PID: 161 at
drivers/net/usb/lan78xx.c:2442 lan78xx_irq_bus_sync_unlock+0x94/0xb0
[lan78xx]
[   10.655903] Modules linked in: soundcore onboard_usb_dev(+) drm_exec
ecdh_generic drm_dma_helper ecc raspberrypi_hwmon libaes bcm2835_thermal
vchiq(C) microchip lan78xx
[   10.655966] CPU: 1 UID: 0 PID: 161 Comm: systemd-udevd Tainted:
G         C          6.15.0-rc1-00002-g5f5bffb44607-dirty #431 NONE
[   10.655976] Tainted: [C]=CRAP
[   10.655980] Hardware name: BCM2835
[   10.655984] Call trace:
[   10.655999]  unwind_backtrace from show_stack+0x10/0x14
[   10.656027]  show_stack from dump_stack_lvl+0x50/0x64
[   10.656043]  dump_stack_lvl from __warn+0x80/0x128
[   10.656062]  __warn from warn_slowpath_fmt+0x170/0x178
[   10.656076]  warn_slowpath_fmt from
lan78xx_irq_bus_sync_unlock+0x94/0xb0 [lan78xx]
[   10.656092]  lan78xx_irq_bus_sync_unlock [lan78xx] from
free_irq+0x308/0x318
[   10.656110]  free_irq from phy_disconnect+0x2c/0x48
[   10.656131]  phy_disconnect from lan78xx_disconnect+0x80/0x14c [lan78xx]
[   10.656143]  lan78xx_disconnect [lan78xx] from
usb_unbind_interface+0x7c/0x290
[   10.656161]  usb_unbind_interface from
device_release_driver_internal+0x180/0x1f4
[   10.656177]  device_release_driver_internal from
bus_remove_device+0xc0/0xe4
[   10.656193]  bus_remove_device from device_del+0x138/0x424
[   10.656209]  device_del from usb_disable_device+0xc4/0x170
[   10.656223]  usb_disable_device from usb_disconnect+0xdc/0x270
[   10.656238]  usb_disconnect from usb_disconnect+0xa8/0x270
[   10.656252]  usb_disconnect from hub_quiesce+0x68/0xb4
[   10.656268]  hub_quiesce from hub_disconnect+0x38/0x164
[   10.656284]  hub_disconnect from usb_unbind_interface+0x7c/0x290
[   10.656298]  usb_unbind_interface from
device_release_driver_internal+0x180/0x1f4
[   10.656309]  device_release_driver_internal from
bus_remove_device+0xc0/0xe4
[   10.656320]  bus_remove_device from device_del+0x138/0x424
[   10.656333]  device_del from usb_disable_device+0xc4/0x170
[   10.656345]  usb_disable_device from usb_set_configuration+0x504/0x8e0
[   10.656358]  usb_set_configuration from usb_unbind_device+0x24/0x7c
[   10.656371]  usb_unbind_device from
device_release_driver_internal+0x180/0x1f4
[   10.656380]  device_release_driver_internal from device_reprobe+0x18/0x90
[   10.656391]  device_reprobe from __usb_bus_reprobe_drivers+0x40/0x6c
[   10.656407]  __usb_bus_reprobe_drivers from bus_for_each_dev+0x6c/0xb4
[   10.656421]  bus_for_each_dev from usb_register_device_driver+0x94/0xc8
[   10.656434]  usb_register_device_driver from
onboard_dev_init+0x14/0x1000 [onboard_usb_dev]
[   10.656460]  onboard_dev_init [onboard_usb_dev] from
do_one_initcall+0x40/0x1e0
[   10.656480]  do_one_initcall from do_init_module+0x50/0x1fc
[   10.656497]  do_init_module from init_module_from_file+0x90/0xbc
[   10.656513]  init_module_from_file from sys_finit_module+0x194/0x2b0
[   10.656528]  sys_finit_module from __sys_trace_return+0x0/0x10
[   10.656542] Exception stack(0xf1bf9fa8 to 0xf1bf9ff0)
[   10.656550] 9fa0:                   b6f5bf04 00000040 00000006
b6f5ad00 00000000 b6f5ba78
[   10.656556] 9fc0: b6f5bf04 00000040 6ebbc400 0000017b 006dac18
005a196b 005a19dc 006dbae0
[   10.656562] 9fe0: bee066c8 bee066b8 b6f52bc8 b6dfc580
[   10.656581] ---[ end trace 0000000000000000 ]---

Maybe some has any idea, how to fix this properly.

Best regards