netdev - smsc95xx warning after a 'reboot' command

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Date:   Wed, 2 Mar 2022 18:57:06 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Steve Glendinning <steve.glendinning@...well.net>,
        UNGLinuxDriver@...rochip.com
Cc:     netdev <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>
Subject: smsc95xx warning after a 'reboot' command

Hi,

On a imx8mm iotgateway board from Compulab running 5.10 or 5.17-rc the
following warning is observed after a 'reboot' command:

[   23.077179] ci_hdrc ci_hdrc.1: remove, state 1
[   23.081674] usb usb2: USB disconnect, device number 1
[   23.086740] usb 2-1: USB disconnect, device number 2
[   23.088393] smsc95xx 2-1.1:1.0 eth1: Failed to read reg index 0x00000114: -19
[   23.091718] usb 2-1.1: USB disconnect, device number 3
[   23.094090] smsc95xx 2-1.1:1.0 eth1: unregister 'smsc95xx'
usb-ci_hdrc.1-1.1, smsc95xx USB 2.0 Ethernet
[   23.098869] smsc95xx 2-1.1:1.0 eth1: Error reading MII_ACCESS
[   23.098877] smsc95xx 2-1.1:1.0 eth1: __smsc95xx_mdio_read: MII is busy
[   23.125763] ------------[ cut here ]------------
[   23.125860] smsc95xx 2-1.1:1.0 eth1: Failed to read reg index 0x00000114: -19
[   23.130393] WARNING: CPU: 3 PID: 119 at drivers/net/phy/phy.c:958
phy_error+0x14/0x60
[   23.130397] Modules linked in:
[   23.137550] smsc95xx 2-1.1:1.0 eth1: Error reading MII_ACCESS
[   23.145367]  iwlmvm mac80211 libarc4
[   23.148439] smsc95xx 2-1.1:1.0 eth1: __smsc95xx_mdio_read: MII is busy
[   23.154175]  af_alg caam_jr caamhash_desc caamalg_desc
crypto_engine rng_core authenc libdes btusb hci_uart btrtl btintel
btqca crct10dif_ce btbcm fsl_imx8_ddr_perf bluetooth ecdh_generic ecc
spi_imx spi_bitbang clk_bd718x7 at24 caam error rtc_snvs snvs_pwrkey
imx8mm_thermal imx_cpufreq_dt pwm_bl overlay iwlwifi cfg80211 rfkill
ipv6
[   23.193841] CPU: 3 PID: 119 Comm: kworker/u8:2 Not tainted
5.10.102-stable-standard #1
[   23.201764] Hardware name: CompuLab i.MX8MM IoT Gateway (DT)
[   23.207433] Workqueue: events_power_efficient phy_state_machine
[   23.213362] pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--)
[   23.219375] pc : phy_error+0x14/0x60
[   23.222954] lr : phy_state_machine+0x88/0x218
[   23.227315] sp : ffff800011743d20
[   23.230631] x29: ffff800011743d20 x28: ffff800011207000
[   23.235952] x27: ffff000000008070 x26: ffff000000008020
[   23.241273] x25: 0000000000000000 x24: 00000000ffffffed
[   23.246595] x23: ffff0000002e44e8 x22: ffff000000161c80
[   23.251915] x21: ffff0000002e4000 x20: 0000000000000005
[   23.257238] x19: ffff0000002e4000 x18: 0000000000000010
[   23.262558] x17: 0000000000000000 x16: 0000000000000000
[   23.267878] x15: 0000000e9816052e x14: 0000000000000000
[   23.273198] x13: 000000000000002f x12: 0000000000000198
[   23.278518] x11: 000000000000c6f5 x10: 000000000000c6f5
[   23.283838] x9 : 0000000000000000 x8 : ffff00007fbbc0c0
[   23.289161] x7 : ffff00007fbbb600 x6 : 0000000000000000
[   23.294481] x5 : 0000000000000008 x4 : 0000000000000000
[   23.299801] x3 : ffff0000002e44e8 x2 : 0000000000000000
[   23.305121] x1 : ffff000000161c80 x0 : ffff0000002e4000
[   23.310442] Call trace:
[   23.312894]  phy_error+0x14/0x60
[   23.316125]  phy_state_machine+0x88/0x218
[   23.320144]  process_one_work+0x1bc/0x338
[   23.324158]  worker_thread+0x50/0x420
[   23.327826]  kthread+0x140/0x160
[   23.331061]  ret_from_fork+0x10/0x34
[   23.334639] ---[ end trace 2cf86ece81b89776 ]---
[   23.339391] smsc95xx 2-1.1:1.0 eth1: Failed to read reg index 0x00000114: -19
[   23.346550] smsc95xx 2-1.1:1.0 eth1: Error reading MII_ACCESS
[   23.352312] smsc95xx 2-1.1:1.0 eth1: __smsc95xx_mdio_read: MII is busy
[   23.358863] smsc95xx 2-1.1:1.0 eth1: hardware isn't capable of remote wakeup
[   23.384599] usb 2-1.4: USB disconnect, device number 4
[   23.394062] ci_hdrc ci_hdrc.1: USB bus 2 deregistered
[   23.401921] ci_hdrc ci_hdrc.0: remove, state 4
[   23.406444] usb usb1: USB disconnect, device number 1
[   23.412082] ci_hdrc ci_hdrc.0: USB bus 1 deregistered
[   23.438063] imx2-wdt 30280000.watchdog: Device shutdown: Expect reboot!
[   23.444895] reboot: Restarting system

Would anyone have any suggestions to fix this?

Thanks