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Fixed

LIN1021-1860 : There is a calltrace when unbind the stmmac driver

Created: Oct 29, 2021 Updated: Nov 29, 2021

Resolved Date: Nov 10, 2021

Found In Version: 10.21.20.5

Fix Version: 10.21.20.7

Severity: Standard

Applicable for: Wind River Linux LTS 21

Component/s: Kernel

Description

When run below commands, there is a calltrace as below:
$ cd /sys/class/net/eth0/device/driver
$ echo ff800000.ethernet > unbind

WARNING: CPU: 3 PID: 386 at drivers/clk/clk.c:810 clk_core_unprepare+0x114/0x274
Modules linked in: sch_fq_codel
CPU: 3 PID: 386 Comm: sh Tainted: G        W         5.10.74-yocto-standard #1
Hardware name: SoCFPGA Stratix 10 SoCDK (DT)
pstate: 00000005 (nzcv daif -PAN -UAO -TCO BTYPE=--)
pc : clk_core_unprepare+0x114/0x274
lr : clk_core_unprepare+0x114/0x274
sp : ffff800011bdbb10
clk_core_unprepare+0x114/0x274
 clk_unprepare+0x38/0x50
 stmmac_remove_config_dt+0x40/0x80
 stmmac_pltfr_remove+0x64/0x80
 platform_drv_remove+0x38/0x60
 ... ..
 el0_sync_handler+0x1a4/0x1b0
 el0_sync+0x180/0x1c0

This issue had been resolved by correcting clock operation.

Steps to Reproduce

Build project using --machine intel-socfpga-64 and the attached kernel config.

$ cd /sys/class/net/etha01/device/driver
$ echo ff800000.ethernet > unbind

The results are in the attached log.