CVE-2025-39771

In the Linux kernel, the following vulnerability has been resolved:

regulator: pca9450: Use devm_register_sys_off_handler

With module test, there is error dump:

------------[ cut here ]------------

notifier callback pca9450_i2c_restart_handler already registered

WARNING: kernel/notifier.c:23 at notifier_chain_register+0x5c/0x88,

CPU#0: kworker/u16:3/50

Call trace:

notifier_chain_register+0x5c/0x88 (P)

atomic_notifier_chain_register+0x30/0x58

register_restart_handler+0x1c/0x28

pca9450_i2c_probe+0x418/0x538

i2c_device_probe+0x220/0x3d0

really_probe+0x114/0x410

__driver_probe_device+0xa0/0x150

driver_probe_device+0x40/0x114

__device_attach_driver+0xd4/0x12c

So use devm_register_sys_off_handler to let kernel handle the resource

free to avoid kernel dump.