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Subject[BUG] hwmon: (adt7470) warning when removing the module
I found a bug when removing the adt7470 module.

The following log can reveal it:

[ 18.459479] ------------[ cut here ]------------
[ 18.459852] do not call blocking ops when !TASK_RUNNING; state=1
set at [<ffffffffa006052b>] adt7470_update_thread+0x7b/0x130 [adt7470]
[ 18.460857] WARNING: CPU: 7 PID: 365 at kernel/sched/core.c:9660
__might_sleep+0x96/0xb0
[ 18.461523] Modules linked in: adt7470(-)
[ 18.464568] RIP: 0010:__might_sleep+0x96/0xb0
[ 18.472577] Call Trace:
[ 18.472778] <TASK>
[ 18.472957] exit_signals+0x2f/0x3b0
[ 18.473251] do_exit+0xcd/0x18c0
[ 18.473534] ? __mutex_unlock_slowpath+0x1b8/0x740
[ 18.473927] kthread_exit+0x42/0x60
[ 18.474212] ? adt7470_detect+0x140/0x140 [adt7470]
[ 18.474622] kthread+0x272/0x2e0
[ 18.474885] ? adt7470_detect+0x140/0x140 [adt7470]
[ 18.475277] ? kthread_blkcg+0xa0/0xa0
[ 18.475601] ret_from_fork+0x22/0x30
[ 18.475901] </TASK>

Regards,
Zheyu Ma

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