md disk fault communication code

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when disk is removed with out mdadm as I see from the stack below the
communication reaching the md driver.

dump_stack+0x49/0x5e
md_error+0x50/0x110 [md_mod]
state_store+0x43/0x300 [md_mod]
rdev_attr_store+0xad/0xd0 [md_mod]
? sysfs_write_file+0x62/0x1c0
sysfs_write_file+0x138/0x1c0
vfs_write+0xc0/0x1e0
SyS_write+0x5a/0xa0
? __audit_syscall_exit+0x246/0x2f0
system_call_fastpath+0x16/0x1b

could someone point me to the code which is monitoring scsi disks
status and thus calling md driver sysfs interface accordingly ?

Thx.
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