[Bug 276303] camcontrol stop does not stop a USB-connected SATA drive (regression from 12.4)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276303

            Bug ID: 276303
           Summary: camcontrol stop does not stop a USB-connected SATA
                    drive (regression from 12.4)
           Product: Base System
           Version: 14.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: d8zNeCFG@aon.at

Scenario:
- FreeBSD stable/14 at c87b594732d7 + very few local patches
- WD My Book 12TB external drive
https://www.westerndigital.com/products/external-drives/wd-my-book-usb-3-0-hdd?sku=WDBBGB0120HBK-NESN
- running "camcontrol stop da0

Result:
- The drive continues spinning and is immediately responsive to subsequent read
commands.

Expected result:
- The drive should spin down and enter a lower-power state.
- This worked successfully in FreeBSD 12.4.

Notes:
- In 12.4, after the drive entered the low-power state, there would be a delay
of several seconds between the time external power to the drive was
disconnected and the device being removed from /dev. In stable/14, when
disconnecting the external power supply, the device entry is removed
immediately. This corroborates the assumption that the drive does not enter a
low-power state at all.
- The purpose of executing the "stop" command before removing external power is
to ensure that the drive heads are parked and to reduce wear & tear on the
drive.

-- Martin

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