[Bug 206297] mt - status incorrectly reports "door open" as "device not configured"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206297

            Bug ID: 206297
           Summary: mt - status incorrectly reports "door open" as "device
                    not configured"
           Product: Base System
           Version: 10.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: andrew at grillet.co.uk

mt -f /dev/sa0 status
- when no tape is loaded, reports "device not configured" when there is no tape
present. 

The message "device not configured" appears to suggest that there is a major
hardware or software defect, when "tape not loaded" or "door open" is a
perfectly normal state for a tape drive. I would expect a message like "door
open", "media not present" or "No tape loaded".

This applies to all SCSI LTOx, DDSx and DATx drives, (have tested all
generations of LTO 1 to 4, DDS 2 to 4, and also USB DAT72 drives (I don't have
any other working drives at present to test).

This is a pretty serious defect in terms of consequences: I have tested on
i386, but previously tested on Sparc and Sparc64, and assumed that the SCSI
driver defective on the basis of this message! (So I moved those machines to
OpenBSD, and the i386 machines to Linux).

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