[Bug 261071] snd_midi: unit 0 cannot have 2 or more channels

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 10 Jan 2022 03:30:28 UTC

            Bug ID: 261071
           Summary: snd_midi: unit 0 cannot have 2 or more channels
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: masatic.bsd@e-koubou.net

Created attachment 230855
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=230855&action=edit
patch, for 13.0-Release-p4

midi_init uses 0 as auto-allocate unit number, but unit 0 is also a valid unit
This confliction makes secondary function call to allocate another channel for
unit 0 is treated as auto-allocate and returns non-0 unit as result
Attached patch fixes this problem, auto-allocate number is changed from 0 to

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