kern/59276: Detach driver if a module later provides a higher-priority match

[paul%whooppee.com@localhost]

>Number:         59276
>Category:       kern
>Synopsis:       Detach driver if a module later provides a higher-priority match
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Thu Apr 10 23:30:01 +0000 2025
>Originator:     Paul Goyette
>Release:        NetBSD 10.99.12
>Organization:
+---------------------+--------------------------+----------------------+
| Paul Goyette (.sig) | PGP Key fingerprint:     | E-mail addresses:    |
| (Retired)           | 1B11 1849 721C 56C8 F63A | paul%whooppee.com@localhost    |
| Software Developer  | 6E2E 05FD 15CE 9F2D 5102 | pgoyette%netbsd.org@localhost  |
| & Network Engineer  |                          | pgoyette99%gmail.com@localhost |
+---------------------+--------------------------+----------------------+
>Environment:
	
	
System: NetBSD speedy.whooppee.com 10.99.12 NetBSD 10.99.12 (SPEEDY 2025-04-10 11:38:52 UTC) #0: Thu Apr 10 13:10:16 UTC 2025 paul%speedy.whooppee.com@localhost:/build/netbsd-local/obj/amd64/sys/arch/amd64/compile/SPEEDY amd64
Architecture: x86_64
Machine: amd64
>Description:
We need a way for bus that is being rescanned to check if any of its
already-attached children have been "superseded" by a higher priority
match (which can happen with a newly-loading driver module).  If a
higher-priority device driver is now available it may need to evict
the current driver (assuming the current driver allows itself to be
detached).

See kern/59253 for a specific example.
	
>How-To-Repeat:
	
>Fix:
	

>Unformatted: