git: kernel/linker: preserve refs after unload veto

[Aaron LI]

commit e8a1da77a8648711f19f3d9736b7a813ad5ee6b4
Author: Leding Li <lileding at gmail.com>
Date:   Sat Jul 11 04:23:34 2026 +0800

    kernel/linker: preserve refs after unload veto
    
    linker_file_unload() used to take a temporary file reference (file->refs)
    before notifying modules to unload [1].  Its veto path dropped that
    temporary reference before returning the error.
    
    The 2009 linker code sync with FreeBSD [2] removed the temporary
    reference but retained the decrement.  Therefore, every failed kldunload
    reduced 'file->refs' even though the file remained loaded, allowing
    repeated EBUSY returns to drive the count below zero.
    
    Keep the existing reference when a module vetoes unload.  sys_kldunload()
    already restores userrefs on error, and a later unload attempt can retry
    with both counters unchanged.
    
    [1] Handle recursive situations a bit more robustly ...
        commit e7a2d40362352344eff1c4f395caf0a735e00a3e
    [2] modules: pull in most of FreeBSD's module linker changes
        commit 1c0e32863e0583221e430c22c1c68a023fd16195
    
    GitHub-PR: #50

Summary of changes:
 sys/kern/kern_linker.c | 1 -
 1 file changed, 1 deletion(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/e8a1da77a8648711f19f3d9736b7a813ad5ee6b4


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