https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192257
Bug ID: 192257
Summary: modevent_nop always returns EBUSY on MOD_UNLOAD;
blocks user from being able to unload modules with
evhand = NULL
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: yaneurab...@gmail.com
The code in modevent_nop always returns EBUSY when one tries to unload a
module. This doesn't necessarily make sense because it effectively wires the
module into the kernel until it's rebooted, making it difficult for
developers/testers/users to swap out kernel modules as need be:
68 static int
69 modevent_nop(module_t mod, int what, void *arg)
70 {
71
72 switch(what) {
73 case MOD_LOAD:
74 return (0);
75 case MOD_UNLOAD:
76 return (EBUSY);
77 default:
78 return (EOPNOTSUPP);
79 }
80 }
It would make more sense if it returned 0 when MOD_LOAD/MOD_UNLOAD events are
passed through, like it used to before r132167, but this requires additional
discussion.
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