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khelp: suppress useless warning message on shutdown

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If a module (e.g. the ertt hhook for TCP) can't clean up at
shutdown, there is nothing to be done about it.  In the ertt case,
cleanup is just shutting down a UMA zone, which doesn't need to be
done.  Suppress EBUSY warnings on shutdown.

PR:		271677
Reviewed by:	tuexen, imp
Differential Revision:	https://reviews.freebsd.org/D42650

(cherry picked from commit 415c1c748d)
This commit is contained in:
Mike Karels 2023-11-17 12:51:18 -06:00
parent 94bddd2ab7
commit 3569e21f07
1 changed files with 1 additions and 1 deletions
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2
sys/kern/kern_khelp.c
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@ -357,7 +357,7 @@ khelp_modevent(module_t mod, int event_type, void *data)
} else if (error == ENOENT)
/* Do nothing and allow unload if helper not in list. */
error = 0;
else if (error == EBUSY)
else if (error == EBUSY && event_type != MOD_SHUTDOWN)
printf("Khelp module \"%s\" can't unload until its "
"refcount drops from %d to 0.\n", kmd->name,
kmd->helper->h_refcount);