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properly wait for refcounts to drain. 

fixes panic at detach that jmnceill saw.

XXX: pullup-[89].
This commit is contained in:
mrg 2020-10-26 12:24:10 +00:00
parent 806767e6ce
commit 7fd6f3bfcf
1 changed files with 3 additions and 3 deletions
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6
sys/dev/usb/ucom.c
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@ -1,4 +1,4 @@
/* $NetBSD: ucom.c,v 1.127 2020/03/14 02:35:33 christos Exp $ */
/* $NetBSD: ucom.c,v 1.128 2020/10/26 12:24:10 mrg Exp $ */
/*
* Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
@ -34,7 +34,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ucom.c,v 1.127 2020/03/14 02:35:33 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: ucom.c,v 1.128 2020/10/26 12:24:10 mrg Exp $");
#ifdef _KERNEL_OPT
#include "opt_usb.h"
@ -434,7 +434,7 @@ ucom_detach(device_t self, int flags)
}
sc->sc_refcnt--;
while (sc->sc_refcnt > 0) {
while (sc->sc_refcnt >= 0) {
/* Wake up anyone waiting */
if (tp != NULL) {
mutex_spin_enter(&tty_lock);