[src/netbsd-9]: src/sys/dev/usb Pull up following revision(s) (requested by m...

[martin <martin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/3166d455fe47
branches:  netbsd-9
changeset: 964215:3166d455fe47
user:      martin <martin%NetBSD.org@localhost>
date:      Sat Dec 12 12:56:40 2020 +0000

description:
Pull up following revision(s) (requested by mrg in ticket #1147):

        sys/dev/usb/ucom.c: revision 1.128

properly wait for refcounts to drain.
fixes panic at detach that jmnceill saw.

XXX: pullup-[89].

diffstat:

 sys/dev/usb/ucom.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r b68aac898ba8 -r 3166d455fe47 sys/dev/usb/ucom.c
--- a/sys/dev/usb/ucom.c        Fri Dec 11 15:44:07 2020 +0000
+++ b/sys/dev/usb/ucom.c        Sat Dec 12 12:56:40 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ucom.c,v 1.125 2019/05/09 02:43:35 mrg Exp $   */
+/*     $NetBSD: ucom.c,v 1.125.2.1 2020/12/12 12:56:40 martin Exp $    */
 
 /*
  * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ucom.c,v 1.125 2019/05/09 02:43:35 mrg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ucom.c,v 1.125.2.1 2020/12/12 12:56:40 martin Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_usb.h"
@@ -434,7 +434,7 @@
        }
 
        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);