From 5ee1ac46456da10a24fd822d1bb27dd0b816b488 Mon Sep 17 00:00:00 2001
From: Tai-hwa Liang <avatar@FreeBSD.org>
Date: Tue, 10 Jul 2007 09:23:10 +0000
Subject: [PATCH] Fixing the mount_smbfs(8) hanging by utilising the
 destroy_dev_sched() KPI.

Relevant threads:

  http://lists.freebsd.org/pipermail/freebsd-current/2007-June/074329.html

Reviewed by:	kib, bp (slightly different version)
Tested by:	Yuri Pankov <yuri.pankov at gmail dot com>,
		Jiawei Ye <leafy7382 at gmail dot com>
Approved by:	re (kensmith)
---
 sys/netsmb/smb_dev.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/netsmb/smb_dev.c b/sys/netsmb/smb_dev.c
index 850f0ad018df..3181438b4657 100644
--- a/sys/netsmb/smb_dev.c
+++ b/sys/netsmb/smb_dev.c
@@ -175,7 +175,7 @@ nsmb_dev_close(struct cdev *dev, int flag, int fmt, struct thread *td)
 */
 	dev->si_drv1 = NULL;
 	free(sdp, M_NSMBDEV);
-	destroy_dev(dev);
+	destroy_dev_sched(dev);
 	splx(s);
 	return 0;
 }
@@ -349,6 +349,8 @@ nsmb_dev_load(module_t mod, int cmd, void *arg)
 		if (error)
 			break;
 		EVENTHANDLER_DEREGISTER(dev_clone, nsmb_dev_tag);
+		drain_dev_clone_events();
+		destroy_dev_drain(&nsmb_cdevsw);
 		printf("netsmb_dev: unloaded\n");
 		break;
 	    default: