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From: Sepherosa Ziehau <sephe@FreeBSD.org>
Date: Fri, 4 Nov 2016 01:14:41 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r308278 - head/sys/dev/hyperv/vmbus
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Author: sephe
Date: Fri Nov  4 01:14:41 2016
New Revision: 308278
URL: https://svnweb.freebsd.org/changeset/base/308278

Log:
  hyperv/vmbus: Reset ch_dev, once the child is deleted.
  
  So it will not be mis-used later on, e.g. in vmbus_chan_printf().
  
  Submitted by:	dexuan
  Reported by:	dexuan
  MFC after:	1 week
  Sponsored by:	Microsoft

Modified:
  head/sys/dev/hyperv/vmbus/vmbus.c

Modified: head/sys/dev/hyperv/vmbus/vmbus.c
==============================================================================
--- head/sys/dev/hyperv/vmbus/vmbus.c	Fri Nov  4 01:12:32 2016	(r308277)
+++ head/sys/dev/hyperv/vmbus/vmbus.c	Fri Nov  4 01:14:41 2016	(r308278)
@@ -954,6 +954,7 @@ vmbus_delete_child(struct vmbus_channel 
 	if (chan->ch_dev != NULL) {
 		error = device_delete_child(chan->ch_vmbus->vmbus_dev,
 		    chan->ch_dev);
+		chan->ch_dev = NULL;
 	}
 	mtx_unlock(&Giant);
 	return (error);