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From: Alexander Motin <mav@FreeBSD.org>
Date: Tue, 8 Nov 2016 20:58:25 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org
Subject: svn commit: r308448 -
 stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
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Author: mav
Date: Tue Nov  8 20:58:25 2016
New Revision: 308448
URL: https://svnweb.freebsd.org/changeset/base/308448

Log:
  MFC r307857: Fix panic after ZVOL renamed to name invalid for DEVFS.

Modified:
  stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c
==============================================================================
--- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c	Tue Nov  8 20:57:46 2016	(r308447)
+++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c	Tue Nov  8 20:58:25 2016	(r308448)
@@ -780,8 +780,10 @@ zvol_remove_zv(zvol_state_t *zv)
 		g_topology_lock();
 		zvol_geom_destroy(zv);
 		g_topology_unlock();
-	} else if (zv->zv_volmode == ZFS_VOLMODE_DEV)
-		destroy_dev(zv->zv_dev);
+	} else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
+		if (zv->zv_dev != NULL)
+			destroy_dev(zv->zv_dev);
+	}
 #endif
 
 	avl_destroy(&zv->zv_znode.z_range_avl);
@@ -2952,14 +2954,14 @@ zvol_rename_minor(zvol_state_t *zv, cons
 	} else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
 		struct make_dev_args args;
 
-		dev = zv->zv_dev;
-		ASSERT(dev != NULL);
-		zv->zv_dev = NULL;
-		destroy_dev(dev);
-		if (zv->zv_total_opens > 0) {
-			zv->zv_flags &= ~ZVOL_EXCL;
-			zv->zv_total_opens = 0;
-			zvol_last_close(zv);
+		if ((dev = zv->zv_dev) != NULL) {
+			zv->zv_dev = NULL;
+			destroy_dev(dev);
+			if (zv->zv_total_opens > 0) {
+				zv->zv_flags &= ~ZVOL_EXCL;
+				zv->zv_total_opens = 0;
+				zvol_last_close(zv);
+			}
 		}
 
 		make_dev_args_init(&args);