From 1f970f590f969d5a3d8b9d458ae257bf93c00432 Mon Sep 17 00:00:00 2001
From: "Bryn M. Reeves" <bmr@redhat.com>
Date: Mon, 30 Sep 2019 17:10:05 +0100
Subject: [PATCH] dmsetup: do not treat no groups as an error in dmstats list
 --group

Analogous to the case of a device with no regions, it is not an
error to attempt to list the stats groups on a device that has no
configured groups: just return success and continue.
---
 tools/dmsetup.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/dmsetup.c b/tools/dmsetup.c
index 60e0638c8..15a09c628 100644
--- a/tools/dmsetup.c
+++ b/tools/dmsetup.c
@@ -941,10 +941,12 @@ static int _display_info_cols(struct dm_task *dmt, struct dm_info *info)
 		}
 	}
 
-	/* group report with no groups? */
+	/* Group report with no groups is not an error */
 	if ((walk_flags == DM_STATS_WALK_GROUP)
-	    && !dm_stats_get_nr_groups(obj.stats))
+	    && !dm_stats_get_nr_groups(obj.stats)) {
+		r = 1;
 		goto out;
+	}
 
 	dm_stats_walk_init(obj.stats, walk_flags);
 	dm_stats_walk_do(obj.stats) {