dmsetup: fix stats report command output

Since the stats handle is neither bound nor listed before the
attempt to call dm_stats_get_nr_regions(), it will always return
zero: this prevents reporting of any dmstats regions on any
device.

Remove the dm_stats_get_nr_regions() check and instead rely on
the correct return status from dm_stats_populate() which only
returns 0 in the case that there are regions to inspect (and
which logs a specific error for all other cases).

Reported-by: Bryan Gurney <bgurney@redhat.com>

1 files changed, 3 insertions, 7 deletions

diff --git a/tools/dmsetup.c b/tools/dmsetup.c
index 3cdf8622b..0b5b808db 100644
--- a/tools/dmsetup.c
+++ b/tools/dmsetup.c
@@ -910,17 +910,13 @@ static int _display_info_cols(struct dm_task *dmt, struct dm_info *info)
 		if (!(obj.stats = dm_stats_create(DM_STATS_PROGRAM_ID)))
 			goto_out;
 
-		if (!dm_stats_get_nr_regions(obj.stats)) {
-			log_debug("Skipping %s with no regions.", dm_task_get_name(dmt));
+		dm_stats_bind_devno(obj.stats, info->major, info->minor);
+
+		if (!dm_stats_populate(obj.stats, _program_id, DM_STATS_REGIONS_ALL)) {
 			r = 1;
 			goto out;
 		}
 
-		dm_stats_bind_devno(obj.stats, info->major, info->minor);
-
-		if (!dm_stats_populate(obj.stats, _program_id, DM_STATS_REGIONS_ALL))
-			goto_out;
-
 		/* Update timestamps and handle end-of-interval accounting. */
 		_update_interval_times();