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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>
Commit 3f35146 added a check on the value returned by the
_display_info_cols() function:
1024 if (!_switches[COLS_ARG])
1025 _display_info_long(dmt, &info);
1026 else
1027 r = _display_info_cols(dmt, &info);
1028
1029 return r;
This exposes a bug in the dmstats code in _display_info_cols:
the fact that a device has no regions is explicitly not an error
(and is documented as such in the code), but since the return
code is not changed before leaving the function it is now treated
as an error leading to:
# dmstats list
Command failed.
When no regions exist.
Set the return code to the correct value before returning.
