[dpdk-dev] [PATCH v1] lib/metrics: fix silent fail when uninitialised

[Remy Horton <remy.horton@intel.com>]

If rte_metrics_init() had not been called and hence the internal
metric storage is not allocated, rte_metrics_get_values() and
rte_metrics_get_name() would silently fail by returning zero
(i.e. no metrics registered). This patch changes the result of
this scenario to an explicit fail by returning -EIO.

Fixes: 349950ddb9c5 ("metrics: add information metrics library")

Signed-off-by: Remy Horton <remy.horton@intel.com>
---
 lib/librte_metrics/rte_metrics.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/lib/librte_metrics/rte_metrics.c b/lib/librte_metrics/rte_metrics.c
index 258f058..fed0a33 100644
--- a/lib/librte_metrics/rte_metrics.c
+++ b/lib/librte_metrics/rte_metrics.c
@@ -200,9 +200,8 @@ rte_metrics_get_names(struct rte_metric_name *names,
 	int return_value;
 
 	memzone = rte_memzone_lookup(RTE_METRICS_MEMZONE_NAME);
-	/* If not allocated, fail silently */
 	if (memzone == NULL)
-		return 0;
+		return -EIO;
 
 	stats = memzone->addr;
 	rte_spinlock_lock(&stats->lock);
@@ -238,9 +237,9 @@ rte_metrics_get_values(int port_id,
 		return -EINVAL;
 
 	memzone = rte_memzone_lookup(RTE_METRICS_MEMZONE_NAME);
-	/* If not allocated, fail silently */
 	if (memzone == NULL)
-		return 0;
+		return -EIO;
+
 	stats = memzone->addr;
 	rte_spinlock_lock(&stats->lock);
 
-- 
2.9.5