[dpdk-stable] patch 'metrics: do not fail silently when uninitialised' has been queued to LTS release 17.11.4

[Yongseok Koh]

Hi,

FYI, your patch has been queued to LTS release 17.11.4

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 07/28/18. So please
shout if anyone has objections.

Thanks.

Yongseok

---
>From 2191a73c5584a610d097f34fb8b419c666255488 Mon Sep 17 00:00:00 2001
From: Remy Horton <remy.horton at intel.com>
Date: Mon, 2 Jul 2018 15:55:47 +0100
Subject: [PATCH] metrics: do not fail silently when uninitialised

[ upstream commit a84bdf6a101f2ab3c3859a40f366962d78c12868 ]

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 at 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 26c65b173..3ddf9caa4 100644
--- a/lib/librte_metrics/rte_metrics.c
+++ b/lib/librte_metrics/rte_metrics.c
@@ -236,9 +236,8 @@ 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);
@@ -274,9 +273,9 @@ 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);
 
-- 
2.11.0