[PATCH v2 1/2] mempool: fix rte_errno in rte_mempool_create_empty

[Ariel Otilibili]

When returning from rte_mempool_set_ops_byname(), rte_errno is not set
for error exits.

The API requires rte_errno to be set in that case.

Bugzilla ID: 1559
Fixes: c2c6b2f41305 ("mempool: fix default ops for an empty mempool")
Link: 
https://doc.dpdk.org/api/rte__mempool_8h.html#a82e301ee33ed7a263ceb4582655dc3ea
Signed-off-by: Ariel Otilibili <ariel.otilib...@6wind.com>
---
 lib/mempool/rte_mempool.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/mempool/rte_mempool.c b/lib/mempool/rte_mempool.c
index d8e39e5c2072..1e4f24783c0b 100644
--- a/lib/mempool/rte_mempool.c
+++ b/lib/mempool/rte_mempool.c
@@ -928,8 +928,10 @@ rte_mempool_create_empty(const char *name, unsigned n, 
unsigned elt_size,
        else
                ret = rte_mempool_set_ops_byname(mp, "ring_mp_mc", NULL);
 
-       if (ret)
+       if (ret) {
+               rte_errno = -ret;
                goto exit_unlock;
+       }
 
        /*
         * local_cache pointer is set even if cache_size is zero.
-- 
2.30.2