[dpdk-dev] [PATCH] ethdev: don't look for devices if none were found

[Anatoly Burakov <anatoly.burakov@intel.com>]

Aside from avoiding doing useless work, this also fixes a segfault
when calling rte_eth_dev_get_port_by_name() whenever no devices
were found yet, and therefore rte_eth_dev_data wasn't yet allocated.

Fixes: 9c5b8d8b9feb ("ethdev: clean port id retrieval when attaching")

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 lib/librte_ether/rte_ethdev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index fde8112..76a6dbf 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -376,6 +376,9 @@ rte_eth_dev_get_port_by_name(const char *name, uint8_t *port_id)
 		return -EINVAL;
 	}
 
+	if (!nb_ports)
+		return -ENODEV;
+
 	*port_id = RTE_MAX_ETHPORTS;
 
 	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
-- 
2.5.5