From: Anatoly Burakov <anatoly.burakov@intel.com>
Date: Sat, 19 Nov 2016 13:10:11 +0000 (+0000)
Subject: ethdev: fix port lookup if none
X-Git-Tag: spdx-start~5290
X-Git-Url: http://git.droids-corp.org/?p=dpdk.git;a=commitdiff_plain;h=f9ae888b1e19face2ce02e92936f793499c11956

ethdev: fix port lookup if none

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>
Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>
---

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 4209ad0d7b..1e0f206101 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++) {