[PATCH 20.11] net/nfp: fix reconfigure logic of set MAC address

[Chaoyong He]

[ upstream commit d67022275d3b423850c629036d33fdfadeb874a8 ]

If the reconfigure API exit abnormally, the value in the config bar
will not same with the value stored in the data structure.

Fix this by add a local variable to hold the temporary value and the
logic of store it when no error happen.

Fixes: 2fe669f4bcd2 ("net/nfp: support MAC address change")

Signed-off-by: Chaoyong He <chaoyong.he at corigine.com>
---
 drivers/net/nfp/nfp_net.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/nfp/nfp_net.c b/drivers/net/nfp/nfp_net.c
index 102d8f2938..ac2c99e547 100644
--- a/drivers/net/nfp/nfp_net.c
+++ b/drivers/net/nfp/nfp_net.c
@@ -537,7 +537,7 @@ int
 nfp_set_mac_addr(struct rte_eth_dev *dev, struct rte_ether_addr *mac_addr)
 {
 	struct nfp_net_hw *hw;
-	uint32_t update, ctrl;
+	uint32_t update, new_ctrl;
 
 	hw = NFP_NET_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 	if ((hw->ctrl & NFP_NET_CFG_CTRL_ENABLE) &&
@@ -552,14 +552,17 @@ nfp_set_mac_addr(struct rte_eth_dev *dev, struct rte_ether_addr *mac_addr)
 
 	/* Signal the NIC about the change */
 	update = NFP_NET_CFG_UPDATE_MACADDR;
-	ctrl = hw->ctrl;
+	new_ctrl = hw->ctrl;
 	if ((hw->ctrl & NFP_NET_CFG_CTRL_ENABLE) &&
 	    (hw->cap & NFP_NET_CFG_CTRL_LIVE_ADDR))
-		ctrl |= NFP_NET_CFG_CTRL_LIVE_ADDR;
-	if (nfp_net_reconfig(hw, ctrl, update) < 0) {
+		new_ctrl |= NFP_NET_CFG_CTRL_LIVE_ADDR;
+	if (nfp_net_reconfig(hw, new_ctrl, update) < 0) {
 		PMD_INIT_LOG(INFO, "MAC address update failed");
 		return -EIO;
 	}
+
+	hw->ctrl = new_ctrl;
+
 	return 0;
 }
 
-- 
2.39.1