net: ethernet: ti: am65-cpsw: fix error handling in am65_cpsw_nuss_probe()

[ Upstream commit 46fb6512538d201d9a5b2bd7138b6751c37fdf0b ]

The am65_cpsw_nuss_cleanup_ndev() function calls unregister_netdev()
even if register_netdev() fails, which triggers WARN_ON(1) in
unregister_netdevice_many(). To fix it, make sure that
unregister_netdev() is called only on registered netdev.

Compile tested only.

Fixes: 84b4aa493249 ("net: ethernet: ti: am65-cpsw: add multi port support in mac-only mode")
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 901571c..2298b3c 100644 (file)
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -2054,7 +2054,7 @@ static void am65_cpsw_nuss_cleanup_ndev(struct am65_cpsw_common *common)
 
        for (i = 0; i < common->port_num; i++) {
                port = &common->ports[i];
-               if (port->ndev)
+               if (port->ndev && port->ndev->reg_state == NETREG_REGISTERED)
                        unregister_netdev(port->ndev);
        }
 }