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

From: Zhang Changzhong
Date: Wed Nov 23 2022 - 21:43:50 EST


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@xxxxxxxxxx>
---
drivers/net/ethernet/ti/am65-cpsw-nuss.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index c50b137..d04a239 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -2082,7 +2082,7 @@ 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);
}
}
--
2.9.5