[openwrt/openwrt] ramips: ethernet: ralink: allow to return EPROBE_DEFER on switch_init

[LEDE Commits]

lynxis pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/74c58c9d5844d52e23a7fc52f4d45a5fedd06a2b

commit 74c58c9d5844d52e23a7fc52f4d45a5fedd06a2b
Author: Alexander Couzens <lynxis at fe80.eu>
AuthorDate: Wed Jun 2 00:01:53 2021 +0000

    ramips: ethernet: ralink: allow to return EPROBE_DEFER on switch_init
    
    For rt3050 the switch needs to be initialized before the ethernet start sending
    packets. Allow switch_init to return -EPROBE_DEFER.
    
    Signed-off-by: Alexander Couzens <lynxis at fe80.eu>
---
 .../linux/ramips/files/drivers/net/ethernet/ralink/mtk_eth_soc.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/target/linux/ramips/files/drivers/net/ethernet/ralink/mtk_eth_soc.c b/target/linux/ramips/files/drivers/net/ethernet/ralink/mtk_eth_soc.c
index 8a088bd5ce..cf6d4806ed 100644
--- a/target/linux/ramips/files/drivers/net/ethernet/ralink/mtk_eth_soc.c
+++ b/target/linux/ramips/files/drivers/net/ethernet/ralink/mtk_eth_soc.c
@@ -1376,11 +1376,16 @@ static int __init fe_init(struct net_device *dev)
 	else
 		fe_reset_fe(priv);
 
-	if (priv->soc->switch_init)
-		if (priv->soc->switch_init(priv)) {
+	if (priv->soc->switch_init) {
+		err = priv->soc->switch_init(priv);
+		if (err) {
+			if (err == -EPROBE_DEFER)
+				return err;
+
 			netdev_err(dev, "failed to initialize switch core\n");
 			return -ENODEV;
 		}
+	}
 
 	fe_reset_phy(priv);