From: Fugang Duan <fugang.duan@nxp.com>
Date: Wed, 3 Jan 2018 10:39:30 +0800
Subject: net: fec: defer probe if regulator is not ready
Git-commit: 3f38c683033a9a0a2738e7067f449deefabfa3ef
Patch-mainline: v4.15-rc8
References: networking-stable-18_01_12

Defer probe if regulator is not ready. E.g. some regulator is fixed
regulator controlled by i2c expander gpio, the i2c device may be probed
after the driver, then it should handle the case of defer probe error.

Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/net/ethernet/freescale/fec_main.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -3432,6 +3432,10 @@ fec_probe(struct platform_device *pdev)
 			goto failed_regulator;
 		}
 	} else {
+		if (PTR_ERR(fep->reg_phy) == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			goto failed_regulator;
+		}
 		fep->reg_phy = NULL;
 	}