From eed70fd9452fe0fcd1a221731a4333b51a8081f2 Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Fri, 3 Jan 2020 15:13:56 +0000
Subject: [PATCH] net: phylink: fix failure to register on x86 systems
Git-commit: eed70fd9452fe0fcd1a221731a4333b51a8081f2
Patch-mainline: v5.5-rc6
References: git-fixes

The kernel test robot reports a boot failure with qemu in 5.5-rc,
referencing commit 2203cbf2c8b5 ("net: sfp: move fwnode parsing into
sfp-bus layer"). This is caused by phylink_create() being passed a
NULL fwnode, causing fwnode_property_get_reference_args() to return
-EINVAL.

Don't attempt to attach to a SFP bus if we have no fwnode, which
avoids this issue.

Reported-by: kernel test robot <rong.a.chen@intel.com>
Fixes: 2203cbf2c8b5 ("net: sfp: move fwnode parsing into sfp-bus layer")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/phy/phylink.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 1585eebb73fe..ee7a718662c6 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -566,6 +566,9 @@ static int phylink_register_sfp(struct phylink *pl,
 	struct sfp_bus *bus;
 	int ret;
 
+	if (!fwnode)
+		return 0;
+
 	bus = sfp_bus_find_fwnode(fwnode);
 	if (IS_ERR(bus)) {
 		ret = PTR_ERR(bus);
-- 
2.16.4