net: phylink: fix failure to register on x86 systems

The kernel test robot reports a boot failure with qemu in 5.5-rc,
referencing commit 283837fa15ba ("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: 283837fa15ba ("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>

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 1585eebb73feb79998731807809f522a08e2df11..ee7a718662c6b4d56da00ad947f85e50d86db537 100644 (file)
--- 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);