net: phy: fix reading fixed phy status

With the switch to phy_resolve_aneg_linkmode() we don't read from the
chip any longer what is advertised but use phydev->advertising directly.
For a fixed phy however this bitmap is empty so far, what results in
no common mode being found. This breaks DSA. Fix this by advertising
everything that is supported. For a normal phy this done by phy_probe().

Fixes: 5502b218e001 ("net: phy: use phy_resolve_aneg_linkmode in genphy_read_status")
Signed-off-by: Heiner Kallweit <[e-mail]>
Tested-by: Andrew Lunn <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/phy/fixed_phy.c

···
 #include <linux/seqlock.h>
 #include <linux/idr.h>
 #include <linux/netdevice.h>
+#include <linux/linkmode.h>
 
 #include "swphy.h"
 
···
 		linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
 				 phy->supported);
 	}
+
+	linkmode_copy(phy->advertising, phy->supported);
 
 	ret = phy_device_register(phy);
 	if (ret) {