net: sfp-bus: constify link_modes to sfp_select_interface()

sfp_select_interface() does not modify its link_modes argument, so
make this a const pointer.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Daniel Machon <daniel.machon@microchip.com>
Link: https://lore.kernel.org/r/E1s15s0-00AHyq-8E@rmk-PC.armlinux.org.ukSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/phy/sfp-bus.c

@@ -355,7 +355,7 @@ EXPORT_SYMBOL_GPL(sfp_parse_support);
  * modes mask.
  */
 phy_interface_t sfp_select_interface(struct sfp_bus *bus,
-				     unsigned long *link_modes)
+				     const unsigned long *link_modes)
 {
 	if (phylink_test(link_modes, 25000baseCR_Full) ||
 	    phylink_test(link_modes, 25000baseKR_Full) ||

include/linux/sfp.h

@@ -554,7 +554,7 @@ bool sfp_may_have_phy(struct sfp_bus *bus, const struct sfp_eeprom_id *id);
 void sfp_parse_support(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
 		       unsigned long *support, unsigned long *interfaces);
 phy_interface_t sfp_select_interface(struct sfp_bus *bus,
-				     unsigned long *link_modes);
+				     const unsigned long *link_modes);
 
 int sfp_get_module_info(struct sfp_bus *bus, struct ethtool_modinfo *modinfo);
 int sfp_get_module_eeprom(struct sfp_bus *bus, struct ethtool_eeprom *ee,
@@ -593,7 +593,7 @@ static inline void sfp_parse_support(struct sfp_bus *bus,
 }
 
 static inline phy_interface_t sfp_select_interface(struct sfp_bus *bus,
-						   unsigned long *link_modes)
+						const unsigned long *link_modes)
 {
 	return PHY_INTERFACE_MODE_NA;
 }