net: phy: leds: Don't make our own link speed names

The phy core provides a handy phy_speed_to_str() helper, so use that
instead of doing our own formatting of the different known link speeds.
To do this, increase PHY_LED_TRIGGER_SPEED_SUFFIX_SIZE to 11 so we can fit
'Unsupported' if necessary.

Signed-off-by: Kyle Roeschley <kyle.roeschley@ni.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/phy_led_triggers.c

@@ -67,7 +67,7 @@ void phy_led_trigger_change_speed(struct phy_device *phy)
 EXPORT_SYMBOL_GPL(phy_led_trigger_change_speed);
 
 static void phy_led_trigger_format_name(struct phy_device *phy, char *buf,
-					size_t size, char *suffix)
+					size_t size, const char *suffix)
 {
 	snprintf(buf, size, PHY_ID_FMT ":%s",
 		 phy->mdio.bus->id, phy->mdio.addr, suffix);
@@ -77,20 +77,9 @@ static int phy_led_trigger_register(struct phy_device *phy,
 				    struct phy_led_trigger *plt,
 				    unsigned int speed)
 {
-	char name_suffix[PHY_LED_TRIGGER_SPEED_SUFFIX_SIZE];
-
 	plt->speed = speed;
-
-	if (speed < SPEED_1000)
-		snprintf(name_suffix, sizeof(name_suffix), "%dMbps", speed);
-	else if (speed == SPEED_2500)
-		snprintf(name_suffix, sizeof(name_suffix), "2.5Gbps");
-	else
-		snprintf(name_suffix, sizeof(name_suffix), "%dGbps",
-			 DIV_ROUND_CLOSEST(speed, 1000));
-
 	phy_led_trigger_format_name(phy, plt->name, sizeof(plt->name),
-				    name_suffix);
+				    phy_speed_to_str(speed));
 	plt->trigger.name = plt->name;
 
 	return led_trigger_register(&plt->trigger);

include/linux/phy_led_triggers.h

@@ -20,7 +20,7 @@ struct phy_device;
 #include <linux/leds.h>
 #include <linux/phy.h>
 
-#define PHY_LED_TRIGGER_SPEED_SUFFIX_SIZE	10
+#define PHY_LED_TRIGGER_SPEED_SUFFIX_SIZE	11
 
 #define PHY_LINK_LED_TRIGGER_NAME_SIZE (MII_BUS_ID_SIZE + \
 				       FIELD_SIZEOF(struct mdio_device, addr)+\