ethtool: make validate_speed accept all speeds between 0 and INT_MAX

BugLink: http://bugs.launchpad.net/bugs/1581132

Devices these days can have any speed and as was recently pointed out
any speed from 0 to INT_MAX is valid so adjust speed validation to
accept such values.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit e02564ee)
Signed-off-by: Andy Gospodarek <gospo@cumulusnetworks.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

include/uapi/linux/ethtool.h

@@ -1318,24 +1318,7 @@ enum ethtool_sfeatures_retval_bits {
 
 static inline int ethtool_validate_speed(__u32 speed)
 {
-	switch (speed) {
-	case SPEED_10:
-	case SPEED_100:
-	case SPEED_1000:
-	case SPEED_2500:
-	case SPEED_5000:
-	case SPEED_10000:
-	case SPEED_20000:
-	case SPEED_25000:
-	case SPEED_40000:
-	case SPEED_50000:
-	case SPEED_56000:
-	case SPEED_100000:
-	case SPEED_UNKNOWN:
-		return 1;
-	}
-
-	return 0;
+	return speed <= INT_MAX || speed == SPEED_UNKNOWN;
 }
 
 /* Duplex, half or full. */