ethtool: fix error handling in ethtool_phys_id

If ops->set_phys_id() returned an error, previously we would only break
out of the inner loop, which neither stopped the outer loop nor returned
the error to the user (since 'rc' would be overwritten on the next pass
through the loop).
Thus, rewrite it to use a single loop, so that the break does the right
thing. Use u64 for 'count' and 'i' to prevent overflow in case of
(unreasonably) large values of id.data and n.

Signed-off-by: Edward Cree <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ethtool/ioctl.c

···
 			id.data ? (id.data * HZ) : MAX_SCHEDULE_TIMEOUT);
 	} else {
 		/* Driver expects to be called at twice the frequency in rc */
-		int n = rc * 2, i, interval = HZ / n;
+		int n = rc * 2, interval = HZ / n;
+		u64 count = n * id.data, i = 0;
 
-		/* Count down seconds */
 		do {
-			/* Count down iterations per second */
-			i = n;
-			do {
-				rtnl_lock();
-				rc = ops->set_phys_id(dev,
-				    (i & 1) ? ETHTOOL_ID_OFF : ETHTOOL_ID_ON);
-				rtnl_unlock();
-				if (rc)
-					break;
-				schedule_timeout_interruptible(interval);
-			} while (!signal_pending(current) && --i != 0);
-		} while (!signal_pending(current) &&
-			 (id.data == 0 || --id.data != 0));
+			rtnl_lock();
+			rc = ops->set_phys_id(dev,
+				    (i++ & 1) ? ETHTOOL_ID_OFF : ETHTOOL_ID_ON);
+			rtnl_unlock();
+			if (rc)
+				break;
+			schedule_timeout_interruptible(interval);
+		} while (!signal_pending(current) && (!id.data || i < count));
 	}
 
 	rtnl_lock();