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-rw-r--r--include/linux/ethtool.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index ad22a68c2e5d..9de31274341d 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -798,8 +798,10 @@ bool ethtool_invalid_flags(struct net_device *dev, u32 data, u32 supported);
* attached to it. The implementation may update the indicator
* asynchronously or synchronously, but in either case it must return
* quickly. It is initially called with the argument %ETHTOOL_ID_ACTIVE,
- * and must either activate asynchronous updates or return -%EINVAL.
- * If it returns -%EINVAL then it will be called again at intervals with
+ * and must either activate asynchronous updates and return zero, return
+ * a negative error or return a positive frequency for synchronous
+ * indication (e.g. 1 for one on/off cycle per second). If it returns
+ * a frequency then it will be called again at intervals with the
* argument %ETHTOOL_ID_ON or %ETHTOOL_ID_OFF and should set the state of
* the indicator accordingly. Finally, it is called with the argument
* %ETHTOOL_ID_INACTIVE and must deactivate the indicator. Returns a