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-rw-r--r--drivers/net/mdio.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/mdio.c b/drivers/net/mdio.c
index e85bf04cf813..f2d10abd0403 100644
--- a/drivers/net/mdio.c
+++ b/drivers/net/mdio.c
@@ -176,6 +176,9 @@ static u32 mdio45_get_an(const struct mdio_if_info *mdio, u16 addr)
* @npage_adv: Modes currently advertised on next pages
* @npage_lpa: Modes advertised by link partner on next pages
*
+ * The @ecmd parameter is expected to have been cleared before calling
+ * mdio45_ethtool_gset_npage().
+ *
* Since the CSRs for auto-negotiation using next pages are not fully
* standardised, this function does not attempt to decode them. The
* caller must pass them in.