[PATCH net-next 1/3] net: phylink: provide phylink_mac_implements_lpi()

["Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>]

Provide a helper to determine whether the MAC operations structure
implements the LPI operations, which will be used by both phylink and
DSA.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/phy/phylink.c |  3 +--
 include/linux/phylink.h   | 12 ++++++++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 214b62fba991..6fbb5fd5b400 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -1957,8 +1957,7 @@ struct phylink *phylink_create(struct phylink_config *config,
 		return ERR_PTR(-EINVAL);
 	}
 
-	pl->mac_supports_eee_ops = mac_ops->mac_disable_tx_lpi &&
-				   mac_ops->mac_enable_tx_lpi;
+	pl->mac_supports_eee_ops = phylink_mac_implements_lpi(mac_ops);
 	pl->mac_supports_eee = pl->mac_supports_eee_ops &&
 			       pl->config->lpi_capabilities &&
 			       !phy_interface_empty(pl->config->lpi_interfaces);
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index 898b00451bbf..0de78673172d 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -737,6 +737,18 @@ static inline int phylink_get_link_timer_ns(phy_interface_t interface)
 	}
 }
 
+/**
+ * phylink_mac_implements_lpi() - determine if MAC implements LPI ops
+ * @ops: phylink_mac_ops structure
+ *
+ * Returns true if the phylink MAC operations structure indicates that the
+ * LPI operations have been implemented, false otherwise.
+ */
+static inline bool phylink_mac_implements_lpi(const struct phylink_mac_ops *ops)
+{
+	return ops && ops->mac_disable_tx_lpi && ops->mac_enable_tx_lpi;
+}
+
 void phylink_mii_c22_pcs_decode_state(struct phylink_link_state *state,
 				      unsigned int neg_mode, u16 bmsr, u16 lpa);
 void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs,
-- 
2.30.2