netdev - [PATCH v2 net-next] net: phy: improve genphy_c45_read

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Date:   Tue, 5 Feb 2019 20:41:37 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>,
        Russell King <linux@...linux.org.uk>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH v2 net-next] net: phy: improve genphy_c45_read_link

Let's make genphy_c45_read_link behave the same as genphy_update_link
and set phydev->link in the function directly. This allows to simplify
the callers. In addition don't check further devices once we detect
that at least one device reports link as down.

v2:
- remove an unused variable

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/phy/marvell10g.c |  2 --
 drivers/net/phy/phy-c45.c    | 15 ++++++---------
 2 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 38cfc923a..be2cfdfd8 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -475,8 +475,6 @@ static int mv3310_read_status(struct phy_device *phydev)
 	if (val < 0)
 		return val;
 
-	phydev->link = val > 0 ? 1 : 0;
-
 	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
 	if (val < 0)
 		return val;
diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index 03af927fa..b874c4858 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -134,7 +134,7 @@ EXPORT_SYMBOL_GPL(genphy_c45_aneg_done);
  * @mmd_mask: MMDs to read status from
  *
  * Read the link status from the specified MMDs, and if they all indicate
- * that the link is up, return positive.  If an error is encountered,
+ * that the link is up, set phydev->link to 1.  If an error is encountered,
  * a negative errno will be returned, otherwise zero.
  */
 int genphy_c45_read_link(struct phy_device *phydev, u32 mmd_mask)
@@ -142,7 +142,7 @@ int genphy_c45_read_link(struct phy_device *phydev, u32 mmd_mask)
 	int val, devad;
 	bool link = true;
 
-	while (mmd_mask) {
+	while (mmd_mask && link) {
 		devad = __ffs(mmd_mask);
 		mmd_mask &= ~BIT(devad);
 
@@ -158,7 +158,9 @@ int genphy_c45_read_link(struct phy_device *phydev, u32 mmd_mask)
 			link = false;
 	}
 
-	return link;
+	phydev->link = link;
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(genphy_c45_read_link);
 
@@ -278,7 +280,6 @@ EXPORT_SYMBOL_GPL(gen10g_config_aneg);
 int gen10g_read_status(struct phy_device *phydev)
 {
 	u32 mmd_mask = phydev->c45_ids.devices_in_package;
-	int ret;
 
 	/* For now just lie and say it's 10G all the time */
 	phydev->speed = SPEED_10000;
@@ -287,11 +288,7 @@ int gen10g_read_status(struct phy_device *phydev)
 	/* Avoid reading the vendor MMDs */
 	mmd_mask &= ~(BIT(MDIO_MMD_VEND1) | BIT(MDIO_MMD_VEND2));
 
-	ret = genphy_c45_read_link(phydev, mmd_mask);
-
-	phydev->link = ret > 0 ? 1 : 0;
-
-	return 0;
+	return genphy_c45_read_link(phydev, mmd_mask);
 }
 EXPORT_SYMBOL_GPL(gen10g_read_status);
 
-- 
2.20.1