netdev - [PATCH RFC v2 4/9] net: phy: clean up get_phy_c22

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Message-Id: <E1jdtNp-00083h-L4@rmk-PC.armlinux.org.uk>
Date:   Wed, 27 May 2020 11:34:01 +0100
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     Jeremy Linton <jeremy.linton@....com>,
        Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Subject: [PATCH RFC v2 4/9] net: phy: clean up get_phy_c22_id() invalid ID
 handling

Move the ID check from get_phy_device() into get_phy_c22_id(), which
simplifies get_phy_device(). The ID reading functions are now
responsible for indicating whether they found a PHY or not via their
return code - they must return -ENODEV when a PHY is not present.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/phy_device.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 53b914ee5031..424e608cec21 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -759,8 +759,10 @@ static int get_phy_c45_ids(struct mii_bus *bus, int addr,
  * @addr: PHY address on the MII bus
  * @phy_id: where to store the ID retrieved.
  *
- * Read the 802.3 clause 22 PHY ID from the PHY at @addr on the @bus.
- * Return the PHY ID read from the PHY in @phy_id on successful access.
+ * Read the 802.3 clause 22 PHY ID from the PHY at @addr on the @bus,
+ * placing it in @phy_id. Return zero on successful read and the ID is
+ * valid, %-EIO on bus access error, or %-ENODEV if no device responds
+ * or invalid ID.
  */
 static int get_phy_c22_id(struct mii_bus *bus, int addr, u32 *phy_id)
 {
@@ -782,6 +784,10 @@ static int get_phy_c22_id(struct mii_bus *bus, int addr, u32 *phy_id)
 
 	*phy_id |= phy_reg;
 
+	/* If the phy_id is mostly Fs, there is no device there */
+	if ((*phy_id & 0x1fffffff) == 0x1fffffff)
+		return -ENODEV;
+
 	return 0;
 }
 
@@ -812,10 +818,6 @@ struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
 	if (r)
 		return ERR_PTR(r);
 
-	/* If the phy_id is mostly Fs, there is no device there */
-	if ((phy_id & 0x1fffffff) == 0x1fffffff)
-		return ERR_PTR(-ENODEV);
-
 	return phy_device_create(bus, addr, phy_id, is_c45, &c45_ids);
 }
 EXPORT_SYMBOL(get_phy_device);
-- 
2.20.1