netdev - [PATCH net-next v2 09/11] net: pcs: lynx: check that the fwnode is available prior to use

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Date: Wed, 07 Jun 2023 12:58:54 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Ioana Ciornei <ioana.ciornei@....com>,
	Jakub Kicinski <kuba@...nel.org>,
	Madalin Bucur <madalin.bucur@....com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>,
	Sean Anderson <sean.anderson@...o.com>
Subject: [PATCH net-next v2 09/11] net: pcs: lynx: check that the fwnode is
 available prior to use

Check that the fwnode is marked as available prior to trying to lookup
the PCS device, and return -ENODEV if unavailable. Document the return
codes from lynx_pcs_create_fwnode().

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/pcs/pcs-lynx.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/net/pcs/pcs-lynx.c b/drivers/net/pcs/pcs-lynx.c
index c2d01da40430..fca48ebf0b81 100644
--- a/drivers/net/pcs/pcs-lynx.c
+++ b/drivers/net/pcs/pcs-lynx.c
@@ -6,6 +6,7 @@
 #include <linux/mdio.h>
 #include <linux/phylink.h>
 #include <linux/pcs-lynx.h>
+#include <linux/property.h>
 
 #define SGMII_CLOCK_PERIOD_NS		8 /* PCS is clocked at 125 MHz */
 #define LINK_TIMER_VAL(ns)		((u32)((ns) / SGMII_CLOCK_PERIOD_NS))
@@ -346,11 +347,24 @@ struct phylink_pcs *lynx_pcs_create_mdiodev(struct mii_bus *bus, int addr)
 }
 EXPORT_SYMBOL(lynx_pcs_create_mdiodev);
 
+/*
+ * lynx_pcs_create_fwnode() creates a lynx PCS instance from the fwnode
+ * device indicated by node.
+ *
+ * Returns:
+ *  -ENODEV if the fwnode is marked unavailable
+ *  -EPROBE_DEFER if we fail to find the device
+ *  -ENOMEM if we fail to allocate memory
+ *  pointer to a phylink_pcs on success
+ */
 struct phylink_pcs *lynx_pcs_create_fwnode(struct fwnode_handle *node)
 {
 	struct mdio_device *mdio;
 	struct phylink_pcs *pcs;
 
+	if (!fwnode_device_is_available(node))
+		return ERR_PTR(-ENODEV);
+
 	mdio = fwnode_mdio_find_device(node);
 	if (!mdio)
 		return ERR_PTR(-EPROBE_DEFER);
-- 
2.30.2