Skip to contentSkip to conversation

arc_emac: fix probe error path

PATCH Applied Heiko Stübner 2 participants 4 messages Apr 25, 2014 – Apr 27, 2014

Subsystems (3)
Networking Network drivers Device tree bindings
lore
Share & tools
lore

Heiko Stübner

author
#0 lore raw

PATCH v2 1/2 arc_emac: fix probe error path

The probe function at the moment only frees the netdev but does not disconnect the phy or removes the mdio bus it registered.

Signed-off-by Heiko Stuebner <[email protected]>

---
changes since v1:
- fix duplicate netif_api_del found by Max Schwarz

 drivers/net/ethernet/arc/emac_main.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)
drivers/net/ethernet/arc/emac_main.c +14 -9
index 9f45782..9747dda 100644
@@ -683,7 +683,7 @@ static int arc_emac_probe(struct platform_device *pdev)
 	priv->regs = devm_ioremap_resource(&pdev->dev, &res_regs);
 	if (IS_ERR(priv->regs)) {
 		err = PTR_ERR(priv->regs);
-		goto out;
+		goto out_netdev;
 	}
 	dev_dbg(&pdev->dev, "Registers base address is 0x%p\n", priv->regs);
 

@@ -693,7 +693,7 @@ static int arc_emac_probe(struct platform_device *pdev)
 	if (!(id == 0x0005fd02 || id == 0x0007fd02)) {
 		dev_err(&pdev->dev, "ARC EMAC not detected, id=0x%x\n", id);
 		err = -ENODEV;
-		goto out;
+		goto out_netdev;
 	}
 	dev_info(&pdev->dev, "ARC EMAC detected with id: 0x%x\n", id);
 

@@ -708,7 +708,7 @@ static int arc_emac_probe(struct platform_device *pdev)
 			       ndev->name, ndev);
 	if (err) {
 		dev_err(&pdev->dev, "could not allocate IRQ\n");
-		goto out;
+		goto out_netdev;
 	}
 
 	/* Get MAC address from device tree */

@@ -729,7 +729,7 @@ static int arc_emac_probe(struct platform_device *pdev)
 	if (!priv->rxbd) {
 		dev_err(&pdev->dev, "failed to allocate data buffers\n");
 		err = -ENOMEM;
-		goto out;
+		goto out_netdev;
 	}
 
 	priv->txbd = priv->rxbd + RX_BD_NUM;

@@ -741,7 +741,7 @@ static int arc_emac_probe(struct platform_device *pdev)
 	err = arc_mdio_probe(pdev, priv);
 	if (err) {
 		dev_err(&pdev->dev, "failed to probe MII bus\n");
-		goto out;
+		goto out_netdev;
 	}
 
 	priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0,

@@ -749,7 +749,7 @@ static int arc_emac_probe(struct platform_device *pdev)
 	if (!priv->phy_dev) {
 		dev_err(&pdev->dev, "of_phy_connect() failed\n");
 		err = -ENODEV;
-		goto out;
+		goto out_mdio;
 	}
 
 	dev_info(&pdev->dev, "connected to %s phy with id 0x%x\n",

@@ -759,14 +759,19 @@ static int arc_emac_probe(struct platform_device *pdev)
 
 	err = register_netdev(ndev);
 	if (err) {
-		netif_napi_del(&priv->napi);
 		dev_err(&pdev->dev, "failed to register network device\n");
-		goto out;
+		goto out_netif_api;
 	}
 
 	return 0;
 
-out:
+out_netif_api:
+	netif_napi_del(&priv->napi);
+	phy_disconnect(priv->phy_dev);
+	priv->phy_dev = NULL;
+out_mdio:
+	arc_mdio_remove(priv);
+out_netdev:
 	free_netdev(ndev);
 	return err;
 }
Signature · 1 line
1.9.0
author
#1 lore raw

PATCH v2 2/2 arc_emac: add clock handling

This adds ability for the arc_emac to really handle its supplying clock. To get the needed clock-frequency either a real clock or the previous clock-frequency property must be provided.

Signed-off-by Heiko Stuebner <[email protected]>
Tested-by Max Schwarz <[email protected]>

---
changes since v1:
- fix wrong clk error check found by Max Schwarz

 Documentation/devicetree/bindings/net/arc_emac.txt | 12 +++++-
 drivers/net/ethernet/arc/emac.h                    |  2 +
 drivers/net/ethernet/arc/emac_main.c               | 46 ++++++++++++++++------
 3 files changed, 47 insertions(+), 13 deletions(-)
Documentation/devicetree/bindings/net/arc_emac.txt +10 -2
index 7fbb027..a1d71eb 100644
@@ -4,11 +4,15 @@ Required properties:
 - compatible: Should be "snps,arc-emac"
 - reg: Address and length of the register set for the device
 - interrupts: Should contain the EMAC interrupts
-- clock-frequency: CPU frequency. It is needed to calculate and set polling
-period of EMAC.
 - max-speed: see ethernet.txt file in the same directory.
 - phy: see ethernet.txt file in the same directory.
 
+Clock handling:
+The clock frequency is needed to calculate and set polling period of EMAC.
+It must be provided by one of:
+- clock-frequency: CPU frequency.
+- clocks: reference to the clock supplying the EMAC.
+
 Child nodes of the driver are the individual PHY devices connected to the
 MDIO bus. They must have a "reg" property given the PHY address on the MDIO bus.
 

@@ -19,7 +23,11 @@ Examples:
 		reg = <0xc0fc2000 0x3c>;
 		interrupts = <6>;
 		mac-address = [ 00 11 22 33 44 55 ];
+
 		clock-frequency = <80000000>;
+		/* or */
+		clocks = <&emac_clock>;
+
 		max-speed = <100>;
 		phy = <&phy0>;
drivers/net/ethernet/arc/emac.h +2 -0
index 928fac6..53f85bf 100644
@@ -11,6 +11,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/netdevice.h>
 #include <linux/phy.h>
+#include <linux/clk.h>
 
 /* STATUS and ENABLE Register bit masks */
 #define TXINT_MASK	(1<<0)	/* Transmit interrupt */

@@ -131,6 +132,7 @@ struct arc_emac_priv {
 	struct mii_bus *bus;
 
 	void __iomem *regs;
+	struct clk *clk;
 
 	struct napi_struct napi;
 	struct net_device_stats stats;
drivers/net/ethernet/arc/emac_main.c +35 -11

94 lines not on this page · raw message

Signature · 1 line
1.9.0