net: Rework mdio-ofgpio driver to use of_mdio infrastructure

Changes to the fs_enet driver aa73832c5a80d6c52c69b18af858d88fa595dd3c
("net: Rework fs_enet driver to use of_mdio infrastructure")
cause kernel crashes when using the mdio-ofgpio driver.

This patch replicates similar changes made to the fs_enet mii-bitbang
drivers.  It has been tested on a custom mpc8280 based board using an
NFS mounted root.

Signed-off-by: Mark Ware <mware@elphinstone.net>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/mdio-gpio.c b/drivers/net/phy/mdio-gpio.c
index 33984b7..22cdd45 100644 (file)
--- a/drivers/net/phy/mdio-gpio.c
+++ b/drivers/net/phy/mdio-gpio.c
@@ -30,6 +30,7 @@
 
 #ifdef CONFIG_OF_GPIO
 #include <linux/of_gpio.h>
+#include <linux/of_mdio.h>
 #include <linux/of_platform.h>
 #endif
 
@@ -81,13 +82,12 @@ static struct mdiobb_ops mdio_gpio_ops = {
        .get_mdio_data = mdio_get,
 };
 
-static int __devinit mdio_gpio_bus_init(struct device *dev,
+static struct mii_bus * __devinit mdio_gpio_bus_init(struct device *dev,
                                        struct mdio_gpio_platform_data *pdata,
                                        int bus_id)
 {
        struct mii_bus *new_bus;
        struct mdio_gpio_info *bitbang;
-       int ret = -ENOMEM;
        int i;
 
        bitbang = kzalloc(sizeof(*bitbang), GFP_KERNEL);
@@ -104,8 +104,6 @@ static int __devinit mdio_gpio_bus_init(struct device *dev,
 
        new_bus->name = "GPIO Bitbanged MDIO",
 
-       ret = -ENODEV;
-
        new_bus->phy_mask = pdata->phy_mask;
        new_bus->irq = pdata->irqs;
        new_bus->parent = dev;
@@ -129,15 +127,8 @@ static int __devinit mdio_gpio_bus_init(struct device *dev,
 
        dev_set_drvdata(dev, new_bus);
 
-       ret = mdiobus_register(new_bus);
-       if (ret)
-               goto out_free_all;
-
-       return 0;
+       return new_bus;
 
-out_free_all:
-       dev_set_drvdata(dev, NULL);
-       gpio_free(bitbang->mdio);
 out_free_mdc:
        gpio_free(bitbang->mdc);
 out_free_bus:
@@ -145,30 +136,47 @@ out_free_bus:
 out_free_bitbang:
        kfree(bitbang);
 out:
-       return ret;
+       return NULL;
 }
 
-static void __devexit mdio_gpio_bus_destroy(struct device *dev)
+static void __devinit mdio_gpio_bus_deinit(struct device *dev)
 {
        struct mii_bus *bus = dev_get_drvdata(dev);
        struct mdio_gpio_info *bitbang = bus->priv;
 
-       mdiobus_unregister(bus);
-       free_mdio_bitbang(bus);
        dev_set_drvdata(dev, NULL);
-       gpio_free(bitbang->mdc);
        gpio_free(bitbang->mdio);
+       gpio_free(bitbang->mdc);
+       free_mdio_bitbang(bus);
        kfree(bitbang);
 }
 
+static void __devexit mdio_gpio_bus_destroy(struct device *dev)
+{
+       struct mii_bus *bus = dev_get_drvdata(dev);
+
+       mdiobus_unregister(bus);
+       mdio_gpio_bus_deinit(dev);
+}
+
 static int __devinit mdio_gpio_probe(struct platform_device *pdev)
 {
        struct mdio_gpio_platform_data *pdata = pdev->dev.platform_data;
+       struct mii_bus *new_bus;
+       int ret;
 
        if (!pdata)
                return -ENODEV;
 
-       return mdio_gpio_bus_init(&pdev->dev, pdata, pdev->id);
+       new_bus = mdio_gpio_bus_init(&pdev->dev, pdata, pdev->id);
+       if (!new_bus)
+               return -ENODEV;
+
+       ret = mdiobus_register(new_bus);
+       if (ret)
+               mdio_gpio_bus_deinit(&pdev->dev);
+
+       return ret;
 }
 
 static int __devexit mdio_gpio_remove(struct platform_device *pdev)
@@ -179,29 +187,12 @@ static int __devexit mdio_gpio_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_OF_GPIO
-static void __devinit add_phy(struct mdio_gpio_platform_data *pdata,
-                             struct device_node *np)
-{
-       const u32 *data;
-       int len, id, irq;
-
-       data = of_get_property(np, "reg", &len);
-       if (!data || len != 4)
-               return;
-
-       id = *data;
-       pdata->phy_mask &= ~(1 << id);
-
-       irq = of_irq_to_resource(np, 0, NULL);
-       if (irq)
-               pdata->irqs[id] = irq;
-}
 
 static int __devinit mdio_ofgpio_probe(struct of_device *ofdev,
                                         const struct of_device_id *match)
 {
-       struct device_node *np = NULL;
        struct mdio_gpio_platform_data *pdata;
+       struct mii_bus *new_bus;
        int ret;
 
        pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
@@ -215,14 +206,18 @@ static int __devinit mdio_ofgpio_probe(struct of_device *ofdev,
 
        ret = of_get_gpio(ofdev->node, 1);
        if (ret < 0)
-                goto out_free;
+               goto out_free;
        pdata->mdio = ret;
 
-       while ((np = of_get_next_child(ofdev->node, np)))
-               if (!strcmp(np->type, "ethernet-phy"))
-                       add_phy(pdata, np);
+       new_bus = mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc);
+       if (!new_bus)
+               return -ENODEV;
 
-       return mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc);
+       ret = of_mdiobus_register(new_bus, ofdev->node);
+       if (ret)
+               mdio_gpio_bus_deinit(&ofdev->dev);
+
+       return ret;
 
 out_free:
        kfree(pdata);