[PATCH RFC v2 01/32] net: dsa: Move platform data allocation for OF

[Andrew Lunn]

From: Florian Fainelli <f.faine...@gmail.com>

Do not have dsa_of_probe() allocate and assign struct dsa_platform_data,
but instead do this outside of this function such that we can control
exactly the storage of that data structure.

This is a preliminary change to allow multiple callers of dsa_of_probe()
not to clobber an existing dsa_platform_data and later, control where
this data structure is coming from.

Signed-off-by: Florian Fainelli <f.faine...@gmail.com>
---
 net/dsa/dsa.c | 48 +++++++++++++++++++-----------------------------
 1 file changed, 19 insertions(+), 29 deletions(-)

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index fa4daba8db55..be68c00b8cfd 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -651,13 +651,12 @@ static void dsa_of_free_platform_data(struct 
dsa_platform_data *pd)
        kfree(pd->chip);
 }
 
-static int dsa_of_probe(struct device *dev)
+static int dsa_of_probe(struct device *dev, struct dsa_platform_data *pd)
 {
        struct device_node *np = dev->of_node;
        struct device_node *child, *mdio, *ethernet, *port;
        struct mii_bus *mdio_bus, *mdio_bus_switch;
        struct net_device *ethernet_dev;
-       struct dsa_platform_data *pd;
        struct dsa_chip_data *cd;
        const char *port_name;
        int chip_index, port_index;
@@ -666,7 +665,7 @@ static int dsa_of_probe(struct device *dev)
        enum of_gpio_flags of_flags;
        unsigned long flags;
        u32 eeprom_len;
-       int ret;
+       int ret = 0;
 
        mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
        if (!mdio)
@@ -688,13 +687,6 @@ static int dsa_of_probe(struct device *dev)
                goto out_put_mdio;
        }
 
-       pd = kzalloc(sizeof(*pd), GFP_KERNEL);
-       if (!pd) {
-               ret = -ENOMEM;
-               goto out_put_ethernet;
-       }
-
-       dev->platform_data = pd;
        pd->of_netdev = ethernet_dev;
        pd->nr_chips = of_get_available_child_count(np);
        if (pd->nr_chips > DSA_MAX_SWITCHES)
@@ -702,10 +694,8 @@ static int dsa_of_probe(struct device *dev)
 
        pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
                           GFP_KERNEL);
-       if (!pd->chip) {
-               ret = -ENOMEM;
-               goto out_free;
-       }
+       if (!pd->chip)
+               goto out_put_mdio;
 
        chip_index = -1;
        for_each_available_child_of_node(np, child) {
@@ -795,34 +785,29 @@ static int dsa_of_probe(struct device *dev)
 
 out_free_chip:
        dsa_of_free_platform_data(pd);
-out_free:
-       kfree(pd);
-       dev->platform_data = NULL;
-out_put_ethernet:
-       put_device(&ethernet_dev->dev);
+
 out_put_mdio:
        put_device(&mdio_bus->dev);
        return ret;
 }
 
-static void dsa_of_remove(struct device *dev)
+static void dsa_of_remove(struct device *dev, struct dsa_platform_data *pd)
 {
-       struct dsa_platform_data *pd = dev->platform_data;
-
        if (!dev->of_node)
                return;
 
        dsa_of_free_platform_data(pd);
        put_device(&pd->of_netdev->dev);
-       kfree(pd);
 }
 #else
-static inline int dsa_of_probe(struct device *dev)
+static inline int dsa_of_probe(struct device *dev,
+                              struct dsa_platform_data *pd)
 {
        return 0;
 }
 
-static inline void dsa_of_remove(struct device *dev)
+static inline void dsa_of_remove(struct device *dev,
+                                struct dsa_platform_data *pd)
 {
 }
 #endif
@@ -881,11 +866,15 @@ static int dsa_probe(struct platform_device *pdev)
                       dsa_driver_version);
 
        if (pdev->dev.of_node) {
-               ret = dsa_of_probe(&pdev->dev);
+               pd = devm_kzalloc(&pdev->dev, sizeof(*pd), GFP_KERNEL);
+               if (!pd)
+                       return -ENOMEM;
+
+               ret = dsa_of_probe(&pdev->dev, pd);
                if (ret)
                        return ret;
 
-               pd = pdev->dev.platform_data;
+               pdev->dev.platform_data = pd;
        }
 
        if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
@@ -926,7 +915,7 @@ static int dsa_probe(struct platform_device *pdev)
        return 0;
 
 out:
-       dsa_of_remove(&pdev->dev);
+       dsa_of_remove(&pdev->dev, pd);
 
        return ret;
 }
@@ -948,9 +937,10 @@ static void dsa_remove_dst(struct dsa_switch_tree *dst)
 static int dsa_remove(struct platform_device *pdev)
 {
        struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
+       struct dsa_platform_data *pd = pdev->dev.platform_data;
 
        dsa_remove_dst(dst);
-       dsa_of_remove(&pdev->dev);
+       dsa_of_remove(&pdev->dev, pd);
 
        return 0;
 }
-- 
2.7.0