[PATCH net-next 1/7] net: dsa: get ports within parsing code

[Vivien Didelot]

There is no point into hiding the -EINVAL error code in ERR_PTR from a
dsa_get_ports function, simply get the "ports" node directly from within
the dsa_parse_ports_dn function.

This also has the effect to make the pdata and device tree handling code
symmetrical inside _dsa_register_switch.

At the same time, rename dsa_parse_ports_dn to dsa_parse_ports_of
because _of is a more common suffix for device tree parsing functions.

Signed-off-by: Vivien Didelot <vivien.dide...@savoirfairelinux.com>
---
 net/dsa/dsa2.c | 33 ++++++++++-----------------------
 1 file changed, 10 insertions(+), 23 deletions(-)

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index ec58654a71cd..26d2ff013eb1 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -589,11 +589,17 @@ static int dsa_dst_parse(struct dsa_switch_tree *dst)
        return 0;
 }
 
-static int dsa_parse_ports_dn(struct device_node *ports, struct dsa_switch *ds)
+static int dsa_parse_ports_of(struct device_node *dn, struct dsa_switch *ds)
 {
-       struct device_node *port;
-       int err;
+       struct device_node *ports, *port;
        u32 reg;
+       int err;
+
+       ports = of_get_child_by_name(dn, "ports");
+       if (!ports) {
+               dev_err(ds->dev, "no ports child node found\n");
+               return -EINVAL;
+       }
 
        for_each_available_child_of_node(ports, port) {
                err = of_property_read_u32(port, "reg", &reg);
@@ -664,26 +670,11 @@ static int dsa_parse_member(struct dsa_chip_data *pd, u32 
*tree, u32 *index)
        return 0;
 }
 
-static struct device_node *dsa_get_ports(struct dsa_switch *ds,
-                                        struct device_node *np)
-{
-       struct device_node *ports;
-
-       ports = of_get_child_by_name(np, "ports");
-       if (!ports) {
-               dev_err(ds->dev, "no ports child node found\n");
-               return ERR_PTR(-EINVAL);
-       }
-
-       return ports;
-}
-
 static int _dsa_register_switch(struct dsa_switch *ds)
 {
        struct dsa_chip_data *pdata = ds->dev->platform_data;
        struct device_node *np = ds->dev->of_node;
        struct dsa_switch_tree *dst;
-       struct device_node *ports;
        u32 tree, index;
        int i, err;
 
@@ -692,11 +683,7 @@ static int _dsa_register_switch(struct dsa_switch *ds)
                if (err)
                        return err;
 
-               ports = dsa_get_ports(ds, np);
-               if (IS_ERR(ports))
-                       return PTR_ERR(ports);
-
-               err = dsa_parse_ports_dn(ports, ds);
+               err = dsa_parse_ports_of(np, ds);
                if (err)
                        return err;
        } else {
-- 
2.14.3