[PATCH net-next 5/7] net: dsa: get master device at port parsing time

[Vivien Didelot]

Fetching the master device can be done directly when a port is parsed
from device tree or pdata, instead of waiting until dsa_dst_parse.

Now that -EPROBE_DEFER is returned before we add the switch to the tree,
there is no need to check for this error after dsa_dst_parse.

Signed-off-by: Vivien Didelot <vivien.dide...@savoirfairelinux.com>
---
 net/dsa/dsa2.c | 44 ++++++++++++++++++--------------------------
 1 file changed, 18 insertions(+), 26 deletions(-)

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 5b9dea81d617..be43e06caf7e 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -470,27 +470,9 @@ static int dsa_cpu_parse(struct dsa_port *port, u32 index,
 {
        const struct dsa_device_ops *tag_ops;
        enum dsa_tag_protocol tag_protocol;
-       struct net_device *ethernet_dev;
-       struct device_node *ethernet;
 
-       if (port->dn) {
-               ethernet = of_parse_phandle(port->dn, "ethernet", 0);
-               if (!ethernet)
-                       return -EINVAL;
-               ethernet_dev = of_find_net_device_by_node(ethernet);
-               if (!ethernet_dev)
-                       return -EPROBE_DEFER;
-       } else {
-               ethernet_dev = dsa_dev_to_net_device(ds->cd->netdev[index]);
-               if (!ethernet_dev)
-                       return -EPROBE_DEFER;
-               dev_put(ethernet_dev);
-       }
-
-       if (!dst->cpu_dp) {
+       if (!dst->cpu_dp)
                dst->cpu_dp = port;
-               dst->cpu_dp->master = ethernet_dev;
-       }
 
        tag_protocol = ds->ops->get_tag_protocol(ds);
        tag_ops = dsa_resolve_tag_protocol(tag_protocol);
@@ -584,7 +566,14 @@ static int dsa_port_parse_of(struct dsa_port *dp, struct 
device_node *dn)
        struct device_node *link = of_parse_phandle(dn, "link", 0);
 
        if (ethernet) {
+               struct net_device *master;
+
+               master = of_find_net_device_by_node(ethernet);
+               if (!master)
+                       return -EPROBE_DEFER;
+
                dp->type = DSA_PORT_TYPE_CPU;
+               dp->master = master;
        } else if (link) {
                dp->type = DSA_PORT_TYPE_DSA;
        } else {
@@ -631,7 +620,16 @@ static int dsa_port_parse(struct dsa_port *dp, const char 
*name,
                          struct device *dev)
 {
        if (!strcmp(name, "cpu")) {
+               struct net_device *master;
+
+               master = dsa_dev_to_net_device(dev);
+               if (!master)
+                       return -EPROBE_DEFER;
+
+               dev_put(master);
+
                dp->type = DSA_PORT_TYPE_CPU;
+               dp->master = master;
        } else if (!strcmp(name, "dsa")) {
                dp->type = DSA_PORT_TYPE_DSA;
        } else {
@@ -773,14 +771,8 @@ static int _dsa_register_switch(struct dsa_switch *ds)
        }
 
        err = dsa_dst_parse(dst);
-       if (err) {
-               if (err == -EPROBE_DEFER) {
-                       dsa_dst_del_ds(dst, ds, ds->index);
-                       return err;
-               }
-
+       if (err)
                goto out_del_dst;
-       }
 
        err = dsa_dst_apply(dst);
        if (err) {
-- 
2.14.3