linux-kernel - [PATCH net-next 07/11] net: dsa: add find port by node helper

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Date:   Mon,  6 Nov 2017 16:11:49 -0500
From:   Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Subject: [PATCH net-next 07/11] net: dsa: add find port by node helper

Instead of having two dsa_ds_find_port_dn (which returns a bool) and
dsa_dst_find_port_dn (which returns a switch) functions, provide a more
explicit dsa_tree_find_port_by_node function which returns a matching
port.

Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
---
 net/dsa/dsa2.c | 37 +++++++++++++++++--------------------
 1 file changed, 17 insertions(+), 20 deletions(-)

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 676c0bc943dd..0f6f8c1701f9 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -117,30 +117,24 @@ static bool dsa_port_is_user(struct dsa_port *dp)
 	return dp->type == DSA_PORT_TYPE_USER;
 }
 
-static bool dsa_ds_find_port_dn(struct dsa_switch *ds,
-				struct device_node *port)
-{
-	u32 index;
-
-	for (index = 0; index < ds->num_ports; index++)
-		if (ds->ports[index].dn == port)
-			return true;
-	return false;
-}
-
-static struct dsa_switch *dsa_dst_find_port_dn(struct dsa_switch_tree *dst,
-					       struct device_node *port)
+static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst,
+						   struct device_node *dn)
 {
 	struct dsa_switch *ds;
-	u32 index;
+	struct dsa_port *dp;
+	int device, port;
 
-	for (index = 0; index < DSA_MAX_SWITCHES; index++) {
-		ds = dst->ds[index];
+	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
+		ds = dst->ds[device];
 		if (!ds)
 			continue;
 
-		if (dsa_ds_find_port_dn(ds, port))
-			return ds;
+		for (port = 0; port < ds->num_ports; port++) {
+			dp = &ds->ports[port];
+
+			if (dp->dn == dn)
+				return dp;
+		}
 	}
 
 	return NULL;
@@ -154,18 +148,21 @@ static int dsa_port_complete(struct dsa_switch_tree *dst,
 	struct device_node *link;
 	int index;
 	struct dsa_switch *dst_ds;
+	struct dsa_port *link_dp;
 
 	for (index = 0;; index++) {
 		link = of_parse_phandle(port->dn, "link", index);
 		if (!link)
 			break;
 
-		dst_ds = dsa_dst_find_port_dn(dst, link);
+		link_dp = dsa_tree_find_port_by_node(dst, link);
 		of_node_put(link);
 
-		if (!dst_ds)
+		if (!link_dp)
 			return 1;
 
+		dst_ds = link_dp->ds;
+
 		src_ds->rtable[dst_ds->index] = src_port;
 	}
 
-- 
2.14.3