netdev - [PATCH net-next 15/16] net: dsa: allocate ports on touch

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Message-Id: <20191020031941.3805884-16-vivien.didelot@gmail.com>
Date:   Sat, 19 Oct 2019 23:19:40 -0400
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     linux-kernel@...r.kernel.org,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org
Subject: [PATCH net-next 15/16] net: dsa: allocate ports on touch

Allocate the struct dsa_port the first time it is accessed with
dsa_port_touch, and remove the static dsa_port array from the
dsa_switch structure.

Signed-off-by: Vivien Didelot <vivien.didelot@...il.com>
---
 include/net/dsa.h |  2 --
 net/dsa/dsa2.c    | 16 ++++++++++++++--
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 020f5db8666b..d28ac54cb8c4 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -277,9 +277,7 @@ struct dsa_switch {
 	 */
 	bool			vlan_filtering;
 
-	/* Dynamically allocated ports, keep last */
 	size_t num_ports;
-	struct dsa_port ports[];
 };
 
 static inline struct dsa_port *dsa_to_port(struct dsa_switch *ds, int p)
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 772deacc33d3..7669a6278c40 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -596,7 +596,13 @@ static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index)
 	struct dsa_switch_tree *dst = ds->dst;
 	struct dsa_port *dp;
 
-	dp = &ds->ports[index];
+	list_for_each_entry(dp, &dst->ports, list)
+		if (dp->ds == ds && dp->index == index)
+			return dp;
+
+	dp = kzalloc(sizeof(*dp), GFP_KERNEL);
+	if (!dp)
+		return NULL;
 
 	dp->ds = ds;
 	dp->index = index;
@@ -865,7 +871,7 @@ struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
 {
 	struct dsa_switch *ds;
 
-	ds = devm_kzalloc(dev, struct_size(ds, ports, n), GFP_KERNEL);
+	ds = devm_kzalloc(dev, sizeof(*ds), GFP_KERNEL);
 	if (!ds)
 		return NULL;
 
@@ -893,6 +899,12 @@ static void dsa_switch_remove(struct dsa_switch *ds)
 {
 	struct dsa_switch_tree *dst = ds->dst;
 	unsigned int index = ds->index;
+	struct dsa_port *dp, *next;
+
+	list_for_each_entry_safe(dp, next, &dst->ports, list) {
+		list_del(&dp->list);
+		kfree(dp);
+	}
 
 	dsa_tree_remove_switch(dst, index);
 }
-- 
2.23.0