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Message-Id: <1424709226-3586-1-git-send-email-linux@roeck-us.net>
Date: Mon, 23 Feb 2015 08:33:46 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>
Subject: [RFT PATCH] net: dsa: Ensure that port array elements are initialized before being used
dsa_slave_netdevice_event can be called for one or more of the created
slave devices before all slave devices have been registered. This can
result in a mismatch between ds->phys_port_mask and the registered devices
by the time the call is made, and it can result in a slave device being
added to a bridge before its entry in ds->ports[] has been initialized.
Rework the initialization code to initialize entries in ds->ports[] in
dsa_slave_create. With this change, dsa_slave_create no longer needs
to return slave_dev but can return an error code instead.
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
Applies on top of Florian's patches integrating dsa with SWITCHDEV (v3).
net/dsa/dsa.c | 10 +++-------
net/dsa/dsa_priv.h | 5 ++---
net/dsa/slave.c | 17 ++++++++++-------
3 files changed, 15 insertions(+), 17 deletions(-)
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 293e0c3..9c208f0 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -314,19 +314,15 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int index,
* Create network devices for physical switch ports.
*/
for (i = 0; i < DSA_MAX_PORTS; i++) {
- struct net_device *slave_dev;
-
if (!(ds->phys_port_mask & (1 << i)))
continue;
- slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
- if (slave_dev == NULL) {
+ ret = dsa_slave_create(ds, parent, i, pd->port_names[i]);
+ if (ret < 0) {
netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s)\n",
index, i, pd->port_names[i]);
- continue;
+ ret = 0;
}
-
- ds->ports[i] = slave_dev;
}
#ifdef CONFIG_NET_DSA_HWMON
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index b8d7231..d5f1f9b 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -55,9 +55,8 @@ extern char dsa_driver_version[];
/* slave.c */
extern const struct dsa_device_ops notag_netdev_ops;
void dsa_slave_mii_bus_init(struct dsa_switch *ds);
-struct net_device *dsa_slave_create(struct dsa_switch *ds,
- struct device *parent,
- int port, char *name);
+int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
+ int port, char *name);
int dsa_slave_suspend(struct net_device *slave_dev);
int dsa_slave_resume(struct net_device *slave_dev);
int dsa_slave_netdevice_event(struct notifier_block *unused,
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 7ab19f2..ca8f45f 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -224,6 +224,8 @@ static u32 dsa_slave_br_port_mask(struct dsa_switch *ds,
for (port = 0; port < DSA_MAX_PORTS; port++) {
if (!((1 << port) & ds->phys_port_mask))
continue;
+ if (!ds->ports[port])
+ continue;
p = netdev_priv(ds->ports[port]);
@@ -709,9 +711,8 @@ int dsa_slave_resume(struct net_device *slave_dev)
return 0;
}
-struct net_device *
-dsa_slave_create(struct dsa_switch *ds, struct device *parent,
- int port, char *name)
+int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
+ int port, char *name)
{
struct net_device *master = ds->dst->master_netdev;
struct net_device *slave_dev;
@@ -721,7 +722,7 @@ dsa_slave_create(struct dsa_switch *ds, struct device *parent,
slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
NET_NAME_UNKNOWN, ether_setup);
if (slave_dev == NULL)
- return slave_dev;
+ return -ENOMEM;
slave_dev->features = master->vlan_features;
slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
@@ -771,21 +772,23 @@ dsa_slave_create(struct dsa_switch *ds, struct device *parent,
ret = dsa_slave_phy_setup(p, slave_dev);
if (ret) {
free_netdev(slave_dev);
- return NULL;
+ return ret;
}
+ ds->ports[port] = slave_dev;
ret = register_netdev(slave_dev);
if (ret) {
netdev_err(master, "error %d registering interface %s\n",
ret, slave_dev->name);
phy_disconnect(p->phy);
+ ds->ports[port] = NULL;
free_netdev(slave_dev);
- return NULL;
+ return ret;
}
netif_carrier_off(slave_dev);
- return slave_dev;
+ return 0;
}
static bool dsa_slave_dev_check(struct net_device *dev)
--
2.1.0
--
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