From d87d6f44d7c1254fd9560a5191659cb00882db56 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Tue, 24 Feb 2015 13:15:32 -0800 Subject: [PATCH] net: dsa: Ensure that port array elements are initialized before being used A network device notifier 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 Signed-off-by: David S. Miller --- net/dsa/dsa.c | 10 +++------- net/dsa/dsa_priv.h | 5 ++--- net/dsa/slave.c | 15 ++++++++------- 3 files changed, 13 insertions(+), 17 deletions(-) diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c index 2173402..fc18131 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 dc9756d..7eb1a6a 100644 --- a/net/dsa/dsa_priv.h +++ b/net/dsa/dsa_priv.h @@ -53,9 +53,8 @@ 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); diff --git a/net/dsa/slave.c b/net/dsa/slave.c index f23deadf..5be4c92 100644 --- a/net/dsa/slave.c +++ b/net/dsa/slave.c @@ -605,9 +605,8 @@ 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; @@ -617,7 +616,7 @@ 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; @@ -667,19 +666,21 @@ 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; } -- 2.7.4