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net: dsa: Fix legacy probing 

After commit 6d3c8c0dd8 ("net: dsa: Remove master_netdev and
use dst->cpu_dp->netdev") and a29342e739 ("net: dsa: Associate
slave network device with CPU port") we would be seeing NULL pointer
dereferences when accessing dst->cpu_dp->netdev too early. In the legacy
code, we actually know early in advance the master network device, so
pass it down to the relevant functions.

Fixes: 6d3c8c0dd8 ("net: dsa: Remove master_netdev and use dst->cpu_dp->netdev")
Fixes: a29342e739 ("net: dsa: Associate slave network device with CPU port")
Reported-by: Jason Cobham <jcobham@questertangent.com>
Tested-by: Jason Cobham <jcobham@questertangent.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2017-06-16 16:42:11 -07:00 committed by David S. Miller
parent d807ec656f
commit 06d4d450db
1 changed files with 8 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
net/dsa/legacy.c
View File

@ -95,18 +95,16 @@ static int dsa_cpu_dsa_setups(struct dsa_switch *ds, struct device *dev)
return 0;
}
static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
static int dsa_switch_setup_one(struct dsa_switch *ds, struct net_device *master,
struct device *parent)
{
const struct dsa_switch_ops *ops = ds->ops;
struct dsa_switch_tree *dst = ds->dst;
struct dsa_chip_data *cd = ds->cd;
bool valid_name_found = false;
struct net_device *master;
int index = ds->index;
int i, ret;
master = dst->cpu_dp->netdev;
/*
* Validate supplied switch configuration.
*/
@ -124,12 +122,12 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
return -EINVAL;
}
dst->cpu_dp = &ds->ports[i];
dst->cpu_dp->netdev = master;
ds->cpu_port_mask |= 1 << i;
} else if (!strcmp(name, "dsa")) {
ds->dsa_port_mask |= 1 << i;
} else {
ds->enabled_port_mask |= 1 << i;
ds->ports[i].cpu_dp = dst->cpu_dp;
}
valid_name_found = true;
}
@ -193,6 +191,7 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
*/
for (i = 0; i < ds->num_ports; i++) {
ds->ports[i].dn = cd->port_dn[i];
ds->ports[i].cpu_dp = dst->cpu_dp;
if (!(ds->enabled_port_mask & (1 << i)))
continue;
@ -217,11 +216,10 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
}
static struct dsa_switch *
dsa_switch_setup(struct dsa_switch_tree *dst, int index,
struct device *parent, struct device *host_dev)
dsa_switch_setup(struct dsa_switch_tree *dst, struct net_device *master,
int index, struct device *parent, struct device *host_dev)
{
struct dsa_chip_data *cd = dst->pd->chip + index;
struct net_device *master = dst->cpu_dp->netdev;
const struct dsa_switch_ops *ops;
struct dsa_switch *ds;
int ret;
@ -254,7 +252,7 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int index,
ds->ops = ops;
ds->priv = priv;
ret = dsa_switch_setup_one(ds, parent);
ret = dsa_switch_setup_one(ds, master, parent);
if (ret)
return ERR_PTR(ret);
@ -580,12 +578,11 @@ static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
unsigned configured = 0;
dst->pd = pd;
dst->cpu_dp->netdev = dev;
for (i = 0; i < pd->nr_chips; i++) {
struct dsa_switch *ds;
ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
ds = dsa_switch_setup(dst, dev, i, parent, pd->chip[i].host_dev);
if (IS_ERR(ds)) {
netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
i, PTR_ERR(ds));