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net: dsa: Introduce dsa_is_port_initialized 

To avoid race conditions when using the ds->ports[] array,
we need to check if the accessed port has been initialized.
Introduce and use helper function dsa_is_port_initialized
for that purpose and use it where needed.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Guenter Roeck 2015-02-24 23:02:02 -08:00 committed by David S. Miller
parent bb66be1c54
commit d79d210736
3 changed files with 8 additions and 6 deletions
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5
include/net/dsa.h
View File

@ -165,6 +165,11 @@ static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
return !!(ds->index == ds->dst->cpu_switch && p == ds->dst->cpu_port);
}
static inline bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
{
return ds->phys_port_mask & (1 << p) && ds->ports[p];
}
static inline u8 dsa_upstream_port(struct dsa_switch *ds)
{
struct dsa_switch_tree *dst = ds->dst;

4
net/dsa/dsa.c
View File

@ -374,7 +374,7 @@ static int dsa_switch_suspend(struct dsa_switch *ds)
/* Suspend slave network devices */
for (i = 0; i < DSA_MAX_PORTS; i++) {
if (!(ds->phys_port_mask & (1 << i)))
if (!dsa_is_port_initialized(ds, i))
continue;
ret = dsa_slave_suspend(ds->ports[i]);
@ -400,7 +400,7 @@ static int dsa_switch_resume(struct dsa_switch *ds)
/* Resume slave network devices */
for (i = 0; i < DSA_MAX_PORTS; i++) {
if (!(ds->phys_port_mask & (1 << i)))
if (!dsa_is_port_initialized(ds, i))
continue;
ret = dsa_slave_resume(ds->ports[i]);

5
net/dsa/slave.c
View File

@ -222,10 +222,7 @@ static u32 dsa_slave_br_port_mask(struct dsa_switch *ds,
u32 mask = 0;
for (port = 0; port < DSA_MAX_PORTS; port++) {
if (!((1 << port) & ds->phys_port_mask))
continue;
if (!ds->ports[port])
if (!dsa_is_port_initialized(ds, port))
continue;
p = netdev_priv(ds->ports[port]);