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>
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 9c208f0..a1d1f077 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -374,7 +374,7 @@
/* 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 @@
/* 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]);
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index b5a4d89..a47305c 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -222,10 +222,7 @@
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]);