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net: dsa: Introduce dsa_is_port_initialized

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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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4
net/dsa/dsa.c
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@ -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]);