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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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5
include/net/dsa.h
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@@ -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;