vlan: Propagate physical MTU changes

When the physical MTU changes we want to ensure that all existing
VLAN device MTUs do not exceed the new underlying MTU.  This patch
adds that propagation.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 file changed