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The platform data nr_chips is used when validating a received packet, to ensure it comes from a know switch chip. The number of possible switches is limited to DSA_MAX_SWITCHES, so use this as the first validation step. The new binding allows holes in the dst->ds[] array, so also ensure ensure there is a valid dsa_switch for this packet. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: David S. Miller <davem@davemloft.net>