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[ Upstream commit6344dbde6a] When asking the ARL to read a MAC address, we will get a number of bins returned in a single read. Out of those bins, there can essentially be 3 states: - all bins are full, we have no space left, and we can either replace an existing address or return that full condition - the MAC address was found, then we need to return its bin index and modify that one, and only that one - the MAC address was not found and we have a least one bin free, we use that bin index location then The code would unfortunately fail on all counts. Fixes:1da6df85c6("net: dsa: b53: Implement ARL add/del/dump operations") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>