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    Subject[PATCH 5.10 082/158] net: dsa: microchip: ksz9477: fix fdb_dump last invalid entry
    Date
    From: Arun Ramadoss <arun.ramadoss@microchip.com>

    commit 36c0d935015766bf20d621c18313f17691bda5e3 upstream.

    In the ksz9477_fdb_dump function it reads the ALU control register and
    exit from the timeout loop if there is valid entry or search is
    complete. After exiting the loop, it reads the alu entry and report to
    the user space irrespective of entry is valid. It works till the valid
    entry. If the loop exited when search is complete, it reads the alu
    table. The table returns all ones and it is reported to user space. So
    bridge fdb show gives ff:ff:ff:ff:ff:ff as last entry for every port.
    To fix it, after exiting the loop the entry is reported only if it is
    valid one.

    Fixes: b987e98e50ab ("dsa: add DSA switch driver for Microchip KSZ9477")
    Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>
    Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
    Link: https://lore.kernel.org/r/20220816105516.18350-1-arun.ramadoss@microchip.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/net/dsa/microchip/ksz9477.c | 3 +++
    1 file changed, 3 insertions(+)

    --- a/drivers/net/dsa/microchip/ksz9477.c
    +++ b/drivers/net/dsa/microchip/ksz9477.c
    @@ -762,6 +762,9 @@ static int ksz9477_port_fdb_dump(struct
    goto exit;
    }

    + if (!(ksz_data & ALU_VALID))
    + continue;
    +
    /* read ALU table */
    ksz9477_read_table(dev, alu_table);


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