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    Subject[PATCH 4.4 03/90] cxgb4: avoid enabling napi twice to the same queue
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Ganesh Goudar <ganeshgr@chelsio.com>


    [ Upstream commit e7519f9926f1d0d11c776eb0475eb098c7760f68 ]

    Take uld mutex to avoid race between cxgb_up() and
    cxgb4_register_uld() to enable napi for the same uld
    queue.

    Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
    +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
    @@ -2714,10 +2714,14 @@ static int cxgb_up(struct adapter *adap)
    if (err)
    goto irq_err;
    }
    +
    + mutex_lock(&uld_mutex);
    enable_rx(adap);
    t4_sge_start(adap);
    t4_intr_enable(adap);
    adap->flags |= FULL_INIT_DONE;
    + mutex_unlock(&uld_mutex);
    +
    notify_ulds(adap, CXGB4_STATE_UP);
    #if IS_ENABLED(CONFIG_IPV6)
    update_clip(adap);

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