cxgb4: avoid enabling napi twice to the same queue

[ 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>

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index 0d14761..090e006 100644 (file)
--- 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);