ionic: add queue lock around open and stop

Add the queue configuration lock to ionic_open() and
ionic_stop() so that they don't collide with other in parallel
queue configuration actions such as MTU changes as can be
demonstrated with a tight loop of ifup/change-mtu/ifdown.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index d69c80c..1d31b93 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -2233,9 +2233,11 @@ static int ionic_open(struct net_device *netdev)
        if (test_and_clear_bit(IONIC_LIF_F_BROKEN, lif->state))
                netdev_info(netdev, "clearing broken state\n");
 
+       mutex_lock(&lif->queue_lock);
+
        err = ionic_txrx_alloc(lif);
        if (err)
-               return err;
+               goto err_unlock;
 
        err = ionic_txrx_init(lif);
        if (err)
@@ -2256,12 +2258,15 @@ static int ionic_open(struct net_device *netdev)
                        goto err_txrx_deinit;
        }
 
+       mutex_unlock(&lif->queue_lock);
        return 0;
 
 err_txrx_deinit:
        ionic_txrx_deinit(lif);
 err_txrx_free:
        ionic_txrx_free(lif);
+err_unlock:
+       mutex_unlock(&lif->queue_lock);
        return err;
 }
 
@@ -2281,9 +2286,11 @@ static int ionic_stop(struct net_device *netdev)
        if (test_bit(IONIC_LIF_F_FW_RESET, lif->state))
                return 0;
 
+       mutex_lock(&lif->queue_lock);
        ionic_stop_queues(lif);
        ionic_txrx_deinit(lif);
        ionic_txrx_free(lif);
+       mutex_unlock(&lif->queue_lock);
 
        return 0;
 }