hinic: fix rewaking txq after netif_tx_disable

When calling hinic_close in hinic_set_channels, all queues are
stopped after netif_tx_disable, but some queue may be rewaken in
free_tx_poll by mistake while drv is handling tx irq. If one queue
is rewaken core may call hinic_xmit_frame to send pkt after
netif_tx_disable within a short time which may results in accessing
memory that has been already freed in hinic_close. So we call
napi_disable before netif_tx_disable in hinic_close to fix this bug.

Fixes: 2eed5a8b614b ("hinic: add set_channels ethtool_ops support")
Signed-off-by: Luo bin <luobin9@huawei.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/huawei/hinic/hinic_main.c b/drivers/net/ethernet/huawei/hinic/hinic_main.c
index 501056f..28581bd 100644 (file)
--- a/drivers/net/ethernet/huawei/hinic/hinic_main.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_main.c
@@ -174,6 +174,24 @@ err_init_txq:
        return err;
 }
 
+static void enable_txqs_napi(struct hinic_dev *nic_dev)
+{
+       int num_txqs = hinic_hwdev_num_qps(nic_dev->hwdev);
+       int i;
+
+       for (i = 0; i < num_txqs; i++)
+               napi_enable(&nic_dev->txqs[i].napi);
+}
+
+static void disable_txqs_napi(struct hinic_dev *nic_dev)
+{
+       int num_txqs = hinic_hwdev_num_qps(nic_dev->hwdev);
+       int i;
+
+       for (i = 0; i < num_txqs; i++)
+               napi_disable(&nic_dev->txqs[i].napi);
+}
+
 /**
  * free_txqs - Free the Logical Tx Queues of specific NIC device
  * @nic_dev: the specific NIC device
@@ -400,6 +418,8 @@ int hinic_open(struct net_device *netdev)
                goto err_create_txqs;
        }
 
+       enable_txqs_napi(nic_dev);
+
        err = create_rxqs(nic_dev);
        if (err) {
                netif_err(nic_dev, drv, netdev,
@@ -484,6 +504,7 @@ err_port_state:
        }
 
 err_create_rxqs:
+       disable_txqs_napi(nic_dev);
        free_txqs(nic_dev);
 
 err_create_txqs:
@@ -497,6 +518,9 @@ int hinic_close(struct net_device *netdev)
        struct hinic_dev *nic_dev = netdev_priv(netdev);
        unsigned int flags;
 
+       /* Disable txq napi firstly to aviod rewaking txq in free_tx_poll */
+       disable_txqs_napi(nic_dev);
+
        down(&nic_dev->mgmt_lock);
 
        flags = nic_dev->flags;

diff --git a/drivers/net/ethernet/huawei/hinic/hinic_tx.c b/drivers/net/ethernet/huawei/hinic/hinic_tx.c
index a97498e..2b418b5 100644 (file)
--- a/drivers/net/ethernet/huawei/hinic/hinic_tx.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_tx.c
@@ -745,18 +745,6 @@ static int free_tx_poll(struct napi_struct *napi, int budget)
        return budget;
 }
 
-static void tx_napi_add(struct hinic_txq *txq, int weight)
-{
-       netif_napi_add(txq->netdev, &txq->napi, free_tx_poll, weight);
-       napi_enable(&txq->napi);
-}
-
-static void tx_napi_del(struct hinic_txq *txq)
-{
-       napi_disable(&txq->napi);
-       netif_napi_del(&txq->napi);
-}
-
 static irqreturn_t tx_irq(int irq, void *data)
 {
        struct hinic_txq *txq = data;
@@ -790,7 +778,7 @@ static int tx_request_irq(struct hinic_txq *txq)
 
        qp = container_of(sq, struct hinic_qp, sq);
 
-       tx_napi_add(txq, nic_dev->tx_weight);
+       netif_napi_add(txq->netdev, &txq->napi, free_tx_poll, nic_dev->tx_weight);
 
        hinic_hwdev_msix_set(nic_dev->hwdev, sq->msix_entry,
                             TX_IRQ_NO_PENDING, TX_IRQ_NO_COALESC,
@@ -807,14 +795,14 @@ static int tx_request_irq(struct hinic_txq *txq)
        if (err) {
                netif_err(nic_dev, drv, txq->netdev,
                          "Failed to set TX interrupt coalescing attribute\n");
-               tx_napi_del(txq);
+               netif_napi_del(&txq->napi);
                return err;
        }
 
        err = request_irq(sq->irq, tx_irq, 0, txq->irq_name, txq);
        if (err) {
                dev_err(&pdev->dev, "Failed to request Tx irq\n");
-               tx_napi_del(txq);
+               netif_napi_del(&txq->napi);
                return err;
        }
 
@@ -826,7 +814,7 @@ static void tx_free_irq(struct hinic_txq *txq)
        struct hinic_sq *sq = txq->sq;
 
        free_irq(sq->irq, txq);
-       tx_napi_del(txq);
+       netif_napi_del(&txq->napi);
 }
 
 /**