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hinic: fix rewaking txq after netif_tx_disable

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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: 2eed5a8b61 ("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>
This commit is contained in:
Luo bin 2020-09-10 22:04:40 +08:00 committed by David S. Miller
parent b5b73b26b3
commit a1b80e0143
2 changed files with 28 additions and 16 deletions
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24
drivers/net/ethernet/huawei/hinic/hinic_main.c
View file

@ -174,6 +174,24 @@ static int create_txqs(struct hinic_dev *nic_dev)
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 @@ int hinic_open(struct net_device *netdev)
}
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;

20
drivers/net/ethernet/huawei/hinic/hinic_tx.c
View file

@ -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);
}
/**