NTB: Disable interrupts and poll under high load

[karo-tx-linux.git] / drivers / ntb / ntb_transport.c

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 172501d476009ae8035826136dddf22b975ed5b5..676937bd679c7b8ac5b41cf775bc84d7b2ae6a4f 100644 (file)
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -119,7 +119,6 @@ struct ntb_transport_qp {
 
        void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data,
                            void *data, int len);
-       struct tasklet_struct rx_work;
        struct list_head rx_pend_q;
        struct list_head rx_free_q;
        spinlock_t ntb_rx_pend_q_lock;
@@ -1188,11 +1187,14 @@ err:
        goto out;
 }
 
-static void ntb_transport_rx(unsigned long data)
+static int ntb_transport_rxc_db(void *data, int db_num)
 {
-       struct ntb_transport_qp *qp = (struct ntb_transport_qp *)data;
+       struct ntb_transport_qp *qp = data;
        int rc, i;
 
+       dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n",
+               __func__, db_num);
+
        /* Limit the number of packets processed in a single interrupt to
         * provide fairness to others
         */
@@ -1204,16 +1206,8 @@ static void ntb_transport_rx(unsigned long data)
 
        if (qp->dma_chan)
                dma_async_issue_pending(qp->dma_chan);
-}
-
-static void ntb_transport_rxc_db(void *data, int db_num)
-{
-       struct ntb_transport_qp *qp = data;
 
-       dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n",
-               __func__, db_num);
-
-       tasklet_schedule(&qp->rx_work);
+       return i;
 }
 
 static void ntb_tx_copy_callback(void *data)
@@ -1446,19 +1440,15 @@ ntb_transport_create_queue(void *data, struct pci_dev *pdev,
                             &qp->tx_free_q);
        }
 
-       tasklet_init(&qp->rx_work, ntb_transport_rx, (unsigned long) qp);
-
        rc = ntb_register_db_callback(qp->ndev, free_queue, qp,
                                      ntb_transport_rxc_db);
        if (rc)
-               goto err3;
+               goto err2;
 
        dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num);
 
        return qp;
 
-err3:
-       tasklet_disable(&qp->rx_work);
 err2:
        while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q)))
                kfree(entry);
@@ -1505,7 +1495,6 @@ void ntb_transport_free_queue(struct ntb_transport_qp *qp)
        }
 
        ntb_unregister_db_callback(qp->ndev, qp->qp_num);
-       tasklet_disable(&qp->rx_work);
 
        cancel_delayed_work_sync(&qp->link_work);