ibmvnic: Fix releasing of sub-CRQ IRQs in interrupt context

Schedule these XPORT event tasks in the shared workqueue
so that IRQs are not freed in an interrupt context when
sub-CRQs are released.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 213162d..0459d19 100644 (file)
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -3232,6 +3232,27 @@ static void ibmvnic_free_inflight(struct ibmvnic_adapter *adapter)
        spin_unlock_irqrestore(&adapter->inflight_lock, flags);
 }
 
+static void ibmvnic_xport_event(struct work_struct *work)
+{
+       struct ibmvnic_adapter *adapter = container_of(work,
+                                                      struct ibmvnic_adapter,
+                                                      ibmvnic_xport);
+       struct device *dev = &adapter->vdev->dev;
+       int rc;
+
+       ibmvnic_free_inflight(adapter);
+       release_sub_crqs(adapter);
+       if (adapter->migrated) {
+               rc = ibmvnic_reenable_crq_queue(adapter);
+               if (rc)
+                       dev_err(dev, "Error after enable rc=%ld\n", rc);
+               adapter->migrated = false;
+               rc = ibmvnic_send_crq_init(adapter);
+               if (rc)
+                       dev_err(dev, "Error sending init rc=%ld\n", rc);
+       }
+}
+
 static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
                               struct ibmvnic_adapter *adapter)
 {
@@ -3267,15 +3288,7 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
                if (gen_crq->cmd == IBMVNIC_PARTITION_MIGRATED) {
                        dev_info(dev, "Re-enabling adapter\n");
                        adapter->migrated = true;
-                       ibmvnic_free_inflight(adapter);
-                       release_sub_crqs(adapter);
-                       rc = ibmvnic_reenable_crq_queue(adapter);
-                       if (rc)
-                               dev_err(dev, "Error after enable rc=%ld\n", rc);
-                       adapter->migrated = false;
-                       rc = ibmvnic_send_crq_init(adapter);
-                       if (rc)
-                               dev_err(dev, "Error sending init rc=%ld\n", rc);
+                       schedule_work(&adapter->ibmvnic_xport);
                } else if (gen_crq->cmd == IBMVNIC_DEVICE_FAILOVER) {
                        dev_info(dev, "Backing device failover detected\n");
                        netif_carrier_off(netdev);
@@ -3284,8 +3297,7 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
                        /* The adapter lost the connection */
                        dev_err(dev, "Virtual Adapter failed (rc=%d)\n",
                                gen_crq->cmd);
-                       ibmvnic_free_inflight(adapter);
-                       release_sub_crqs(adapter);
+                       schedule_work(&adapter->ibmvnic_xport);
                }
                return;
        case IBMVNIC_CRQ_CMD_RSP:
@@ -3726,6 +3738,7 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
        SET_NETDEV_DEV(netdev, &dev->dev);
 
        INIT_WORK(&adapter->vnic_crq_init, handle_crq_init_rsp);
+       INIT_WORK(&adapter->ibmvnic_xport, ibmvnic_xport_event);
 
        spin_lock_init(&adapter->stats_lock);
 

diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h
index 878e2c0..dd775d9 100644 (file)
--- a/drivers/net/ethernet/ibm/ibmvnic.h
+++ b/drivers/net/ethernet/ibm/ibmvnic.h
@@ -1048,5 +1048,6 @@ struct ibmvnic_adapter {
        u8 map_id;
 
        struct work_struct vnic_crq_init;
+       struct work_struct ibmvnic_xport;
        bool failover;
 };