ixgbe: Use private workqueue to avoid certain possible hangs

Use a private workqueue to avoid hangs that were otherwise possible
when performing stress tests, such as creating and destroying many
VFS repeatedly.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Tested-by: Darin Miller <darin.j.miller@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index c95042e..0918e32 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -172,6 +172,8 @@ MODULE_DESCRIPTION("Intel(R) 10 Gigabit PCI Express Network Driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(DRV_VERSION);
 
+static struct workqueue_struct *ixgbe_wq;
+
 static bool ixgbe_check_cfg_remove(struct ixgbe_hw *hw, struct pci_dev *pdev);
 
 static int ixgbe_read_pci_cfg_word_parent(struct ixgbe_adapter *adapter,
@@ -313,7 +315,7 @@ static void ixgbe_service_event_schedule(struct ixgbe_adapter *adapter)
        if (!test_bit(__IXGBE_DOWN, &adapter->state) &&
            !test_bit(__IXGBE_REMOVING, &adapter->state) &&
            !test_and_set_bit(__IXGBE_SERVICE_SCHED, &adapter->state))
-               schedule_work(&adapter->service_task);
+               queue_work(ixgbe_wq, &adapter->service_task);
 }
 
 static void ixgbe_remove_adapter(struct ixgbe_hw *hw)
@@ -9320,6 +9322,12 @@ static int __init ixgbe_init_module(void)
        pr_info("%s - version %s\n", ixgbe_driver_string, ixgbe_driver_version);
        pr_info("%s\n", ixgbe_copyright);
 
+       ixgbe_wq = create_singlethread_workqueue(ixgbe_driver_name);
+       if (!ixgbe_wq) {
+               pr_err("%s: Failed to create workqueue\n", ixgbe_driver_name);
+               return -ENOMEM;
+       }
+
        ixgbe_dbg_init();
 
        ret = pci_register_driver(&ixgbe_driver);
@@ -9351,6 +9359,10 @@ static void __exit ixgbe_exit_module(void)
        pci_unregister_driver(&ixgbe_driver);
 
        ixgbe_dbg_exit();
+       if (ixgbe_wq) {
+               destroy_workqueue(ixgbe_wq);
+               ixgbe_wq = NULL;
+       }
 }
 
 #ifdef CONFIG_IXGBE_DCA