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cxgb4: Fix race condition in cleanup
There is a possible race condition when we unregister the PCI Driver and then flush/destroy the global "workq". This could lead to situations where there are tasks on the Work Queue with references to now deleted adapter data structures. Instead, have per-adapter Work Queues which were instantiated and torn down in init_one() and remove_one(), respectively. v2: Remove unnecessary call to flush_workqueue() before destroy_workqueue() Signed-off-by: Anish Bhatt <anish@chelsio.com> Signed-off-by: Casey Leedom <leedom@chelsio.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -652,6 +652,7 @@ struct adapter {
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struct tid_info tids;
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void **tid_release_head;
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spinlock_t tid_release_lock;
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struct workqueue_struct *workq;
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struct work_struct tid_release_task;
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struct work_struct db_full_task;
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struct work_struct db_drop_task;
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@ -643,8 +643,6 @@ static int set_rxmode(struct net_device *dev, int mtu, bool sleep_ok)
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return ret;
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}
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static struct workqueue_struct *workq;
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/**
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* link_start - enable a port
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* @dev: the port to enable
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@ -3340,7 +3338,7 @@ static void cxgb4_queue_tid_release(struct tid_info *t, unsigned int chan,
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adap->tid_release_head = (void **)((uintptr_t)p | chan);
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if (!adap->tid_release_task_busy) {
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adap->tid_release_task_busy = true;
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queue_work(workq, &adap->tid_release_task);
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queue_work(adap->workq, &adap->tid_release_task);
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}
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spin_unlock_bh(&adap->tid_release_lock);
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}
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@ -4140,7 +4138,7 @@ void t4_db_full(struct adapter *adap)
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notify_rdma_uld(adap, CXGB4_CONTROL_DB_FULL);
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t4_set_reg_field(adap, SGE_INT_ENABLE3,
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DBFIFO_HP_INT | DBFIFO_LP_INT, 0);
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queue_work(workq, &adap->db_full_task);
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queue_work(adap->workq, &adap->db_full_task);
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}
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}
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@ -4150,7 +4148,7 @@ void t4_db_dropped(struct adapter *adap)
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disable_dbs(adap);
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notify_rdma_uld(adap, CXGB4_CONTROL_DB_FULL);
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}
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queue_work(workq, &adap->db_drop_task);
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queue_work(adap->workq, &adap->db_drop_task);
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}
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static void uld_attach(struct adapter *adap, unsigned int uld)
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@ -6517,6 +6515,12 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
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goto out_disable_device;
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}
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adapter->workq = create_singlethread_workqueue("cxgb4");
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if (!adapter->workq) {
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err = -ENOMEM;
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goto out_free_adapter;
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}
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/* PCI device has been enabled */
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adapter->flags |= DEV_ENABLED;
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@ -6715,6 +6719,9 @@ sriov:
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out_unmap_bar0:
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iounmap(adapter->regs);
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out_free_adapter:
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if (adapter->workq)
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destroy_workqueue(adapter->workq);
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kfree(adapter);
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out_disable_device:
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pci_disable_pcie_error_reporting(pdev);
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@ -6736,6 +6743,11 @@ static void remove_one(struct pci_dev *pdev)
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if (adapter) {
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int i;
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/* Tear down per-adapter Work Queue first since it can contain
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* references to our adapter data structure.
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*/
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destroy_workqueue(adapter->workq);
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if (is_offload(adapter))
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detach_ulds(adapter);
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@ -6788,20 +6800,14 @@ static int __init cxgb4_init_module(void)
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{
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int ret;
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workq = create_singlethread_workqueue("cxgb4");
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if (!workq)
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return -ENOMEM;
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/* Debugfs support is optional, just warn if this fails */
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cxgb4_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
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if (!cxgb4_debugfs_root)
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pr_warn("could not create debugfs entry, continuing\n");
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ret = pci_register_driver(&cxgb4_driver);
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if (ret < 0) {
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if (ret < 0)
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debugfs_remove(cxgb4_debugfs_root);
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destroy_workqueue(workq);
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}
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register_inet6addr_notifier(&cxgb4_inet6addr_notifier);
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@ -6813,8 +6819,6 @@ static void __exit cxgb4_cleanup_module(void)
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unregister_inet6addr_notifier(&cxgb4_inet6addr_notifier);
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pci_unregister_driver(&cxgb4_driver);
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debugfs_remove(cxgb4_debugfs_root); /* NULL ok */
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flush_workqueue(workq);
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destroy_workqueue(workq);
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}
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module_init(cxgb4_init_module);
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