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cxgb4: Fix race condition in cleanup

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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>
This commit is contained in:
Anish Bhatt 2014-08-20 13:44:06 -07:00 committed by David S. Miller
parent 061079ac0b
commit 29aaee65bc
2 changed files with 19 additions and 14 deletions
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1
drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
View File

@ -652,6 +652,7 @@ struct adapter {
struct tid_info tids;
void **tid_release_head;
spinlock_t tid_release_lock;
struct workqueue_struct *workq;
struct work_struct tid_release_task;
struct work_struct db_full_task;
struct work_struct db_drop_task;

32
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
View File

@ -643,8 +643,6 @@ static int set_rxmode(struct net_device *dev, int mtu, bool sleep_ok)
return ret;
}
static struct workqueue_struct *workq;
/**
* link_start - enable a port
* @dev: the port to enable
@ -3340,7 +3338,7 @@ static void cxgb4_queue_tid_release(struct tid_info *t, unsigned int chan,
adap->tid_release_head = (void **)((uintptr_t)p | chan);
if (!adap->tid_release_task_busy) {
adap->tid_release_task_busy = true;
queue_work(workq, &adap->tid_release_task);
queue_work(adap->workq, &adap->tid_release_task);
}
spin_unlock_bh(&adap->tid_release_lock);
}
@ -4140,7 +4138,7 @@ void t4_db_full(struct adapter *adap)
notify_rdma_uld(adap, CXGB4_CONTROL_DB_FULL);
t4_set_reg_field(adap, SGE_INT_ENABLE3,
DBFIFO_HP_INT | DBFIFO_LP_INT, 0);
queue_work(workq, &adap->db_full_task);
queue_work(adap->workq, &adap->db_full_task);
}
}
@ -4150,7 +4148,7 @@ void t4_db_dropped(struct adapter *adap)
disable_dbs(adap);
notify_rdma_uld(adap, CXGB4_CONTROL_DB_FULL);
}
queue_work(workq, &adap->db_drop_task);
queue_work(adap->workq, &adap->db_drop_task);
}
static void uld_attach(struct adapter *adap, unsigned int uld)
@ -6517,6 +6515,12 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
goto out_disable_device;
}
adapter->workq = create_singlethread_workqueue("cxgb4");
if (!adapter->workq) {
err = -ENOMEM;
goto out_free_adapter;
}
/* PCI device has been enabled */
adapter->flags |= DEV_ENABLED;
@ -6715,6 +6719,9 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
out_unmap_bar0:
iounmap(adapter->regs);
out_free_adapter:
if (adapter->workq)
destroy_workqueue(adapter->workq);
kfree(adapter);
out_disable_device:
pci_disable_pcie_error_reporting(pdev);
@ -6736,6 +6743,11 @@ static void remove_one(struct pci_dev *pdev)
if (adapter) {
int i;
/* Tear down per-adapter Work Queue first since it can contain
* references to our adapter data structure.
*/
destroy_workqueue(adapter->workq);
if (is_offload(adapter))
detach_ulds(adapter);
@ -6788,20 +6800,14 @@ static int __init cxgb4_init_module(void)
{
int ret;
workq = create_singlethread_workqueue("cxgb4");
if (!workq)
return -ENOMEM;
/* Debugfs support is optional, just warn if this fails */
cxgb4_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
if (!cxgb4_debugfs_root)
pr_warn("could not create debugfs entry, continuing\n");
ret = pci_register_driver(&cxgb4_driver);
if (ret < 0) {
if (ret < 0)
debugfs_remove(cxgb4_debugfs_root);
destroy_workqueue(workq);
}
register_inet6addr_notifier(&cxgb4_inet6addr_notifier);
@ -6813,8 +6819,6 @@ static void __exit cxgb4_cleanup_module(void)
unregister_inet6addr_notifier(&cxgb4_inet6addr_notifier);
pci_unregister_driver(&cxgb4_driver);
debugfs_remove(cxgb4_debugfs_root); /* NULL ok */
flush_workqueue(workq);
destroy_workqueue(workq);
}
module_init(cxgb4_init_module);