bnx2x: Using singlethread work queue

Since slow-path events, including link update, are handled in
work-queue, a race condition was introduced in the self-test that
sometimes caused the link status to fail: the self-test was running
under RTNL lock, and if the link-watch was scheduled it stoped the
shared work-queue (waiting for the RTNL lock) and so the link update
event was not handled until the self-test ended (releasing the RTNL
lock) with failure (since the link status was not updated)

Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 16 insertions, 6 deletions

diff --git a/drivers/net/bnx2x.h b/drivers/net/bnx2x.h
index fd705d1295a7..96a8889afbe1 100644
--- a/drivers/net/bnx2x.h
+++ b/drivers/net/bnx2x.h
@@ -811,7 +811,7 @@ struct bnx2x {
         int                     pm_cap;
         int                     pcie_cap;
 
-        struct work_struct      sp_task;
+        struct delayed_work     sp_task;
         struct work_struct      reset_task;
 
         struct timer_list       timer;
diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c
index 4be05847f86f..cc6ffba74592 100644
--- a/drivers/net/bnx2x_main.c
+++ b/drivers/net/bnx2x_main.c
@@ -95,6 +95,7 @@ MODULE_PARM_DESC(debug, "default debug msglevel");
 module_param(use_multi, int, 0);
 MODULE_PARM_DESC(use_multi, "use per-CPU queues");
 #endif
+static struct workqueue_struct *bnx2x_wq;
 
 enum bnx2x_board_type {
         BCM57710 = 0,
@@ -671,7 +672,8 @@ static void bnx2x_int_disable_sync(struct bnx2x *bp, int disable_hw)
                 synchronize_irq(bp->pdev->irq);
 
         /* make sure sp_task is not running */
-        cancel_work_sync(&bp->sp_task);
+        cancel_delayed_work(&bp->sp_task);
+        flush_workqueue(bnx2x_wq);
 }
 
 /* fast path */
@@ -1660,7 +1662,7 @@ static irqreturn_t bnx2x_interrupt(int irq, void *dev_instance)
 
 
         if (unlikely(status & 0x1)) {
-                schedule_work(&bp->sp_task);
+                queue_delayed_work(bnx2x_wq, &bp->sp_task, 0);
 
                 status &= ~0x1;
                 if (!status)
@@ -2820,7 +2822,7 @@ static void bnx2x_attn_int(struct bnx2x *bp)
 
 static void bnx2x_sp_task(struct work_struct *work)
 {
-        struct bnx2x *bp = container_of(work, struct bnx2x, sp_task);
+        struct bnx2x *bp = container_of(work, struct bnx2x, sp_task.work);
         u16 status;
 
 
@@ -2875,7 +2877,7 @@ static irqreturn_t bnx2x_msix_sp_int(int irq, void *dev_instance)
                 return IRQ_HANDLED;
 #endif
 
-        schedule_work(&bp->sp_task);
+        queue_delayed_work(bnx2x_wq, &bp->sp_task, 0);
 
         return IRQ_HANDLED;
 }
@@ -7501,7 +7503,7 @@ static int __devinit bnx2x_init_bp(struct bnx2x *bp)
 
         mutex_init(&bp->port.phy_mutex);
 
-        INIT_WORK(&bp->sp_task, bnx2x_sp_task);
+        INIT_DELAYED_WORK(&bp->sp_task, bnx2x_sp_task);
         INIT_WORK(&bp->reset_task, bnx2x_reset_task);
 
         rc = bnx2x_get_hwinfo(bp);
@@ -10519,12 +10521,20 @@ static struct pci_driver bnx2x_pci_driver = {
 
 static int __init bnx2x_init(void)
 {
+        bnx2x_wq = create_singlethread_workqueue("bnx2x");
+        if (bnx2x_wq == NULL) {
+                printk(KERN_ERR PFX "Cannot create workqueue\n");
+                return -ENOMEM;
+        }
+
         return pci_register_driver(&bnx2x_pci_driver);
 }
 
 static void __exit bnx2x_cleanup(void)
 {
         pci_unregister_driver(&bnx2x_pci_driver);
+
+        destroy_workqueue(bnx2x_wq);
 }
 
 module_init(bnx2x_init);