[SCSI] scsi_dh_rdac: changes to collect the rdac debug information during the initial...

[safe/jmp/linux-2.6] / drivers / net / cnic.c

diff --git a/drivers/net/cnic.c b/drivers/net/cnic.c
index ecde186..74c3429 100644 (file)
--- a/drivers/net/cnic.c
+++ b/drivers/net/cnic.c
@@ -138,6 +138,16 @@ static struct cnic_dev *cnic_from_netdev(struct net_device *netdev)
        return NULL;
 }
 
+static inline void ulp_get(struct cnic_ulp_ops *ulp_ops)
+{
+       atomic_inc(&ulp_ops->ref_count);
+}
+
+static inline void ulp_put(struct cnic_ulp_ops *ulp_ops)
+{
+       atomic_dec(&ulp_ops->ref_count);
+}
+
 static void cnic_ctx_wr(struct cnic_dev *dev, u32 cid_addr, u32 off, u32 val)
 {
        struct cnic_local *cp = dev->cnic_priv;
@@ -358,6 +368,7 @@ int cnic_register_driver(int ulp_type, struct cnic_ulp_ops *ulp_ops)
        }
        read_unlock(&cnic_dev_lock);
 
+       atomic_set(&ulp_ops->ref_count, 0);
        rcu_assign_pointer(cnic_ulp_tbl[ulp_type], ulp_ops);
        mutex_unlock(&cnic_lock);
 
@@ -379,6 +390,8 @@ int cnic_register_driver(int ulp_type, struct cnic_ulp_ops *ulp_ops)
 int cnic_unregister_driver(int ulp_type)
 {
        struct cnic_dev *dev;
+       struct cnic_ulp_ops *ulp_ops;
+       int i = 0;
 
        if (ulp_type >= MAX_CNIC_ULP_TYPE) {
                printk(KERN_ERR PFX "cnic_unregister_driver: Bad type %d\n",
@@ -386,7 +399,8 @@ int cnic_unregister_driver(int ulp_type)
                return -EINVAL;
        }
        mutex_lock(&cnic_lock);
-       if (!cnic_ulp_tbl[ulp_type]) {
+       ulp_ops = cnic_ulp_tbl[ulp_type];
+       if (!ulp_ops) {
                printk(KERN_ERR PFX "cnic_unregister_driver: Type %d has not "
                                    "been registered\n", ulp_type);
                goto out_unlock;
@@ -411,6 +425,14 @@ int cnic_unregister_driver(int ulp_type)
 
        mutex_unlock(&cnic_lock);
        synchronize_rcu();
+       while ((atomic_read(&ulp_ops->ref_count) != 0) && (i < 20)) {
+               msleep(100);
+               i++;
+       }
+
+       if (atomic_read(&ulp_ops->ref_count) != 0)
+               printk(KERN_WARNING PFX "%s: Failed waiting for ref count to go"
+                                       " to zero.\n", dev->netdev->name);
        return 0;
 
 out_unlock:
@@ -466,6 +488,7 @@ EXPORT_SYMBOL(cnic_register_driver);
 static int cnic_unregister_device(struct cnic_dev *dev, int ulp_type)
 {
        struct cnic_local *cp = dev->cnic_priv;
+       int i = 0;
 
        if (ulp_type >= MAX_CNIC_ULP_TYPE) {
                printk(KERN_ERR PFX "cnic_unregister_device: Bad type %d\n",
@@ -486,6 +509,15 @@ static int cnic_unregister_device(struct cnic_dev *dev, int ulp_type)
 
        synchronize_rcu();
 
+       while (test_bit(ULP_F_CALL_PENDING, &cp->ulp_flags[ulp_type]) &&
+              i < 20) {
+               msleep(100);
+               i++;
+       }
+       if (test_bit(ULP_F_CALL_PENDING, &cp->ulp_flags[ulp_type]))
+               printk(KERN_WARNING PFX "%s: Failed waiting for ULP up call"
+                                       " to complete.\n", dev->netdev->name);
+
        return 0;
 }
 EXPORT_SYMBOL(cnic_unregister_driver);
@@ -1076,18 +1108,23 @@ static void cnic_ulp_stop(struct cnic_dev *dev)
        if (cp->cnic_uinfo)
                cnic_send_nlmsg(cp, ISCSI_KEVENT_IF_DOWN, NULL);
 
-       rcu_read_lock();
        for (if_type = 0; if_type < MAX_CNIC_ULP_TYPE; if_type++) {
                struct cnic_ulp_ops *ulp_ops;
 
-               ulp_ops = rcu_dereference(cp->ulp_ops[if_type]);
-               if (!ulp_ops)
+               mutex_lock(&cnic_lock);
+               ulp_ops = cp->ulp_ops[if_type];
+               if (!ulp_ops) {
+                       mutex_unlock(&cnic_lock);
                        continue;
+               }
+               set_bit(ULP_F_CALL_PENDING, &cp->ulp_flags[if_type]);
+               mutex_unlock(&cnic_lock);
 
                if (test_and_clear_bit(ULP_F_START, &cp->ulp_flags[if_type]))
                        ulp_ops->cnic_stop(cp->ulp_handle[if_type]);
+
+               clear_bit(ULP_F_CALL_PENDING, &cp->ulp_flags[if_type]);
        }
-       rcu_read_unlock();
 }
 
 static void cnic_ulp_start(struct cnic_dev *dev)
@@ -1095,18 +1132,23 @@ static void cnic_ulp_start(struct cnic_dev *dev)
        struct cnic_local *cp = dev->cnic_priv;
        int if_type;
 
-       rcu_read_lock();
        for (if_type = 0; if_type < MAX_CNIC_ULP_TYPE; if_type++) {
                struct cnic_ulp_ops *ulp_ops;
 
-               ulp_ops = rcu_dereference(cp->ulp_ops[if_type]);
-               if (!ulp_ops || !ulp_ops->cnic_start)
+               mutex_lock(&cnic_lock);
+               ulp_ops = cp->ulp_ops[if_type];
+               if (!ulp_ops || !ulp_ops->cnic_start) {
+                       mutex_unlock(&cnic_lock);
                        continue;
+               }
+               set_bit(ULP_F_CALL_PENDING, &cp->ulp_flags[if_type]);
+               mutex_unlock(&cnic_lock);
 
                if (!test_and_set_bit(ULP_F_START, &cp->ulp_flags[if_type]))
                        ulp_ops->cnic_start(cp->ulp_handle[if_type]);
+
+               clear_bit(ULP_F_CALL_PENDING, &cp->ulp_flags[if_type]);
        }
-       rcu_read_unlock();
 }
 
 static int cnic_ctl(void *data, struct cnic_ctl_info *info)
@@ -1116,22 +1158,18 @@ static int cnic_ctl(void *data, struct cnic_ctl_info *info)
        switch (info->cmd) {
        case CNIC_CTL_STOP_CMD:
                cnic_hold(dev);
-               mutex_lock(&cnic_lock);
 
                cnic_ulp_stop(dev);
                cnic_stop_hw(dev);
 
-               mutex_unlock(&cnic_lock);
                cnic_put(dev);
                break;
        case CNIC_CTL_START_CMD:
                cnic_hold(dev);
-               mutex_lock(&cnic_lock);
 
                if (!cnic_start_hw(dev))
                        cnic_ulp_start(dev);
 
-               mutex_unlock(&cnic_lock);
                cnic_put(dev);
                break;
        default:
@@ -1145,19 +1183,23 @@ static void cnic_ulp_init(struct cnic_dev *dev)
        int i;
        struct cnic_local *cp = dev->cnic_priv;
 
-       rcu_read_lock();
        for (i = 0; i < MAX_CNIC_ULP_TYPE_EXT; i++) {
                struct cnic_ulp_ops *ulp_ops;
 
-               ulp_ops = rcu_dereference(cnic_ulp_tbl[i]);
-               if (!ulp_ops || !ulp_ops->cnic_init)
+               mutex_lock(&cnic_lock);
+               ulp_ops = cnic_ulp_tbl[i];
+               if (!ulp_ops || !ulp_ops->cnic_init) {
+                       mutex_unlock(&cnic_lock);
                        continue;
+               }
+               ulp_get(ulp_ops);
+               mutex_unlock(&cnic_lock);
 
                if (!test_and_set_bit(ULP_F_INIT, &cp->ulp_flags[i]))
                        ulp_ops->cnic_init(dev);
 
+               ulp_put(ulp_ops);
        }
-       rcu_read_unlock();
 }
 
 static void cnic_ulp_exit(struct cnic_dev *dev)
@@ -1165,19 +1207,23 @@ static void cnic_ulp_exit(struct cnic_dev *dev)
        int i;
        struct cnic_local *cp = dev->cnic_priv;
 
-       rcu_read_lock();
        for (i = 0; i < MAX_CNIC_ULP_TYPE_EXT; i++) {
                struct cnic_ulp_ops *ulp_ops;
 
-               ulp_ops = rcu_dereference(cnic_ulp_tbl[i]);
-               if (!ulp_ops || !ulp_ops->cnic_exit)
+               mutex_lock(&cnic_lock);
+               ulp_ops = cnic_ulp_tbl[i];
+               if (!ulp_ops || !ulp_ops->cnic_exit) {
+                       mutex_unlock(&cnic_lock);
                        continue;
+               }
+               ulp_get(ulp_ops);
+               mutex_unlock(&cnic_lock);
 
                if (test_and_clear_bit(ULP_F_INIT, &cp->ulp_flags[i]))
                        ulp_ops->cnic_exit(dev);
 
+               ulp_put(ulp_ops);
        }
-       rcu_read_unlock();
 }
 
 static int cnic_cm_offload_pg(struct cnic_sock *csk)
@@ -2393,21 +2439,45 @@ static int cnic_start_bnx2_hw(struct cnic_dev *dev)
        return 0;
 }
 
-static int cnic_start_hw(struct cnic_dev *dev)
+static int cnic_register_netdev(struct cnic_dev *dev)
 {
        struct cnic_local *cp = dev->cnic_priv;
        struct cnic_eth_dev *ethdev = cp->ethdev;
        int err;
 
-       if (test_bit(CNIC_F_CNIC_UP, &dev->flags))
-               return -EALREADY;
+       if (!ethdev)
+               return -ENODEV;
+
+       if (ethdev->drv_state & CNIC_DRV_STATE_REGD)
+               return 0;
 
        err = ethdev->drv_register_cnic(dev->netdev, cp->cnic_ops, dev);
-       if (err) {
+       if (err)
                printk(KERN_ERR PFX "%s: register_cnic failed\n",
                       dev->netdev->name);
-               goto err2;
-       }
+
+       return err;
+}
+
+static void cnic_unregister_netdev(struct cnic_dev *dev)
+{
+       struct cnic_local *cp = dev->cnic_priv;
+       struct cnic_eth_dev *ethdev = cp->ethdev;
+
+       if (!ethdev)
+               return;
+
+       ethdev->drv_unregister_cnic(dev->netdev);
+}
+
+static int cnic_start_hw(struct cnic_dev *dev)
+{
+       struct cnic_local *cp = dev->cnic_priv;
+       struct cnic_eth_dev *ethdev = cp->ethdev;
+       int err;
+
+       if (test_bit(CNIC_F_CNIC_UP, &dev->flags))
+               return -EALREADY;
 
        dev->regview = ethdev->io_base;
        cp->chip_id = ethdev->chip_id;
@@ -2438,18 +2508,13 @@ static int cnic_start_hw(struct cnic_dev *dev)
        return 0;
 
 err1:
-       ethdev->drv_unregister_cnic(dev->netdev);
        cp->free_resc(dev);
        pci_dev_put(dev->pcidev);
-err2:
        return err;
 }
 
 static void cnic_stop_bnx2_hw(struct cnic_dev *dev)
 {
-       struct cnic_local *cp = dev->cnic_priv;
-       struct cnic_eth_dev *ethdev = cp->ethdev;
-
        cnic_disable_bnx2_int_sync(dev);
 
        cnic_reg_wr_ind(dev, BNX2_CP_SCRATCH + 0x20, 0);
@@ -2461,8 +2526,6 @@ static void cnic_stop_bnx2_hw(struct cnic_dev *dev)
        cnic_setup_5709_context(dev, 0);
        cnic_free_irq(dev);
 
-       ethdev->drv_unregister_cnic(dev->netdev);
-
        cnic_free_resc(dev);
 }
 
@@ -2646,10 +2709,12 @@ static int cnic_netdev_event(struct notifier_block *this, unsigned long event,
                else if (event == NETDEV_UNREGISTER)
                        cnic_ulp_exit(dev);
                else if (event == NETDEV_UP) {
-                       mutex_lock(&cnic_lock);
+                       if (cnic_register_netdev(dev) != 0) {
+                               cnic_put(dev);
+                               goto done;
+                       }
                        if (!cnic_start_hw(dev))
                                cnic_ulp_start(dev);
-                       mutex_unlock(&cnic_lock);
                }
 
                rcu_read_lock();
@@ -2668,10 +2733,9 @@ static int cnic_netdev_event(struct notifier_block *this, unsigned long event,
                rcu_read_unlock();
 
                if (event == NETDEV_GOING_DOWN) {
-                       mutex_lock(&cnic_lock);
                        cnic_ulp_stop(dev);
                        cnic_stop_hw(dev);
-                       mutex_unlock(&cnic_lock);
+                       cnic_unregister_netdev(dev);
                } else if (event == NETDEV_UNREGISTER) {
                        write_lock(&cnic_dev_lock);
                        list_del_init(&dev->list);
@@ -2703,6 +2767,7 @@ static void cnic_release(void)
                }
 
                cnic_ulp_exit(dev);
+               cnic_unregister_netdev(dev);
                list_del_init(&dev->list);
                cnic_free_dev(dev);
        }