Merge branch 'cnic'

Michael Chan says:

====================
cnic fixes

Fix 2 sleeping function from invalid context bugs and 1 missing iscsi netlink
message bug.

v2: Fixed typo in rcu_dereference_protected() and tested with CONFIG_PROVE_RCU
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 13 deletions

diff --git a/drivers/net/ethernet/broadcom/cnic.c b/drivers/net/ethernet/broadcom/cnic.c
index 09f3fefcbf9c..a4b25bc7113a 100644
--- a/drivers/net/ethernet/broadcom/cnic.c
+++ b/drivers/net/ethernet/broadcom/cnic.c
@@ -608,6 +608,10 @@ static int cnic_unregister_device(struct cnic_dev *dev, int ulp_type)
 		pr_err("%s: Bad type %d\n", __func__, ulp_type);
 		return -EINVAL;
 	}
+
+	if (ulp_type == CNIC_ULP_ISCSI)
+		cnic_send_nlmsg(cp, ISCSI_KEVENT_IF_DOWN, NULL);
+
 	mutex_lock(&cnic_lock);
 	if (rcu_dereference(cp->ulp_ops[ulp_type])) {
 		RCU_INIT_POINTER(cp->ulp_ops[ulp_type], NULL);
@@ -620,9 +624,7 @@ static int cnic_unregister_device(struct cnic_dev *dev, int ulp_type)
 	}
 	mutex_unlock(&cnic_lock);
 
-	if (ulp_type == CNIC_ULP_ISCSI)
-		cnic_send_nlmsg(cp, ISCSI_KEVENT_IF_DOWN, NULL);
-	else if (ulp_type == CNIC_ULP_FCOE)
+	if (ulp_type == CNIC_ULP_FCOE)
 		dev->fcoe_cap = NULL;
 
 	synchronize_rcu();
@@ -1039,21 +1041,17 @@ static int cnic_alloc_uio_rings(struct cnic_dev *dev, int pages)
 	struct cnic_local *cp = dev->cnic_priv;
 	struct cnic_uio_dev *udev;
 
-	read_lock(&cnic_dev_lock);
 	list_for_each_entry(udev, &cnic_udev_list, list) {
 		if (udev->pdev == dev->pcidev) {
 			udev->dev = dev;
 			if (__cnic_alloc_uio_rings(udev, pages)) {
 				udev->dev = NULL;
-				read_unlock(&cnic_dev_lock);
 				return -ENOMEM;
 			}
 			cp->udev = udev;
-			read_unlock(&cnic_dev_lock);
 			return 0;
 		}
 	}
-	read_unlock(&cnic_dev_lock);
 
 	udev = kzalloc(sizeof(struct cnic_uio_dev), GFP_ATOMIC);
 	if (!udev)
@@ -1067,9 +1065,7 @@ static int cnic_alloc_uio_rings(struct cnic_dev *dev, int pages)
 	if (__cnic_alloc_uio_rings(udev, pages))
 		goto err_udev;
 
-	write_lock(&cnic_dev_lock);
 	list_add(&udev->list, &cnic_udev_list);
-	write_unlock(&cnic_dev_lock);
 
 	pci_dev_get(udev->pdev);
 
@@ -5624,20 +5620,27 @@ static void cnic_rcv_netevent(struct cnic_local *cp, unsigned long event,
 {
 	int if_type;
 
-	rcu_read_lock();
 	for (if_type = 0; if_type < MAX_CNIC_ULP_TYPE; if_type++) {
 		struct cnic_ulp_ops *ulp_ops;
 		void *ctx;
 
-		ulp_ops = rcu_dereference(cp->ulp_ops[if_type]);
-		if (!ulp_ops || !ulp_ops->indicate_netevent)
+		mutex_lock(&cnic_lock);
+		ulp_ops = rcu_dereference_protected(cp->ulp_ops[if_type],
+						lockdep_is_held(&cnic_lock));
+		if (!ulp_ops || !ulp_ops->indicate_netevent) {
+			mutex_unlock(&cnic_lock);
 			continue;
+		}
 
 		ctx = cp->ulp_handle[if_type];
 
+		set_bit(ULP_F_CALL_PENDING, &cp->ulp_flags[if_type]);
+		mutex_unlock(&cnic_lock);
+
 		ulp_ops->indicate_netevent(ctx, event, vlan_id);
+
+		clear_bit(ULP_F_CALL_PENDING, &cp->ulp_flags[if_type]);
 	}
-	rcu_read_unlock();
 }
 
 /* netdev event handler */