IB/usnic: Fix deadlock

There is a dead lock in usnic ib_register and netdev_notify path.

	usnic_ib_discover_pf()
	| mutex_lock(&usnic_ib_ibdev_list_lock);
	 | usnic_ib_device_add();
	  | ib_register_device()
	   | usnic_ib_query_port()
	    | mutex_lock(&us_ibdev->usdev_lock);
	     | ib_get_eth_speed()
	      | rtnl_lock()

order of lock: &usnic_ib_ibdev_list_lock -> usdev_lock -> rtnl_lock

	rtnl_lock()
	 | usnic_ib_netdevice_event()
	  | mutex_lock(&usnic_ib_ibdev_list_lock);

order of lock: rtnl_lock -> &usnic_ib_ibdev_list_lock

Solution is to use the core's lock-free ib_device_get_by_netdev() scheme
to lookup ib_dev while handling netdev & inet events.
Signed-off-by: Parvi Kaustubhi <pkaustub@cisco.com>
Reviewed-by: Govindarajulu Varadarajan <gvaradar@cisco.com>
Reviewed-by: Tanmay Inamdar <tinamdar@cisco.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/usnic/usnic_ib_main.c

@@ -216,18 +216,17 @@ static int usnic_ib_netdevice_event(struct notifier_block *notifier,
 					unsigned long event, void *ptr)
 {
 	struct usnic_ib_dev *us_ibdev;
+	struct ib_device *ibdev;
 
 	struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
 
-	mutex_lock(&usnic_ib_ibdev_list_lock);
-	list_for_each_entry(us_ibdev, &usnic_ib_ibdev_list, ib_dev_link) {
-		if (us_ibdev->netdev == netdev) {
-			usnic_ib_handle_usdev_event(us_ibdev, event);
-			break;
-		}
-	}
-	mutex_unlock(&usnic_ib_ibdev_list_lock);
+	ibdev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_USNIC);
+	if (!ibdev)
+		return NOTIFY_DONE;
 
+	us_ibdev = container_of(ibdev, struct usnic_ib_dev, ib_dev);
+	usnic_ib_handle_usdev_event(us_ibdev, event);
+	ib_device_put(ibdev);
 	return NOTIFY_DONE;
 }
 
@@ -282,16 +281,15 @@ static int usnic_ib_inetaddr_event(struct notifier_block *notifier,
 	struct usnic_ib_dev *us_ibdev;
 	struct in_ifaddr *ifa = ptr;
 	struct net_device *netdev = ifa->ifa_dev->dev;
+	struct ib_device *ibdev;
 
-	mutex_lock(&usnic_ib_ibdev_list_lock);
-	list_for_each_entry(us_ibdev, &usnic_ib_ibdev_list, ib_dev_link) {
-		if (us_ibdev->netdev == netdev) {
-			usnic_ib_handle_inet_event(us_ibdev, event, ptr);
-			break;
-		}
-	}
-	mutex_unlock(&usnic_ib_ibdev_list_lock);
+	ibdev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_USNIC);
+	if (!ibdev)
+		return NOTIFY_DONE;
 
+	us_ibdev = container_of(ibdev, struct usnic_ib_dev, ib_dev);
+	usnic_ib_handle_inet_event(us_ibdev, event, ptr);
+	ib_device_put(ibdev);
 	return NOTIFY_DONE;
 }
 static struct notifier_block usnic_ib_inetaddr_notifier = {
@@ -342,7 +340,6 @@ static const struct ib_device_ops usnic_dev_ops = {
 	.destroy_qp = usnic_ib_destroy_qp,
 	.get_dev_fw_str = usnic_get_dev_fw_str,
 	.get_link_layer = usnic_ib_port_link_layer,
-	.get_netdev = usnic_get_netdev,
 	.get_port_immutable = usnic_port_immutable,
 	.mmap = usnic_ib_mmap,
 	.modify_qp = usnic_ib_modify_qp,
@@ -362,6 +359,7 @@ static void *usnic_ib_device_add(struct pci_dev *dev)
 	union ib_gid gid;
 	struct in_device *ind;
 	struct net_device *netdev;
+	int ret;
 
 	usnic_dbg("\n");
 	netdev = pci_get_drvdata(dev);
@@ -416,6 +414,10 @@ static void *usnic_ib_device_add(struct pci_dev *dev)
 	us_ibdev->ib_dev.driver_id = RDMA_DRIVER_USNIC;
 	rdma_set_device_sysfs_group(&us_ibdev->ib_dev, &usnic_attr_group);
 
+	ret = ib_device_set_netdev(&us_ibdev->ib_dev, us_ibdev->netdev, 1);
+	if (ret)
+		goto err_fwd_dealloc;
+
 	if (ib_register_device(&us_ibdev->ib_dev, "usnic_%d"))
 		goto err_fwd_dealloc;
 

drivers/infiniband/hw/usnic/usnic_ib_verbs.c

@@ -437,16 +437,6 @@ int usnic_ib_query_gid(struct ib_device *ibdev, u8 port, int index,
 	return 0;
 }
 
-struct net_device *usnic_get_netdev(struct ib_device *device, u8 port_num)
-{
-	struct usnic_ib_dev *us_ibdev = to_usdev(device);
-
-	if (us_ibdev->netdev)
-		dev_hold(us_ibdev->netdev);
-
-	return us_ibdev->netdev;
-}
-
 int usnic_ib_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
 				u16 *pkey)
 {

drivers/infiniband/hw/usnic/usnic_ib_verbs.h

@@ -48,7 +48,6 @@ int usnic_ib_query_qp(struct ib_qp *qp, struct ib_qp_attr *qp_attr,
 				struct ib_qp_init_attr *qp_init_attr);
 int usnic_ib_query_gid(struct ib_device *ibdev, u8 port, int index,
 				union ib_gid *gid);
-struct net_device *usnic_get_netdev(struct ib_device *device, u8 port_num);
 int usnic_ib_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
 				u16 *pkey);
 int usnic_ib_alloc_pd(struct ib_pd *ibpd, struct ib_ucontext *context,