[BLUETOOTH]: Add conn add/del workqueues to avoid connection fail.

The bluetooth hci_conn sysfs add/del executed in the default
workqueue.  If the del_conn is executed after the new add_conn with
same target, add_conn will failed with warning of "same kobject name".

Here add btaddconn & btdelconn workqueues, flush the btdelconn
workqueue in the add_conn function to avoid the issue.

Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index 17f7fb7205535ce35f0fc9a7b96cdbf9d261c820..2726adc419d3ff248b75b93591c68b0a9d235b0e 100644 (file)
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -12,6 +12,8 @@
 #undef  BT_DBG
 #define BT_DBG(D...)
 #endif
+static struct workqueue_struct *btaddconn;
+static struct workqueue_struct *btdelconn;
 
 static inline char *typetostr(int type)
 {
@@ -279,6 +281,7 @@ static void add_conn(struct work_struct *work)
        struct hci_conn *conn = container_of(work, struct hci_conn, work);
        int i;
 
+       flush_workqueue(btdelconn);
        if (device_add(&conn->dev) < 0) {
                BT_ERR("Failed to register connection device");
                return;
@@ -313,6 +316,7 @@ void hci_conn_add_sysfs(struct hci_conn *conn)
 
        INIT_WORK(&conn->work, add_conn);
 
+       queue_work(btaddconn, &conn->work);
        schedule_work(&conn->work);
 }
 
@@ -349,6 +353,7 @@ void hci_conn_del_sysfs(struct hci_conn *conn)
 
        INIT_WORK(&conn->work, del_conn);
 
+       queue_work(btdelconn, &conn->work);
        schedule_work(&conn->work);
 }
 
@@ -398,31 +403,52 @@ int __init bt_sysfs_init(void)
 {
        int err;
 
+       btaddconn = create_singlethread_workqueue("btaddconn");
+       if (!btaddconn) {
+               err = -ENOMEM;
+               goto out;
+       }
+       btdelconn = create_singlethread_workqueue("btdelconn");
+       if (!btdelconn) {
+               err = -ENOMEM;
+               goto out_del;
+       }
+
        bt_platform = platform_device_register_simple("bluetooth", -1, NULL, 0);
-       if (IS_ERR(bt_platform))
-               return PTR_ERR(bt_platform);
+       if (IS_ERR(bt_platform)) {
+               err = PTR_ERR(bt_platform);
+               goto out_platform;
+       }
 
        err = bus_register(&bt_bus);
-       if (err < 0) {
-               platform_device_unregister(bt_platform);
-               return err;
-       }
+       if (err < 0)
+               goto out_bus;
 
        bt_class = class_create(THIS_MODULE, "bluetooth");
        if (IS_ERR(bt_class)) {
-               bus_unregister(&bt_bus);
-               platform_device_unregister(bt_platform);
-               return PTR_ERR(bt_class);
+               err = PTR_ERR(bt_class);
+               goto out_class;
        }
 
        return 0;
+
+out_class:
+       bus_unregister(&bt_bus);
+out_bus:
+       platform_device_unregister(bt_platform);
+out_platform:
+       destroy_workqueue(btdelconn);
+out_del:
+       destroy_workqueue(btaddconn);
+out:
+       return err;
 }
 
 void bt_sysfs_cleanup(void)
 {
+       destroy_workqueue(btaddconn);
+       destroy_workqueue(btdelconn);
        class_destroy(bt_class);
-
        bus_unregister(&bt_bus);
-
        platform_device_unregister(bt_platform);
 }