diff options
Diffstat (limited to 'net/bluetooth/hci_request.c')
| -rw-r--r-- | net/bluetooth/hci_request.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c index 759329bec399..cced1a8cc124 100644 --- a/net/bluetooth/hci_request.c +++ b/net/bluetooth/hci_request.c @@ -277,12 +277,16 @@ int hci_req_sync(struct hci_dev *hdev, int (*req)(struct hci_request *req, { int ret; - if (!test_bit(HCI_UP, &hdev->flags)) - return -ENETDOWN; - /* Serialize all requests */ hci_req_sync_lock(hdev); - ret = __hci_req_sync(hdev, req, opt, timeout, hci_status); + /* check the state after obtaing the lock to protect the HCI_UP + * against any races from hci_dev_do_close when the controller + * gets removed. + */ + if (test_bit(HCI_UP, &hdev->flags)) + ret = __hci_req_sync(hdev, req, opt, timeout, hci_status); + else + ret = -ENETDOWN; hci_req_sync_unlock(hdev); return ret; |