From bc4445c72cb5d1ed5af80c73e60214ab5ebd8e55 Mon Sep 17 00:00:00 2001 From: Andre Guedes Date: Fri, 8 Mar 2013 11:20:13 -0300 Subject: [PATCH] Bluetooth: Fix __hci_req_sync If hci_req_run returns error, we erroneously leave the current process in TASK_INTERRUPTABLE state. If we leave the process in TASK_INTERRUPTABLE and it is preempted, this process will never be scheduled again. This patch fixes this issue by moving the preparation for scheduling (add to waitqueue and set process state) to just after the hci_req_run call. Signed-off-by: Andre Guedes Acked-by: Johan Hedberg Signed-off-by: Gustavo Padovan --- net/bluetooth/hci_core.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 3fc699db8fb..5c643984728 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -95,15 +95,11 @@ static int __hci_req_sync(struct hci_dev *hdev, hdev->req_status = HCI_REQ_PEND; - add_wait_queue(&hdev->req_wait_q, &wait); - set_current_state(TASK_INTERRUPTIBLE); - func(&req, opt); err = hci_req_run(&req, hci_req_sync_complete); if (err < 0) { hdev->req_status = 0; - remove_wait_queue(&hdev->req_wait_q, &wait); /* req_run will fail if the request did not add any * commands to the queue, something that can happen when * a request with conditionals doesn't trigger any @@ -113,6 +109,9 @@ static int __hci_req_sync(struct hci_dev *hdev, return 0; } + add_wait_queue(&hdev->req_wait_q, &wait); + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(timeout); remove_wait_queue(&hdev->req_wait_q, &wait); -- 2.41.0