From 3e13fa1e1fab479940728272b6425d343e0c0f84 Mon Sep 17 00:00:00 2001 From: Andre Guedes Date: Wed, 27 Mar 2013 20:04:56 -0300 Subject: [PATCH] Bluetooth: Fix hci_inquiry ioctl usage Since the HCI request framework was properly fixed, the hci_req_sync call, in hci_inquiry, will return as soon as the HCI command completes (not the Inquiry procedure). However, in inquiry ioctl implementation, we want to sleep the user process until the inquiry procedure finishes. This patch changes hci_inquiry so, in case the HCI Inquiry command was executed successfully, it waits the HCI_INQUIRY flag to be cleared. This way, the user process will sleep until the inquiry procedure finishes. Signed-off-by: Andre Guedes Signed-off-by: Johan Hedberg --- net/bluetooth/hci_core.c | 13 +++++++++++++ net/bluetooth/hci_event.c | 5 +++++ 2 files changed, 18 insertions(+) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index cfcad5423f1c..123992984a7c 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -818,6 +818,12 @@ static void hci_inq_req(struct hci_request *req, unsigned long opt) hci_req_add(req, HCI_OP_INQUIRY, sizeof(cp), &cp); } +static int wait_inquiry(void *word) +{ + schedule(); + return signal_pending(current); +} + int hci_inquiry(void __user *arg) { __u8 __user *ptr = arg; @@ -849,6 +855,13 @@ int hci_inquiry(void __user *arg) timeo); if (err < 0) goto done; + + /* Wait until Inquiry procedure finishes (HCI_INQUIRY flag is + * cleared). If it is interrupted by a signal, return -EINTR. + */ + if (wait_on_bit(&hdev->flags, HCI_INQUIRY, wait_inquiry, + TASK_INTERRUPTIBLE)) + return -EINTR; } /* for unlimited number of responses we will use buffer with diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 8efb9c0d9b2c..7e7fbca59439 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -48,6 +48,8 @@ static void hci_cc_inquiry_cancel(struct hci_dev *hdev, struct sk_buff *skb) } clear_bit(HCI_INQUIRY, &hdev->flags); + smp_mb__after_clear_bit(); /* wake_up_bit advises about this barrier */ + wake_up_bit(&hdev->flags, HCI_INQUIRY); hci_dev_lock(hdev); hci_discovery_set_state(hdev, DISCOVERY_STOPPED); @@ -1603,6 +1605,9 @@ static void hci_inquiry_complete_evt(struct hci_dev *hdev, struct sk_buff *skb) if (!test_and_clear_bit(HCI_INQUIRY, &hdev->flags)) return; + smp_mb__after_clear_bit(); /* wake_up_bit advises about this barrier */ + wake_up_bit(&hdev->flags, HCI_INQUIRY); + if (!test_bit(HCI_MGMT, &hdev->dev_flags)) return; -- 2.20.1