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| author | Sonny Sasaka <sonnysasaka@chromium.org> | 2021-03-15 10:30:59 -0700 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2021-03-15 21:06:51 +0100 |
| commit | c06632a4ec3a7b823f0e9c04cd4836135bba44bf (patch) | |
| tree | adc63ccdd95af1492dbbe23ac936fd16228e5300 /net/bluetooth | |
| parent | c1a74160eaf1ac218733b371158432b52601beff (diff) | |
| download | linux-c06632a4ec3a7b823f0e9c04cd4836135bba44bf.tar.gz | |
Bluetooth: Cancel le_scan_restart work when stopping discovery
Not cancelling it has caused a bug where passive background scanning is
disabled out of the blue, preventing BLE keyboards/mice to reconnect.
Here is how it happens:
After hci_req_stop_discovery, there is still le_scan_restart_work
scheduled. Invocation of le_scan_restart_work causes a harmful
le_scan_disable_work to be scheduled. This le_scan_disable_work will
eventually disable passive scanning when the timer fires.
Sample btmon trace:
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7
Type: Passive (0x00)
Interval: 367.500 msec (0x024c)
Window: 37.500 msec (0x003c)
Own address type: Public (0x00)
Filter policy: Accept all advertisement (0x00)
> HCI Event: Command Complete (0x0e) plen 4
LE Set Scan Parameters (0x08|0x000b) ncmd 1
Status: Success (0x00)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2
Scanning: Enabled (0x01)
Filter duplicates: Disabled (0x00)
> HCI Event: Command Complete (0x0e) plen 4
LE Set Scan Enable (0x08|0x000c) ncmd 2
Status: Success (0x00)
...
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2
Scanning: Disabled (0x00)
Filter duplicates: Disabled (0x00)
> HCI Event: Command Complete (0x0e) plen 4
LE Set Scan Enable (0x08|0x000c) ncmd 2
Status: Success (0x00)
// Background scanning is not working here onwards.
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Signed-off-by: Sonny Sasaka <sonnysasaka@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth')
| -rw-r--r-- | net/bluetooth/hci_request.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c index d7ee11ef70d3..8ace5d34b01e 100644 --- a/net/bluetooth/hci_request.c +++ b/net/bluetooth/hci_request.c @@ -3252,6 +3252,7 @@ bool hci_req_stop_discovery(struct hci_request *req) if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) { cancel_delayed_work(&hdev->le_scan_disable); + cancel_delayed_work(&hdev->le_scan_restart); hci_req_add_le_scan_disable(req, false); } |