Bluetooth: fix debugfs registration

Since commit ec6cef9cd98d ("Bluetooth: Fix SMP channel registration for
unconfigured controllers") the debugfs interface for unconfigured
controllers will be created when the controller is configured.

There is however currently nothing preventing a controller from being
configured multiple time (e.g. setting the device address using btmgmt)
which results in failed attempts to register the already registered
debugfs entries:

	debugfs: File 'features' in directory 'hci0' already present!
	debugfs: File 'manufacturer' in directory 'hci0' already present!
	debugfs: File 'hci_version' in directory 'hci0' already present!
	...
	debugfs: File 'quirk_simultaneous_discovery' in directory 'hci0' already present!

Add a controller flag to avoid trying to register the debugfs interface
more than once.

Fixes: ec6cef9cd98d ("Bluetooth: Fix SMP channel registration for unconfigured controllers")
Cc: stable@vger.kernel.org      # 4.0
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 07df96c..872dcb9 100644 (file)
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -350,6 +350,7 @@ enum {
 enum {
        HCI_SETUP,
        HCI_CONFIG,
+       HCI_DEBUGFS_CREATED,
        HCI_AUTO_OFF,
        HCI_RFKILLED,
        HCI_MGMT,

diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index a59695f..804cde4 100644 (file)
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -4551,6 +4551,9 @@ static int hci_init_sync(struct hci_dev *hdev)
            !hci_dev_test_flag(hdev, HCI_CONFIG))
                return 0;
 
+       if (hci_dev_test_and_set_flag(hdev, HCI_DEBUGFS_CREATED))
+               return 0;
+
        hci_debugfs_create_common(hdev);
 
        if (lmp_bredr_capable(hdev))