Bluetooth: Mark controller is down when HCI_AUTO_OFF is set

During the initial setup phase, the controller is powered on and will
be powered off again if it is not used within the auto-off timeout.

Userspace using ioctl does not know about the difference between the
initial setup phase and a controller being present. It is a bad idea
to keep the controller powered by just looking at the device list or
device information. Instead just tell userspace that the controller
is still down.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 3321c65..96e0acc 100644 (file)
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2817,14 +2817,20 @@ int hci_get_dev_list(void __user *arg)
 
        read_lock(&hci_dev_list_lock);
        list_for_each_entry(hdev, &hci_dev_list, list) {
-               if (test_and_clear_bit(HCI_AUTO_OFF, &hdev->dev_flags))
-                       cancel_delayed_work(&hdev->power_off);
+               unsigned long flags = hdev->flags;
+
+               /* When the auto-off is configured it means the transport
+                * is running, but in that case still indicate that the
+                * device is actually down.
+                */
+               if (test_bit(HCI_AUTO_OFF, &hdev->dev_flags))
+                       flags &= ~BIT(HCI_UP);
 
                if (!test_bit(HCI_MGMT, &hdev->dev_flags))
                        set_bit(HCI_PAIRABLE, &hdev->dev_flags);
 
                (dr + n)->dev_id  = hdev->id;
-               (dr + n)->dev_opt = hdev->flags;
+               (dr + n)->dev_opt = flags;
 
                if (++n >= dev_num)
                        break;
@@ -2844,6 +2850,7 @@ int hci_get_dev_info(void __user *arg)
 {
        struct hci_dev *hdev;
        struct hci_dev_info di;
+       unsigned long flags;
        int err = 0;
 
        if (copy_from_user(&di, arg, sizeof(di)))
@@ -2853,8 +2860,14 @@ int hci_get_dev_info(void __user *arg)
        if (!hdev)
                return -ENODEV;
 
-       if (test_and_clear_bit(HCI_AUTO_OFF, &hdev->dev_flags))
-               cancel_delayed_work_sync(&hdev->power_off);
+       /* When the auto-off is configured it means the transport
+        * is running, but in that case still indicate that the
+        * device is actually down.
+        */
+       if (test_bit(HCI_AUTO_OFF, &hdev->dev_flags))
+               flags = hdev->flags & ~BIT(HCI_UP);
+       else
+               flags = hdev->flags;
 
        if (!test_bit(HCI_MGMT, &hdev->dev_flags))
                set_bit(HCI_PAIRABLE, &hdev->dev_flags);
@@ -2862,7 +2875,7 @@ int hci_get_dev_info(void __user *arg)
        strcpy(di.name, hdev->name);
        di.bdaddr   = hdev->bdaddr;
        di.type     = (hdev->bus & 0x0f) | ((hdev->dev_type & 0x03) << 4);
-       di.flags    = hdev->flags;
+       di.flags    = flags;
        di.pkt_type = hdev->pkt_type;
        if (lmp_bredr_capable(hdev)) {
                di.acl_mtu  = hdev->acl_mtu;