Bluetooth: Perform a power cycle when receiving hardware error event

When receiving a HCI Hardware Error event, the controller should be
assumed to be non-functional until issuing a HCI Reset command.

The Bluetooth hardware errors are vendor specific and so add a
new hdev->hw_error callback that drivers can provide to run extra
code to handle the hardware error.

After completing the vendor specific error handling perform a full
reset of the Bluetooth stack by closing and re-opening the transport.

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

2 files changed, 24 insertions, 1 deletions

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index d4c9152474a9..79693a9ef4eb 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2151,6 +2151,26 @@ static void hci_power_off(struct work_struct *work)
         smp_unregister(hdev);
 }
 
+static void hci_error_reset(struct work_struct *work)
+{
+        struct hci_dev *hdev = container_of(work, struct hci_dev, error_reset);
+
+        BT_DBG("%s", hdev->name);
+
+        if (hdev->hw_error)
+                hdev->hw_error(hdev, hdev->hw_error_code);
+        else
+                BT_ERR("%s hardware error 0x%2.2x", hdev->name,
+                       hdev->hw_error_code);
+
+        if (hci_dev_do_close(hdev))
+                return;
+
+        smp_unregister(hdev);
+
+        hci_dev_do_open(hdev);
+}
+
 static void hci_discov_off(struct work_struct *work)
 {
         struct hci_dev *hdev;
@@ -2943,6 +2963,7 @@ struct hci_dev *hci_alloc_dev(void)
         INIT_WORK(&hdev->cmd_work, hci_cmd_work);
         INIT_WORK(&hdev->tx_work, hci_tx_work);
         INIT_WORK(&hdev->power_on, hci_power_on);
+        INIT_WORK(&hdev->error_reset, hci_error_reset);
 
         INIT_DELAYED_WORK(&hdev->power_off, hci_power_off);
         INIT_DELAYED_WORK(&hdev->discov_off, hci_discov_off);
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 4175470ff48e..a72a5f50728d 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -3100,7 +3100,9 @@ static void hci_hardware_error_evt(struct hci_dev *hdev, struct sk_buff *skb)
 {
         struct hci_ev_hardware_error *ev = (void *) skb->data;
 
-        BT_ERR("%s hardware error 0x%2.2x", hdev->name, ev->code);
+        hdev->hw_error_code = ev->code;
+
+        queue_work(hdev->req_workqueue, &hdev->error_reset);
 }
 
 static void hci_role_change_evt(struct hci_dev *hdev, struct sk_buff *skb)