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>

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 0f5e59f..1780f16 100644 (file)
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -232,6 +232,7 @@ struct hci_dev {
        __u16           conn_info_min_age;
        __u16           conn_info_max_age;
        __u8            ssp_debug_mode;
+       __u8            hw_error_code;
        __u32           clock;
 
        __u16           devid_source;
@@ -293,6 +294,7 @@ struct hci_dev {
 
        struct work_struct      power_on;
        struct delayed_work     power_off;
+       struct work_struct      error_reset;
 
        __u16                   discov_timeout;
        struct delayed_work     discov_off;
@@ -369,6 +371,7 @@ struct hci_dev {
        int (*setup)(struct hci_dev *hdev);
        int (*send)(struct hci_dev *hdev, struct sk_buff *skb);
        void (*notify)(struct hci_dev *hdev, unsigned int evt);
+       void (*hw_error)(struct hci_dev *hdev, u8 code);
        int (*set_bdaddr)(struct hci_dev *hdev, const bdaddr_t *bdaddr);
 };
 

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index d4c9152..79693a9 100644 (file)
--- 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 4175470..a72a5f5 100644 (file)
--- 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)