Bluetooth: btusb: Cancel sync commands for certain URB errors

Cancel sync commands when transmission of URBs fail. This is done for
both failures to send a command URB and also when the interrupt URB used
to retrieve a response fails.

This approach is sufficient to quickly deal with certain errors such as
a device being disconnected while synchronous commands are done during
initialization.

Signed-off-by: Benjamin Berg <bberg@redhat.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index ab169fc..d9067a8 100644 (file)
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -933,6 +933,8 @@ static void btusb_intr_complete(struct urb *urb)
                if (err != -EPERM && err != -ENODEV)
                        bt_dev_err(hdev, "urb %p failed to resubmit (%d)",
                                   urb, -err);
+               if (err != -EPERM)
+                       hci_cmd_sync_cancel(hdev, -err);
                usb_unanchor_urb(urb);
        }
 }
@@ -976,6 +978,8 @@ static int btusb_submit_intr_urb(struct hci_dev *hdev, gfp_t mem_flags)
                if (err != -EPERM && err != -ENODEV)
                        bt_dev_err(hdev, "urb %p submission failed (%d)",
                                   urb, -err);
+               if (err != -EPERM)
+                       hci_cmd_sync_cancel(hdev, -err);
                usb_unanchor_urb(urb);
        }
 
@@ -1331,10 +1335,13 @@ static void btusb_tx_complete(struct urb *urb)
        if (!test_bit(HCI_RUNNING, &hdev->flags))
                goto done;
 
-       if (!urb->status)
+       if (!urb->status) {
                hdev->stat.byte_tx += urb->transfer_buffer_length;
-       else
+       } else {
+               if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT)
+                       hci_cmd_sync_cancel(hdev, -urb->status);
                hdev->stat.err_tx++;
+       }
 
 done:
        spin_lock_irqsave(&data->txlock, flags);