Hi, I submitted a bug on Bugzilla before, about Macbook pro 2015 Bluetooth issue Device ID 05ac:8290 Apple, Inc. Bluetooth Host Controller https://bugzilla.kernel.org/show_bug.cgi?id=197295 I tried to fix it myself first. And it seems that my fix works. Now no error message reported, and my Bluetooth speaker can produce sound I am new to both kernel develop and Bluetooth / USB driver develop, so I spend some time investigating and finally I end up with a patch like this (necessary debugging code truncated) @@ -1360,11 +1367,14 @@ static inline int __set_isoc_interface(struct hci_dev *hdev, int altsetting) struct usb_interface *intf = data->isoc; struct usb_endpoint_descriptor *ep_desc; int i, err; + /* Here isoc_tx_ep is not initialized */ + BT_INFO("[VOID]-__set_isoc_interface(3) called, altsetting = %d isoc_tx_ep = %p", altsetting, data->isoc_tx_ep); if (!data->isoc) return -ENODEV; - err = usb_set_interface(data->udev, 1, altsetting); + /* Here is what I changed */ + err = usb_set_interface(data->udev, 3, altsetting); Then it works now. But obviously, it's a workaround not a bugfix. And I do not have other test cases (I only have one Bluetooth speaker) Could you please give me some advice on the following questions? 1. Is this bug a Macbook Bluetooth USB Driver (btusb) bug? Or it's a Bluetooth device bug (Xiaomi Bluetooth speaker) I think it's a btusb bug, am I right? 2. Does this fix make sense? 3. Where can I get the specification of the certain device(i.e: ID = 05ac:8290) To see it's interface and altsetting definition Thanks in advance. -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
