** Also affects: linux-oem-6.11 (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: linux-oem-6.11 (Ubuntu Noble)
Assignee: (unassigned) => Leo Lin (0xff07)
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https://bugs.launchpad.net/bugs/2092473
Title:
[SRU] Fix system hang issue caused by the btmtk driver
Status in HWE Next:
New
Status in linux-oem-6.11 package in Ubuntu:
New
Status in linux-oem-6.11 source package in Noble:
New
Bug description:
[ Impact ]
On some machine with Mediatek USB bluetooth controller, activate
scanning will lead to system hang. This is due to unexpected null
pointer dereference in the set up flow.
[ Fix ]
Cherry-pick one commit from mainline linux:
61c5a3def90a (Bluetooth: btmtk: adjust the position to init iso
data anchor)
[ Test ]
1. Boot into the kenrel
2. Run bluetoothctl
3. In the bluetoothctl shell, run "scan on"
4. The MTK bluetooth usb device should be able to scan, and system should not
hang.
[ Where problems could occur ]
The call trace in the upstream commit shows that the intention for the
patch is to fix what was happening unexpected USB disconnect. However,
here in 6.11-oem the btusb_mtk_disconnect() in the call trace, which
is what usb_kill_anchored_urbs() an uninitailized usb anchor and lead
to the error, is not even implemented.
From the call trace collected we collected, the code path seems to be
btusb_disconnect()->hci_unregister_dev()->btmtk shutdwn callback.
However they all lead to calling the usb_kill_anchored_urbs() before
the same btmtk_data->isopkt_anchor is initialized by the
init_usb_anchor(). That's probably why the patch could fix the issue
here as well.
The upstream patch author didn't state when or why such "unexpected
USB disconnect during setup" might happen.
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