[Bug 216683] [REGRESSION] HCI_QUIRK_NO_SUSPEND_NOTIFIER causes kernel panic on fake CSR 5.0 clones

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216683

--- Comment #9 from JustANormalTinkererMihir (justanormaltinkerermihir@duck.com) ---
(In reply to The Linux kernel's regression tracker (Thorsten Leemhuis) from
comment #7)
What sort of update do you require? As far as I can tell
HCI_QUIRK_NO_SUSPEND_NOTIFIER causes this regression, and the dongle continues
to work fine after just removing the line. One thing I have noticed in the
dmesg log is that the dongle sometimes disconnects and reconnects, this is
largely the reason why the kernel fault even occurs, it disconnects and
reconnects like this:
[   53.494546] Bluetooth: RFCOMM TTY layer initialized
[   53.494558] Bluetooth: RFCOMM socket layer initialized
[   53.494561] Bluetooth: RFCOMM ver 1.11
[   60.757711] rfkill: input handler disabled
[   73.717144] rfkill: input handler enabled
[   80.462376] rfkill: input handler disabled
[   80.468335] EXT4-fs (sdc1): mounted filesystem with ordered data mode. Quota
mode: none.
[   93.275986] input: Airdopes 121v2 (AVRCP) as /devices/virtual/input/input23
[  136.650027] usb 2-1.5: USB disconnect, device number 3
[  136.892439] usb 2-1.5: new full-speed USB device number 4 using ehci-pci
[  136.998154] usb 2-1.5: New USB device found, idVendor=0a12, idProduct=0001,
bcdDevice=88.91
[  136.998160] usb 2-1.5: New USB device strings: Mfr=0, Product=2,
SerialNumber=0
[  136.998162] usb 2-1.5: Product: BT DONGLE10
[  137.000158] Bluetooth: hci0: CSR: Setting up dongle with HCI ver=9 rev=0810;
LMP ver=9 subver=2312; manufacturer=10
[  137.000163] Bluetooth: hci0: CSR: Unbranded CSR clone detected; adding
workarounds...
[  137.000164] Bluetooth: hci0: CSR: Unbranded CSR clone detected;
force-suspending once...
[  137.000166] Bluetooth: hci0: CSR: Couldn't suspend the device for our Barrot
8041a02 receive-issue workaround
[  137.000188] Bluetooth: hci0: HCI Delete Stored Link Key command is
advertised, but not supported.
[  137.000189] Bluetooth: hci0: HCI Read Default Erroneous Data Reporting
command is advertised, but not supported.
[  137.000190] Bluetooth: hci0: HCI Set Event Filter command not supported.
[  137.082247] Bluetooth: MGMT ver 1.22
[  143.561978] usb 2-1.5: USB disconnect, device number 4

This seems to only happen when idle not when there is any activity. Maybe the
dongle has some built-in power saving feature that disables the dongle when not
in use? Please note this also happens after disabling the
HCI_QUIRK_NO_SUSPEND_NOTIFIER. These dongles seem really messed up.

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