[ Greg asked me to submit a report to regressions@, so here it is. ]
The following error was observed on Chromebooks with MT8183 CPU
(ASUS Chromebook Detachable CM3, HP Chromebook 11a, and others):
[ 224.735198] Bluetooth: qca_setup() hci0: setting up ROME/QCA6390
[ 225.205024] Bluetooth: qca_read_soc_version() hci0: QCA Product ID :0x00000008
[ 225.205040] Bluetooth: qca_read_soc_version() hci0: QCA SOC Version :0x00000044
[ 225.205045] Bluetooth: qca_read_soc_version() hci0: QCA ROM Version :0x00000302
[ 225.205049] Bluetooth: qca_read_soc_version() hci0: QCA Patch Version:0x000003e8
[ 225.205055] Bluetooth: qca_uart_setup() hci0: QCA controller version 0x00440302
[ 225.205061] Bluetooth: qca_download_firmware() hci0: QCA Downloading qca/rampatch_00440302.bin
[ 227.252653] Bluetooth: hci_cmd_timeout() hci0: command 0xfc00 tx timeout
...
[ 223.604971] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
[ 223.605027] Bluetooth: qca_recv() hci0: Frame reassembly failed (-84)
(repeated several times)
...
The Bluetooth interface on those Chromebooks can not be enabled.
Bisect suggests that upstream commit 0ea9fd001a14 ("Bluetooth: Shutdown
controller after workqueues are flushed or cancelled") introduced the problem.
Reverting it fixes the problem.
The problem was also reported at [1] on a Mediatek Pumpkin board.
As of this writing, the problem is still present in the upstream kernel
as well as in all stable releases which include commit 0ea9fd001a14.
Thanks,
Guenter
---
[1] https://lkml.org/lkml/2021/7/28/569
