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| /openbmc/linux/net/bluetooth/ |
| H A D | hci_sync.c | diff 385315decf65902768a0062b4e594f59f013025e Mon Nov 15 16:00:52 CST 2021 Jesse Melhuish <melhuishj@chromium.org> Bluetooth: Don't initialize msft/aosp when using user channel
A race condition is triggered when usermode control is given to
userspace before the kernel's MSFT query responds, resulting in an
unexpected response to userspace's reset command.
Issue can be observed in btmon:
< HCI Command: Vendor (0x3f|0x001e) plen 2 #3 [hci0]
05 01 ..
@ USER Open: bt_stack_manage (privileged) version 2.22 {0x0002} [hci0]
< HCI Command: Reset (0x03|0x0003) plen 0 #4 [hci0]
> HCI Event: Command Complete (0x0e) plen 5 #5 [hci0]
Vendor (0x3f|0x001e) ncmd 1
Status: Command Disallowed (0x0c)
05 .
> HCI Event: Command Complete (0x0e) plen 4 #6 [hci0]
Reset (0x03|0x0003) ncmd 2
Status: Success (0x00)
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Reviewed-by: Sonny Sasaka <sonnysasaka@chromium.org>
Signed-off-by: Jesse Melhuish <melhuishj@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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