Hello Marcel,
> Observed race condition during controller recovery mechanism resulting the controller not responding to the reset command.
>
> To avoid such race condition need a delay of 2ms soon after the USB re-enumeration and before sending the Reset command which shall allow controller to completely recover and process the Reset command.
>
> BUG=b:64035404
> TEST=Magic tethering, P0 and P1 santiy test cases, kernel-boot log
>
> Signed-off-by: Chethan T N <chethan.tumkur.narayan@xxxxxxxxx>
> Signed-off-by: Amit K Bag <amit.k.bag@xxxxxxxxx>
> ---
> drivers/bluetooth/btusb.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index f73a27ea28cc..c7fce9c11889 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -1743,6 +1743,15 @@ static int btusb_setup_intel(struct hci_dev *hdev)
>
> BT_DBG("%s", hdev->name);
>
> + /* Observed race condition during controller recovery mechanism
> + * resulting the controller not responding to the reset command.
> + *
> + * To avoid such race condition need a delay of 2ms soon after the
> + * USB re-enumeration and before sending the Reset command which shall
> + * allow controller to completely recover and process the Reset command.
> + */
> + mdelay(2);
> +
I will provide a new patch. Please ignore this patch.
Thanks & Regards,
Amit Bag
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