Hi Larry,
>>> Suspend could fail for some platforms because
>>> btusb_suspend==> btusb_stop_traffic ==> usb_kill_anchored_urbs,
>>>
>>> When btusb_bulk_complete returns before system suspend and resubmits an urb,
>>> the system cannot enter suspend state.
>>>
>>> Signed-off-by: Champion Chen <champion_chen@xxxxxxxxxxxxxx>
>>> Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
>>> Cc: Stable <stable@xxxxxxxxxxxxxxx>
>>> ---
>>> Johan,
>>>
>>> To help Champion with the process, I have formatted the patch in
>>> the correct manner. I hope I understand the issue correctly and
>>> stated it in a coherent manner in the commit message.
>>>
>>> Larry
>>> ---
>>> drivers/bluetooth/btusb.c | 9 +++++++++
>>> 1 file changed, 9 insertions(+)
>>>
>>> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
>>> index 292c38e..45a7211 100644
>>> --- a/drivers/bluetooth/btusb.c
>>> +++ b/drivers/bluetooth/btusb.c
>>> @@ -330,6 +330,9 @@ static void btusb_intr_complete(struct urb *urb)
>>> BT_ERR("%s corrupted event packet", hdev->name);
>>> hdev->stat.err_rx++;
>>> }
>>> + } else if (urb->status == -ENOENT) {
>>> + /* Avoid suspend failed when usb_kill_urb */
>>> + return;
>>> }
>>>
>>> if (!test_bit(BTUSB_INTR_RUNNING, &data->flags))
>>> @@ -417,6 +420,9 @@ static void btusb_bulk_complete(struct urb *urb)
>>> urb->actual_length) < 0) {
>>> BT_ERR("%s corrupted ACL packet", hdev->name);
>>> hdev->stat.err_rx++;
>>> + } else if (urb->status == -ENOENT) {
>>> + /* Avoid suspend failed when usb_kill_urb */
>>> + return;
>>> }
>>
>> this one is utterly bogus. Either urb->status is 0 or it is -ENOENT, but it will not be both. I think you put it to the wrong if clause.
>
> Thanks for the review. Obviously, you are correct. A revised patch will be sent soon.
one other thing. Please let maintainers decide when a patch is useful for stable and when not. Patches need to go upstream first anyway. People spamming stable@xxxxxxxxxxxxxxx with patches that are not reviewed yet is pretty much a waste of time.
Regards
Marcel
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