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Date:   Mon, 5 Oct 2020 14:19:32 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        Sathish Narsimman <sathish.narasimman@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "Bluetooth: Update resolving list when updating
 whitelist"

Hi Greg,

>>>>>>> This reverts commit 0eee35bdfa3b472cc986ecc6ad76293fdcda59e2 as it
>>>>>>> breaks all bluetooth connections on my machine.
>>>>>>> 
>>>>>>> Cc: Marcel Holtmann <marcel@...tmann.org>
>>>>>>> Cc: Sathish Narsimman <sathish.narasimman@...el.com>
>>>>>>> Fixes: 0eee35bdfa3b ("Bluetooth: Update resolving list when updating whitelist")
>>>>>>> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>>>>>>> ---
>>>>>>> net/bluetooth/hci_request.c | 41 ++-----------------------------------
>>>>>>> 1 file changed, 2 insertions(+), 39 deletions(-)
>>>>>>> 
>>>>>>> This has been bugging me for since 5.9-rc1, when all bluetooth devices
>>>>>>> stopped working on my desktop system.  I finally got the time to do
>>>>>>> bisection today, and it came down to this patch.  Reverting it on top of
>>>>>>> 5.9-rc7 restored bluetooth devices and now my input devices properly
>>>>>>> work.
>>>>>>> 
>>>>>>> As it's almost 5.9-final, any chance this can be merged now to fix the
>>>>>>> issue?
>>>>>> 
>>>>>> can you be specific what breaks since our guys and I also think the
>>>>>> ChromeOS guys have been testing these series of patches heavily.
>>>>> 
>>>>> My bluetooth trackball does not connect at all.  With this reverted, it
>>>>> all "just works".
>>>>> 
>>>>> Same I think for a Bluetooth headset, can check that again if you really
>>>>> need me to, but the trackball is reliable here.
>>>>> 
>>>>>> When you run btmon does it indicate any errors?
>>>>> 
>>>>> How do I run it and where are the errors displayed?
>>>> 
>>>> you can do btmon -w trace.log and just let it run like tcdpump.
>>> 
>>> Ok, attached.
>>> 
>>> The device is not connecting, and then I open the gnome bluetooth dialog
>>> and it scans for devices in the area, but does not connect to my
>>> existing devices at all.
>>> 
>>> Any ideas?
>> 
>> the trace file is from -rc7 or from -rc7 with this patch reverted?
>> 
>> I asked, because I see no hint that anything goes wrong. However I have a suspicion if you bisected it to this patch.
>> 
>> diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
>> index e0269192f2e5..94c0daa9f28d 100644
>> --- a/net/bluetooth/hci_request.c
>> +++ b/net/bluetooth/hci_request.c
>> @@ -732,7 +732,7 @@ static int add_to_white_list(struct hci_request *req,
>>                return -1;
>> 
>>        /* White list can not be used with RPAs */
>> -       if (!allow_rpa && !use_ll_privacy(hdev) &&
>> +       if (!allow_rpa &&
>>            hci_find_irk_by_addr(hdev, &params->addr, params->addr_type)) {
>>                return -1;
>>        }
>> @@ -812,7 +812,7 @@ static u8 update_white_list(struct hci_request *req)
>>                }
>> 
>>                /* White list can not be used with RPAs */
>> -               if (!allow_rpa && !use_ll_privacy(hdev) &&
>> +               if (!allow_rpa &&
>>                    hci_find_irk_by_addr(hdev, &b->bdaddr, b->bdaddr_type)) {
>>                        return 0x00;
>>                }
>> 
>> 
>> If you just do the above, does thing work for you again?
> 
> Corrupted white-space issues aside, yes, it works!

I just pasted it from a different terminal ;)

> I am running 5.9-rc8 with just this change on it and my tracball works
> just fine.
> 
>> My suspicion is that the use_ll_privacy check is the wrong one here. It only checks if hardware feature is available, not if it is also enabled.
> 
> How would one go about enabling such a hardware feature if they wanted
> to?  :)

I need to understand what is going wrong for you. I have a suspicion, but first I need to understand what kind of device you have. I hope the trace file is enough.

> Anyway, feel free to put:
> 
> Tested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> on the above patch and hopefully get it to Linus for 5.9-final.

Sadly, it is a poor hot-needle fix.

Regards

Marcel

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