linux-kernel - Re: [PATCH 1/1] Bluetooth: Convert MSFT filter HCI cmd to hci

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Date:   Thu, 23 Feb 2023 17:07:29 -0800
From:   Luiz Augusto von Dentz <luiz.dentz@...il.com>
To:     "Gix, Brian" <brian.gix@...el.com>
Cc:     "mat.jonczyk@...pl" <mat.jonczyk@...pl>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
        "Von Dentz, Luiz" <luiz.von.dentz@...el.com>
Subject: Re: [PATCH 1/1] Bluetooth: Convert MSFT filter HCI cmd to hci_sync

Hi Brian,

On Thu, Feb 23, 2023 at 2:21 PM Gix, Brian <brian.gix@...el.com> wrote:
>
> Hi Luiz,
>
> Do you need the original patch re-generated, or can you find it in this
> thread?

Please resend it so CI can pick it up and ensures it still builds properly.

> On Fri, 2023-02-17 at 20:31 +0100, Mateusz Jończyk wrote:
> > W dniu 21.11.2022 o 19:48, Gix, Brian pisze:
> > > Hi Mateusz,
> > >
> > > On Sat, 2022-11-19 at 19:26 +0100, Mateusz Jończyk wrote:
> > > > W dniu 2.11.2022 o 18:59, Brian Gix pisze:
> > > > > The msft_set_filter_enable() command was using the deprecated
> > > > > hci_request mechanism rather than hci_sync. This caused the
> > > > > warning
> > > > > error:
> > > > > hci0: HCI_REQ-0xfcf0
> > > > >
> > > > > Signed-off-by: Brian Gix <brian.gix@...el.com>
> > > > > ---
> > > > >  net/bluetooth/msft.c | 36 +++++++++++-------------------------
> > > > >  1 file changed, 11 insertions(+), 25 deletions(-)
> > > >
> > > > Hello,
> > > >
> > > > On the first time I was testing this patch, I was heavily testing
> > > > various Bluetooth functionality. Eventually, something stopped
> > > > working
> > > > and I was no longer able to establish a Bluetooth connection
> > > > between
> > > > my mobile phone and my laptop. To try to resolve this issue, I
> > > > tried
> > > > suspending
> > > > my laptop, but after resume, I got a kernel panic (dmesg attached
> > > > below, I may
> > > > provide journal extracts on request).
> >
> > Hello,
> >
> > I have to apologize for the delay.
> >
> > This kernel panic happened to me again, without this patch so now I
> > can
> > say that it is unrelated. I have again tested the patch you provided
> > and
> > Bluetooth with it appeared to be working correctly. I have even
> > tested
> > with a mobile app called "Beacon Simulator" [1] and the beacon was
> > successfully found on my laptop.
> >
> > I have tested this on top of 6.2.0-rc8.
> >
> > Additionally, to see how it worked, I tested it with some debugging
> > printks and additional calls to
> >         msft_set_filter_enable(hdev, X);
> > (patch attached below) and the code appears to do as it is intended,
> > but
> > when I combined two
> >         msft_set_filter_enable(hdev, true);
> > calls one after the other, I got something like this:
> >
> >         Bluetooth: hci0: BEGIN msft_set_filter_enable(hdev, 1)
> >         Bluetooth: hci0: BEGIN
> > msft_le_set_advertisement_filter_enable_cb(hdev, user_data, 0)
> >         Bluetooth: hci0: END msft_set_filter_enable(hdev, 1), err = 0
> >         Bluetooth: hci0: BEGIN msft_set_filter_enable(hdev, 1)
> >         Bluetooth: hci0: Opcode 0xfcf0 failed: -16
> >         Bluetooth: hci0: BEGIN
> > msft_le_set_advertisement_filter_enable_cb(hdev, user_data, f0)
> >         Bluetooth: hci0: END msft_set_filter_enable(hdev, 1), err = -
> > 16
> >
> > instead of the error code 0x0C as is described in a comment in
> > msft_le_set_advertisement_filter_enable_cb() and the Microsoft
> > specification. Is this expected?
> >
> > In msft_set_filter_enable() your patch also casts err from int to u8
> > while calling msft_le_set_advertisement_filter_enable_cb() without
> > checking its sign.
> >
> > Greetings,
> >
> > Mateusz
> >
> > [1]
> > https://play.google.com/store/apps/details?id=net.alea.beaconsimulator
> >
> > Cc: Luiz Von Dentz <luiz.von.dentz@...el.com>
> >
> > ---
> >  net/bluetooth/msft.c | 13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> >
> > diff --git a/net/bluetooth/msft.c b/net/bluetooth/msft.c
> > index bf5cee48916c..a6f594bd0722 100644
> > --- a/net/bluetooth/msft.c
> > +++ b/net/bluetooth/msft.c
> > @@ -6,6 +6,7 @@
> >  #include <net/bluetooth/bluetooth.h>
> >  #include <net/bluetooth/hci_core.h>
> >  #include <net/bluetooth/mgmt.h>
> > +#include <linux/delay.h>
> >
> >  #include "hci_request.h"
> >  #include "mgmt_util.h"
> > @@ -527,6 +528,12 @@ void msft_do_open(struct hci_dev *hdev)
> >         if (msft_monitor_supported(hdev)) {
> >                 msft->resuming = true;
> >                 msft_set_filter_enable(hdev, true);
> > +               mdelay(1);
> > +               msft_set_filter_enable(hdev, false);
> > +               mdelay(1);
> > +               msft_set_filter_enable(hdev, true);
> > +               mdelay(1);
> > +               msft_set_filter_enable(hdev, true);
> >                 /* Monitors get removed on power off, so we need to
> > explicitly
> >                  * tell the controller to re-monitor.
> >                  */
> > @@ -749,6 +756,8 @@ static void
> > msft_le_set_advertisement_filter_enable_cb(struct hci_dev *hdev,
> >         struct msft_cp_le_set_advertisement_filter_enable *cp =
> > user_data;
> >         struct msft_data *msft = hdev->msft_data;
> >
> > +       bt_dev_warn(hdev, "BEGIN
> > msft_le_set_advertisement_filter_enable_cb(hdev, user_data, %x)",
> > (unsigned) status);
> > +
> >         /* Error 0x0C would be returned if the filter enabled status
> > is
> >          * already set to whatever we were trying to set.
> >          * Although the default state should be disabled, some
> > controller set
> > @@ -804,6 +813,8 @@ int msft_set_filter_enable(struct hci_dev *hdev,
> > bool enable)
> >         struct msft_data *msft = hdev->msft_data;
> >         int err;
> >
> > +       bt_dev_warn(hdev, "BEGIN msft_set_filter_enable(hdev, %d)",
> > (int) enable);
> > +
> >         if (!msft)
> >                 return -EOPNOTSUPP;
> >
> > @@ -814,6 +825,8 @@ int msft_set_filter_enable(struct hci_dev *hdev,
> > bool enable)
> >
> >         msft_le_set_advertisement_filter_enable_cb(hdev, &cp, err);
> >
> > +       bt_dev_warn(hdev, "END msft_set_filter_enable(hdev, %d), err
> > = %d", (int) enable, err);
> > +
> >         return 0;
> >  }
> >
>


-- 
Luiz Augusto von Dentz