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From:   Max Chou <max.chou@realtek.com>
To:     "Kirill A. Shutemov" <kirill@shutemov.name>
CC:     Bagas Sanjaya <bagasdotme@gmail.com>,
        Hilda Wu <hildawu@realtek.com>,
        "alex_lu@realsil.com.cn" <alex_lu@realsil.com.cn>,
        Luiz Augusto von Dentz <luiz.von.dentz@intel.com>,
        Marcel Holtmann <marcel@holtmann.org>,
        "Johan Hedberg" <johan.hedberg@gmail.com>,
        Juerg Haefliger <juerg.haefliger@canonical.com>,
        Linux Bluetooth <linux-bluetooth@vger.kernel.org>,
        Thorsten Leemhuis <linux@leemhuis.info>,
        Linux Regressions <regressions@lists.linux.dev>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: RE: Regression: devcoredump patch broke Realtek usb bluetooth adapter
Thread-Topic: Regression: devcoredump patch broke Realtek usb bluetooth
 adapter
Thread-Index: AQHZ9iZZqIk9cnxrEkOIPrwHFnXgfLA4N/0AgAA1ZDCAABycgIAAkrXQgAAclfD//8ULgIAC/Ddg
Date:   Fri, 6 Oct 2023 01:22:28 +0000
Message-ID: <732012844f544d0daf790434025c8fb3@realtek.com>
References: <20231003182038.k57nirtt4sonvt7c@box.shutemov.name>
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Hi! 
Realtek will send a patch to fix this issue.

BRs,
Max


> -----Original Message-----
> From: Kirill A. Shutemov <kirill@shutemov.name>
> Sent: Wednesday, October 4, 2023 7:46 PM
> To: Max Chou <max.chou@realtek.com>
> Cc: Bagas Sanjaya <bagasdotme@gmail.com>; Hilda Wu
> <hildawu@realtek.com>; alex_lu@realsil.com.cn; Luiz Augusto von Dentz
> <luiz.von.dentz@intel.com>; Marcel Holtmann <marcel@holtmann.org>;
> Johan Hedberg <johan.hedberg@gmail.com>; Juerg Haefliger
> <juerg.haefliger@canonical.com>; Linux Bluetooth
> <linux-bluetooth@vger.kernel.org>; Thorsten Leemhuis <linux@leemhuis.info>;
> Linux Regressions <regressions@lists.linux.dev>; Linux Kernel Mailing List
> <linux-kernel@vger.kernel.org>
> Subject: Re: Regression: devcoredump patch broke Realtek usb bluetooth
> adapter
> 
> 
> External mail.
> 
> 
> 
> On Wed, Oct 04, 2023 at 07:28:45AM +0000, Max Chou wrote:
> > Hi! Kirill,
> > I guess the root cause is as below.
> > ===
> > static int btrtl_register_devcoredump_support(struct hci_dev *hdev) {
> >         int err;
> >
> >         err = hci_devcd_register(hdev, btrtl_coredump, btrtl_dmp_hdr,
> > NULL);
> >
> >         return err;
> > }
> > ===
> > If CONFIG_DEV_COREDUMP is not enabled, it would return -EOPNOTSUPP
> for hci_devcd_register().
> > Unfortunately, btrtl_register_devcoredump_support() will return it.
> > Finally, -EOPNOSTUPP will be returned for btrtl_setup_realtek().
> >
> > Could you have the following workaround for the root cause checked?
> > Please share dmesg as well. Thanks,
> 
> Yes. It works and I see
> 
> [    3.640539] Bluetooth: hci0: RTL: btrtl_register_devcoredump_support():
> err = -95
> 
> in dmesg. -EOPNOTSUPP indeed.
> 
> --
>   Kiryl Shutsemau / Kirill A. Shutemov