Re: [4.15 stable regression] "Bluetooth: btusb: Fix quirk for Atheros 1525/QCA6174" breaks bluetooth on some devices

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Wed, Apr 25, 2018 at 02:40:37PM +0200, Hans de Goede wrote:
> Hi,
> 
> On 18-04-18 15:18, Hans de Goede wrote:
> > Hi Takashi, Marcel,
> > 
> > It seems that this commit:
> > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-4.15.y&id=7ec32f585fefd7c154453aa29ccf8fa2a11cc865
> > 
> > Is breaking bluetooth on some devices, see:
> > 
> > https://bugzilla.redhat.com/show_bug.cgi?id=1568911
> > 
> > The problem is the following error now being thrown:
> > 
> > [   28.466248] Bluetooth: hci0: don't support firmware rome 0x1020200
> > 
> > Looking at the code I wonder if maybe we need to mask the ver_rom
> > with & 0xfff when comparing it to the qca_devices_table[i].rom_version
> > filed ?
> > 
> > Or maybe the commit is actually wrong, or maybe devices with the
> > 0cf3:3004 USB id need either the BTUSB_QCA_ROM or BTUSB_ATH3012
> > quirk depending on the device and we need to probe this somehow?
> 
> I've been receiving more complaints from users about this on
> various devices, so I think that the 7ec32f585fefd7c154453aa29ccf8fa2a11cc865
> commit should be reverted from 4.15.x while we figure this out.
> 
> Does anyone have any idea how we cam distinguish between the 2
> different versions which seem to be hiding between the same USB-id ?

4.15.y is end-of-life, so there is no more releases being made for it,
sorry.

But, this commit is in 4.4.y, 4.9.y, 4.14.y, and 4.16.  Can you revert
it in Linus's tree and I can revert it everywhere else as well?

thanks,

greg k-h