linux-kernel - Re: [PATCH AUTOSEL for 4.14 19/60] Bluetooth: avoid silent hci

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Date:   Wed, 13 Dec 2017 09:14:29 +0100
From:   Johan Hovold <johan@...nel.org>
To:     alexander.levin@...izon.com
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Johan Hovold <johan@...nel.org>,
        Marcel Holtmann <marcel@...tmann.org>
Subject: Re: [PATCH AUTOSEL for 4.14 19/60] Bluetooth: avoid silent hci_bcm
 ACPI PM regression

On Wed, Dec 13, 2017 at 01:55:14AM +0000, alexander.levin@...izon.com wrote:
> From: Johan Hovold <johan@...nel.org>
> 
> [ Upstream commit 4294625e029028854596865be401b9c5c1f906ef ]
> 
> The hci_bcm platform-device hack which was used to implement
> power management for ACPI devices is being replaced by a
> serial-device-bus implementation.
> 
> Unfortunately, when the corresponding change to the ACPI code lands (a
> change that will stop enumerating and registering the serial-device-node
> child as a platform device) PM will break silently unless serdev
> TTY-port controller support has been enabled. Specifically, hciattach
> (btattach) would still succeed, but power management would no longer
> work.

This one is not needed in stable, which does not have the above
mentioned ACPI change [ e361d1f85855 ("ACPI / scan: Fix enumeration for
special UART devices") ].

The Fixes and stable-CC tags were left out on purpose.

Johan