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    SubjectRe: [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@verizon.com wrote:
    > From: Johan Hovold <johan@kernel.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

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