ACPI / bus: Make ACPI_HANDLE() work for non-GPL code again
authorJohn Hubbard <jhubbard@nvidia.com>
Sat, 16 Sep 2017 00:35:27 +0000 (17:35 -0700)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Tue, 19 Sep 2017 20:42:31 +0000 (22:42 +0200)
commit9e987b70ada27554c5d176421de1d167218c49b5
tree1eb0e06e7c6f443ee1826554876ddc70c5b44f47
parent2bd6bf03f4c1c59381d62c61d03f6cc3fe71f66e
ACPI / bus: Make ACPI_HANDLE() work for non-GPL code again

Due to commit db3e50f3234b (device property: Get rid of struct
fwnode_handle type field), ACPI_HANDLE() inadvertently became
a GPL-only call. The call path that led to that was:

ACPI_HANDLE()
    ACPI_COMPANION()
        to_acpi_device_node()
            is_acpi_device_node()
                acpi_device_fwnode_ops
                    DECLARE_ACPI_FWNODE_OPS(acpi_device_fwnode_ops);

...and the new DECLARE_ACPI_FWNODE_OPS() includes
EXPORT_SYMBOL_GPL, whereas previously it was a static struct.

In order to avoid changing any of that, let's instead provide ever
so slightly better encapsulation of those struct fwnode_operations
instances. Those do not really need to be directly used in
inline function calls in header files. Simply moving two small
functions (is_acpi_device_node and is_acpi_data_node) out of
acpi_bus.h, and into a .c file, does that.

That leaves the internals of struct fwnode_operations as GPL-only
(which I think was the intent all along), but un-breaks any driver
code out there that relies on the ACPI subsystem's being (historically)
an EXPORT_SYMBOL-usable system. By that, I mean, ACPI_HANDLE() and
other basic ACPI calls were non-GPL-protected.

Also, while I'm there, remove a tiny bit of redundancy that was missed
in the earlier commit, by having is_acpi_node() use the other two
routines, instead of checking fwnode directly.

Fixes: db3e50f3234b (device property: Get rid of struct fwnode_handle type field)
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
drivers/acpi/property.c
include/acpi/acpi_bus.h