Commit 3d9b8dd8 authored Mar 02, 2020 by Rafael J. Wysocki

ACPI: EC: Use fast path in acpi_ec_add() for DSDT boot EC



If the boot EC comes from the DSDT, its ACPI handle is equal to the
handle of a device object with the PNP0C09 device ID.  If that
device object is passed to acpi_ec_add(), it is not necessary to
allocate a new EC structure for it and parse it, because that has
been done already, so change the function to use the fast path in
that case.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent e3cfabcd

drivers/acpi/ec.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -1611,7 +1611,8 @@ static int acpi_ec_add(struct acpi_device *device)
		strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
		strcpy(acpi_device_class(device), ACPI_EC_CLASS);

		if (!strcmp(acpi_device_hid(device), ACPI_ECDT_HID)) {
		if ((boot_ec && boot_ec->handle == device->handle) \|\|
		!strcmp(acpi_device_hid(device), ACPI_ECDT_HID)) {
		/* Fast path: this device corresponds to the boot EC. */
		ec = boot_ec;
		} else {

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