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

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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>
This commit is contained in:
Rafael J. Wysocki 2020-03-02 11:25:21 +01:00
parent e3cfabcd73
commit 3d9b8dd832
1 changed files with 2 additions and 1 deletions
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3
drivers/acpi/ec.c
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@ -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_name(device), ACPI_EC_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_EC_CLASS); 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. */ /* Fast path: this device corresponds to the boot EC. */
ec = boot_ec; ec = boot_ec;
} else { } else {