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ACPI: EC: Fix up fast path check in acpi_ec_add()

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The fast path check in acpi_ec_add() is not incorrect, because in
fact acpi_device_hid(device) can be equal to ACPI_ECDT_HID only if
boot_ec is not NULL, but it may confuse static checkers, so change
it to explicitly check boot_ec upfront and use the slow path if
that pointer is NULL.

Link: https://lore.kernel.org/linux-acpi/20200406144217.GA68494@mwanda/
Fixes: 3d9b8dd832 ("ACPI: EC: Use fast path in acpi_ec_add() for DSDT boot EC")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2020-04-06 17:40:27 +02:00
parent 2ce94bc4e0
commit d7e0481c0d
1 changed files with 2 additions and 2 deletions
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4
drivers/acpi/ec.c
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@ -1589,8 +1589,8 @@ 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 ((boot_ec && boot_ec->handle == device->handle) ||
!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 {