ACPI: EC: Use proper handle for boot EC

Fall back to ACPI_ROOT_HANDLE only in case of error.

ACPI: EC: EC description table is found, configuring boot EC
ACPI Error (evregion-0316): No handler for Region [ECOR] (ffff81007a651620) [EmbeddedControl] [20070126]
ACPI Error (exfldio-0289): Region EmbeddedControl(3) has no handler [20070126]

http://bugzilla.kernel.org/show_bug.cgi?id=9916

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 7222a18..caf873c 100644 (file)
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -943,7 +943,11 @@ int __init acpi_ec_ecdt_probe(void)
                boot_ec->command_addr = ecdt_ptr->control.address;
                boot_ec->data_addr = ecdt_ptr->data.address;
                boot_ec->gpe = ecdt_ptr->gpe;
-               boot_ec->handle = ACPI_ROOT_OBJECT;
+               if (ACPI_FAILURE(acpi_get_handle(NULL, ecdt_ptr->id,
+                               &boot_ec->handle))) {
+                       pr_info("Failed to locate handle for boot EC\n");
+                       boot_ec->handle = ACPI_ROOT_OBJECT;
+               }
        } else {
                /* This workaround is needed only on some broken machines,
                 * which require early EC, but fail to provide ECDT */