ACPI: EC: Enable boot EC before bus_scan

Some _STA methods called during bus_scan() might require EC region handler,
which might be enabled later in the scan.
Enable it explicitly before scan to avoid errors.

Reference: http://bugzilla.kernel.org/show_bug.cgi?id=9627

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 d411017..97dc161 100644 (file)
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -892,6 +892,17 @@ static int acpi_ec_stop(struct acpi_device *device, int type)
        return 0;
 }
 
+int __init acpi_boot_ec_enable(void)
+{
+       if (!boot_ec || boot_ec->handlers_installed)
+               return 0;
+       if (!ec_install_handlers(boot_ec)) {
+               first_ec = boot_ec;
+               return 0;
+       }
+       return -EFAULT;
+}
+
 int __init acpi_ec_ecdt_probe(void)
 {
        int ret;
@@ -924,9 +935,10 @@ int __init acpi_ec_ecdt_probe(void)
                        goto error;
                /* We really need to limit this workaround, the only ASUS,
                 * which needs it, has fake EC._INI method, so use it as flag.
+                * Keep boot_ec struct as it will be needed soon.
                 */
                if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x)))
-                       goto error;
+                       return -ENODEV;
        }
 
        ret = ec_install_handlers(boot_ec);

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 5b4d462..cbfe9ae 100644 (file)
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1449,6 +1449,8 @@ static int acpi_bus_scan_fixed(struct acpi_device *root)
        return result;
 }
 
+int __init acpi_boot_ec_enable(void);
+
 static int __init acpi_scan_init(void)
 {
        int result;
@@ -1480,6 +1482,10 @@ static int __init acpi_scan_init(void)
         * Enumerate devices in the ACPI namespace.
         */
        result = acpi_bus_scan_fixed(acpi_root);
+
+       /* EC region might be needed at bus_scan, so enable it now */
+       acpi_boot_ec_enable();
+
        if (!result)
                result = acpi_bus_scan(acpi_root, &ops);