From: Alexey Starikovskiy <astarikovskiy@xxxxxxx> 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@xxxxxxx> Signed-off-by: Len Brown <len.brown@xxxxxxxxx> --- drivers/acpi/ec.c | 14 +++++++++++++- drivers/acpi/scan.c | 6 ++++++ 2 files changed, 19 insertions(+), 1 deletions(-) diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index d411017..97dc161 100644 --- 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 --- 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); -- 1.5.4.rc2.84.gf85fd - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
