From: Alexey Starikovskiy Date: Thu, 15 Nov 2007 18:52:47 +0000 (+0300) Subject: ACPI: EC: Don't init EC early if it has no _INI X-Git-Tag: v2.6.24-rc4~107^2~8^2 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5870a8cd23181703cc76f88f630372f8602c7648;p=linux-2.6 ACPI: EC: Don't init EC early if it has no _INI Option to init EC early inserted to handle #8598 ASUS problem, introduced several others. EC driver in this particular case has fake _INI method, not present on other machines, which don't need or break from this workaround, so lets use its presence as a flag for early init. http://bugzilla.kernel.org/show_bug.cgi?id=9262 http://bugzilla.kernel.org/show_bug.cgi?id=8598 https://bugzilla.novell.com/show_bug.cgi?id=334806 Signed-off-by: Alexey Starikovskiy Signed-off-by: Len Brown --- diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 06b78e5e33..56afe13af5 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -881,12 +881,20 @@ int __init acpi_ec_ecdt_probe(void) boot_ec->gpe = ecdt_ptr->gpe; 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 */ + acpi_handle x; printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, boot_ec, NULL); /* Check that acpi_get_devices actually find something */ if (ACPI_FAILURE(status) || !boot_ec->handle) 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. + */ + if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x))) + goto error; } ret = ec_install_handlers(boot_ec);