ACPI: EC: Don't init EC early if it has no _INI (5870a8cd) · Commits · 戴 / test

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:

drivers/acpi/ec.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -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);