From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date: Thu, 27 Feb 2020 21:56:28 +0000 (+0100)
Subject: ACPI: EC: Drop AE_NOT_FOUND special case from ec_install_handlers()
X-Git-Tag: v5.7-rc1~186^2^2~6
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7247f0c24c17a46a9732a801e57b627fb6bbf294;p=thirdparty%2Flinux.git

ACPI: EC: Drop AE_NOT_FOUND special case from ec_install_handlers()

If the status value returned by acpi_install_address_space_handler()
in ec_install_handlers() is AE_NOT_FOUND, it is treated in a special
way, apparently because it might mean a _REG method evaluation
failure (at least that is the case according to the comment in
there), but acpi_install_address_space_handler() does not take
_REG evaluation errors into account at all, so the AE_NOT_FOUND
special handling is confusing at best.

For this reason, change ec_install_handlers() to stop the EC and
return -ENODEV on all acpi_install_address_space_handler() errors.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 3153e7684053e..6f501d552e6e7 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1489,19 +1489,8 @@ static int ec_install_handlers(struct acpi_ec *ec, struct acpi_device *device)
 							    &acpi_ec_space_handler,
 							    NULL, ec);
 		if (ACPI_FAILURE(status)) {
-			if (status == AE_NOT_FOUND) {
-				/*
-				 * Maybe OS fails in evaluating the _REG
-				 * object. The AE_NOT_FOUND error will be
-				 * ignored and OS * continue to initialize
-				 * EC.
-				 */
-				pr_err("Fail in evaluating the _REG object"
-					" of EC device. Broken bios is suspected.\n");
-			} else {
-				acpi_ec_stop(ec, false);
-				return -ENODEV;
-			}
+			acpi_ec_stop(ec, false);
+			return -ENODEV;
 		}
 		set_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags);
 	}