From b4c0de312613ca676db5bd7e696a44b56795612a Mon Sep 17 00:00:00 2001
From: Erik Schmauss <erik.schmauss@intel.com>
Date: Wed, 14 Mar 2018 16:13:08 -0700
Subject: [PATCH] ACPICA: Events: add a return on failure from
 acpi_hw_register_read

This ensures that acpi_ev_fixed_event_detect() does not use fixed_status
and and fixed_enable as uninitialized variables.

Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/acpica/evevent.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/acpica/evevent.c b/drivers/acpi/acpica/evevent.c
index 36a243edc3b7..b3d07cc14d75 100644
--- a/drivers/acpi/acpica/evevent.c
+++ b/drivers/acpi/acpica/evevent.c
@@ -170,6 +170,7 @@ u32 acpi_ev_fixed_event_detect(void)
 	u32 fixed_status;
 	u32 fixed_enable;
 	u32 i;
+	acpi_status status;
 
 	ACPI_FUNCTION_NAME(ev_fixed_event_detect);
 
@@ -177,8 +178,12 @@ u32 acpi_ev_fixed_event_detect(void)
 	 * Read the fixed feature status and enable registers, as all the cases
 	 * depend on their values. Ignore errors here.
 	 */
-	(void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
-	(void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);
+	status = acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
+	status |=
+	    acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);
+	if (ACPI_FAILURE(status)) {
+		return (int_status);
+	}
 
 	ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
 			  "Fixed Event Block: Enable %08X Status %08X\n",
-- 
2.30.2