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authorErik Schmauss <erik.schmauss@intel.com>2018-03-14 16:13:08 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-05-30 07:47:41 +0200
commit43f9785ba5eb5100f879cdcfd7bb5dccd6057d2d (patch)
tree96b56d26c25ff7d69382cb35dc3c313ddb1b2246
parent7afa3b1137f4043dc7773ce3b7c20f2b276be802 (diff)
ACPICA: Events: add a return on failure from acpi_hw_register_read
[ Upstream commit b4c0de312613ca676db5bd7e696a44b56795612a ] 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> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/acpi/acpica/evevent.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/acpi/acpica/evevent.c b/drivers/acpi/acpica/evevent.c
index c7bffff9ed32..f53568533671 100644
--- a/drivers/acpi/acpica/evevent.c
+++ b/drivers/acpi/acpica/evevent.c
@@ -204,6 +204,7 @@ 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);
@@ -211,8 +212,12 @@ 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",