4.4-stable review patch. If anyone has any objections, please let me know.
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From: Erik Schmauss erik.schmauss@intel.com
[ 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 --- drivers/acpi/acpica/evevent.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
--- 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",