diff options
| author | Erik Schmauss <erik.schmauss@intel.com> | 2018-03-14 16:13:08 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-30 07:50:44 +0200 |
| commit | 1e45b8dfb148997c2725f00e87ef8fa393320f5b (patch) | |
| tree | 1b5bf4ed234f9f3fdbcbe8bd391fae0ba3cd70a6 /drivers/acpi | |
| parent | fe45138dd010dd479716c669660f8bdc8125ded5 (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>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/acpica/evevent.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/acpi/acpica/evevent.c b/drivers/acpi/acpica/evevent.c index 80fc0b9b11e5..f362841881e6 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", |