diff options
| author | Lv Zheng <lv.zheng@intel.com> | 2014-12-02 03:56:55 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-12-03 02:29:59 +0300 |
| commit | 7dd882195695871d6da046de036214d32f09e2ea (patch) | |
| tree | 9fa9019f85181538070a7f5fd24cb4ba0b9714a8 /drivers/acpi/acpica/evgpe.c | |
| parent | c50f13c672df758b59e026c15b9118f3ed46edc4 (diff) | |
| download | linux-7dd882195695871d6da046de036214d32f09e2ea.tar.xz | |
ACPICA: Events: Always modify GPE registers under the GPE lock
It is reported that there are pieces of code invoking acpi_ev_finish_gpe()
without holding acpi_gbl_gpe_lock. Since this function will modify GPE
register values, there could be races breaking the register modification
process.
This patch fixes this issue. Lv Zheng.
Reported-by: Joe Liu <joe.liu@apple.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/evgpe.c')
| -rw-r--r-- | drivers/acpi/acpica/evgpe.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/evgpe.c b/drivers/acpi/acpica/evgpe.c index 81db932b15ee..aa70154cf4fa 100644 --- a/drivers/acpi/acpica/evgpe.c +++ b/drivers/acpi/acpica/evgpe.c @@ -616,8 +616,11 @@ static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context) static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context) { struct acpi_gpe_event_info *gpe_event_info = context; + acpi_cpu_flags flags; + flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); (void)acpi_ev_finish_gpe(gpe_event_info); + acpi_os_release_lock(acpi_gbl_gpe_lock, flags); ACPI_FREE(gpe_event_info); return; |