diff options
Diffstat (limited to 'drivers/acpi/events/evmisc.c')
| -rw-r--r-- | drivers/acpi/events/evmisc.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/acpi/events/evmisc.c b/drivers/acpi/events/evmisc.c index 2d34663dc1e..d075062f5b8 100644 --- a/drivers/acpi/events/evmisc.c +++ b/drivers/acpi/events/evmisc.c @@ -461,6 +461,19 @@ acpi_status acpi_ev_acquire_global_lock(u16 timeout) acpi_ev_global_lock_acquired++; /* + * Update the global lock handle and check for wraparound. The handle is + * only used for the external global lock interfaces, but it is updated + * here to properly handle the case where a single thread may acquire the + * lock via both the AML and the acpi_acquire_global_lock interfaces. The + * handle is therefore updated on the first acquire from a given thread + * regardless of where the acquisition request originated. + */ + acpi_gbl_global_lock_handle++; + if (acpi_gbl_global_lock_handle == 0) { + acpi_gbl_global_lock_handle = 1; + } + + /* * Make sure that a global lock actually exists. If not, just treat * the lock as a standard mutex. */ |