3 files changed, 22 insertions, 1 deletions

diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 3a10ef5914eb..6cd5b6403a7b 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -210,7 +210,7 @@ struct acpi_device_power_state {
 struct acpi_device_power {
         int state;              /* Current state */
         struct acpi_device_power_flags flags;
-        struct acpi_device_power_state states[4];       /* Power states (D0-D3) */
+        struct acpi_device_power_state states[ACPI_D_STATE_COUNT];      /* Power states (D0-D3Cold) */
 };
 
 /* Performance Management */
diff --git a/include/acpi/acpiosxf.h b/include/acpi/acpiosxf.h
index a756bc8d866d..4543b6f75867 100644
--- a/include/acpi/acpiosxf.h
+++ b/include/acpi/acpiosxf.h
@@ -98,8 +98,11 @@ acpi_os_table_override(struct acpi_table_header *existing_table,
 /*
  * Spinlock primitives
  */
+
+#ifndef acpi_os_create_lock
 acpi_status
 acpi_os_create_lock(acpi_spinlock *out_handle);
+#endif
 
 void acpi_os_delete_lock(acpi_spinlock handle);
 
diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
index 5d2a5e9544d9..2ce1be9f6291 100644
--- a/include/acpi/platform/aclinux.h
+++ b/include/acpi/platform/aclinux.h
@@ -159,6 +159,24 @@ static inline void *acpi_os_acquire_object(acpi_cache_t * cache)
         } while (0)
 #endif
 
+/*
+ * When lockdep is enabled, the spin_lock_init() macro stringifies it's
+ * argument and uses that as a name for the lock in debugging.
+ * By executing spin_lock_init() in a macro the key changes from "lock" for
+ * all locks to the name of the argument of acpi_os_create_lock(), which
+ * prevents lockdep from reporting false positives for ACPICA locks.
+ */
+#define acpi_os_create_lock(__handle)                           \
+({                                                              \
+        spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock));        \
+                                                                \
+        if (lock) {                                             \
+                *(__handle) = lock;                             \
+                spin_lock_init(*(__handle));                    \
+        }                                                       \
+        lock ? AE_OK : AE_NO_MEMORY;                            \
+})
+
 #endif /* __KERNEL__ */
 
 #endif /* __ACLINUX_H__ */