[PATCH 05/42] ACPICA: Fix SyncLevel support interaction with method auto-serialization
From: Lv Zheng
Date: Tue Dec 29 2015 - 00:54:08 EST
From: "David E. Box" <david.e.box@xxxxxxxxxxxxxxx>
ACPICA commit 253e3c03efc1a495d2aa61eee09ab1d0842a3dce
The control method auto-serialization can interfere with existing
ASL code that makes use of Mutex/Method SyncLevel support. This
change makes the auto-serialization transparent to the SyncLevel
support and management. David Box.
Link: https://github.com/acpica/acpica/commit/253e3c03
Signed-off-by: David E. Box <david.e.box@xxxxxxxxxxxxxxx>
Signed-off-by: Bob Moore <robert.moore@xxxxxxxxx>
Signed-off-by: Lv Zheng <lv.zheng@xxxxxxxxx>
---
drivers/acpi/acpica/dsmethod.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/acpica/dsmethod.c b/drivers/acpi/acpica/dsmethod.c
index bc32f31..49ba082 100644
--- a/drivers/acpi/acpica/dsmethod.c
+++ b/drivers/acpi/acpica/dsmethod.c
@@ -411,8 +411,19 @@ acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node,
obj_desc->method.mutex->mutex.thread_id =
walk_state->thread->thread_id;
- walk_state->thread->current_sync_level =
- obj_desc->method.sync_level;
+
+ /*
+ * Update the current sync_level only if this is not an auto-
+ * serialized method. In the auto case, we have to ignore
+ * the sync level for the method mutex (created for the
+ * auto-serialization) because we have no idea of what the
+ * sync level should be. Therefore, just ignore it.
+ */
+ if (!(obj_desc->method.info_flags &
+ ACPI_METHOD_IGNORE_SYNC_LEVEL)) {
+ walk_state->thread->current_sync_level =
+ obj_desc->method.sync_level;
+ }
} else {
obj_desc->method.mutex->mutex.
original_sync_level =
--
1.7.10
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