From: David E. Box Date: Tue, 29 Dec 2015 05:53:57 +0000 (+0800) Subject: ACPICA: Fix SyncLevel support interaction with method auto-serialization X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=33d3a2abbd7afd51d8dcf1e35756e13e6b89f2cb;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git ACPICA: Fix SyncLevel support interaction with method auto-serialization 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 Signed-off-by: Bob Moore Signed-off-by: Lv Zheng Signed-off-by: Rafael J. Wysocki --- diff --git a/drivers/acpi/acpica/dsmethod.c b/drivers/acpi/acpica/dsmethod.c index bc32f3194afe..49ba082ad379 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 =