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authorLv Zheng <zetalog@gmail.com>2016-10-26 15:40:12 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-10-29 01:57:43 +0200
commit25ccd2429fd0af5b9c2c136c8c593491aeabf162 (patch)
tree6e42efd5429fddba4bdaf301708c7e2b9870e8f6 /drivers/acpi
parent07d9a380680d1c0eb51ef87ff2eab5c994949e69 (diff)
downloadop-kernel-dev-25ccd2429fd0af5b9c2c136c8c593491aeabf162.zip
op-kernel-dev-25ccd2429fd0af5b9c2c136c8c593491aeabf162.tar.gz
ACPICA: Dispatcher: Fix order issue of method termination
The last step of the method termination should be the end of the method serialization. Otherwise, the steps happening after it will face the race issues that cannot be protected by the method serialization mechanism. This patch fixes this issue by moving the per-method-object deletion code prior than the end of the method serialization. Otherwise, the possible race issues may result in AE_ALREADY_EXISTS error in a parallel environment. Fixes: 74f51b80a0c4 (ACPICA: Namespace: Fix dynamic table loading issues) Reported-and-tested-by: Imre Deak <imre.deak@intel.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')
-rw-r--r--drivers/acpi/acpica/dsmethod.c40
1 files changed, 20 insertions, 20 deletions
diff --git a/drivers/acpi/acpica/dsmethod.c b/drivers/acpi/acpica/dsmethod.c
index 32e9ddc..c4028a8 100644
--- a/drivers/acpi/acpica/dsmethod.c
+++ b/drivers/acpi/acpica/dsmethod.c
@@ -731,26 +731,6 @@ acpi_ds_terminate_control_method(union acpi_operand_object *method_desc,
acpi_ds_method_data_delete_all(walk_state);
/*
- * If method is serialized, release the mutex and restore the
- * current sync level for this thread
- */
- if (method_desc->method.mutex) {
-
- /* Acquisition Depth handles recursive calls */
-
- method_desc->method.mutex->mutex.acquisition_depth--;
- if (!method_desc->method.mutex->mutex.acquisition_depth) {
- walk_state->thread->current_sync_level =
- method_desc->method.mutex->mutex.
- original_sync_level;
-
- acpi_os_release_mutex(method_desc->method.
- mutex->mutex.os_mutex);
- method_desc->method.mutex->mutex.thread_id = 0;
- }
- }
-
- /*
* Delete any namespace objects created anywhere within the
* namespace by the execution of this method. Unless:
* 1) This method is a module-level executable code method, in which
@@ -786,6 +766,26 @@ acpi_ds_terminate_control_method(union acpi_operand_object *method_desc,
~ACPI_METHOD_MODIFIED_NAMESPACE;
}
}
+
+ /*
+ * If method is serialized, release the mutex and restore the
+ * current sync level for this thread
+ */
+ if (method_desc->method.mutex) {
+
+ /* Acquisition Depth handles recursive calls */
+
+ method_desc->method.mutex->mutex.acquisition_depth--;
+ if (!method_desc->method.mutex->mutex.acquisition_depth) {
+ walk_state->thread->current_sync_level =
+ method_desc->method.mutex->mutex.
+ original_sync_level;
+
+ acpi_os_release_mutex(method_desc->method.
+ mutex->mutex.os_mutex);
+ method_desc->method.mutex->mutex.thread_id = 0;
+ }
+ }
}
/* Decrement the thread count on the method */
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