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ACPICA: Fix mutex errors when running _REG methods 

Fixes a problem where mutex errors can occur when running a _REG
method that is in the same scope as a method-defined operation
region or an operation region under a module-level IF block.
This is rare, so the problem has not been seen before.
ACPICA BZ 826.

http://www.acpica.org/bugzilla/show_bug.cgi?id=826

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bob Moore 2009-12-11 15:16:38 +08:00 committed by Len Brown
parent 90434c1c7c
commit d976591120
1 changed files with 20 additions and 11 deletions
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31
drivers/acpi/acpica/dswload.c
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@ -1052,9 +1052,22 @@ acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
}
/*
* If we are executing a method, initialize the region
* The op_region is not fully parsed at this time. The only valid
* argument is the space_id. (We must save the address of the
* AML of the address and length operands)
*
* If we have a valid region, initialize it. The namespace is
* unlocked at this point.
*
* Need to unlock interpreter if it is locked (if we are running
* a control method), in order to allow _REG methods to be run
* during acpi_ev_initialize_region.
*/
if (walk_state->method_node) {
/*
* Executing a method: initialize the region and unlock
* the interpreter
*/
status =
acpi_ex_create_region(op->named.data,
op->named.length,
@ -1063,21 +1076,17 @@ acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
if (ACPI_FAILURE(status)) {
return (status);
}
acpi_ex_exit_interpreter();
}
/*
* The op_region is not fully parsed at this time. Only valid
* argument is the space_id. (We must save the address of the
* AML of the address and length operands)
*/
/*
* If we have a valid region, initialize it
* Namespace is NOT locked at this point.
*/
status =
acpi_ev_initialize_region
(acpi_ns_get_attached_object(node), FALSE);
if (walk_state->method_node) {
acpi_ex_enter_interpreter();
}
if (ACPI_FAILURE(status)) {
/*
* If AE_NOT_EXIST is returned, it is not fatal