From d97659112044c0c77b93c6199eee7ee884eb3cca Mon Sep 17 00:00:00 2001 From: Bob Moore Date: Fri, 11 Dec 2009 15:16:38 +0800 Subject: [PATCH] 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 Signed-off-by: Lin Ming Signed-off-by: Len Brown --- drivers/acpi/acpica/dswload.c | 31 ++++++++++++++++++++----------- 1 file changed, 20 insertions(+), 11 deletions(-) diff --git a/drivers/acpi/acpica/dswload.c b/drivers/acpi/acpica/dswload.c index 9cc2289f872e..b40513dd6a6a 100644 --- a/drivers/acpi/acpica/dswload.c +++ b/drivers/acpi/acpica/dswload.c @@ -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