From 672af843abfc9a41c7ec792722e04b6c68a3cfea Mon Sep 17 00:00:00 2001
From: Bob Moore <robert.moore@intel.com>
Date: Wed, 12 Jan 2011 09:13:31 +0800
Subject: [PATCH] ACPICA: Debugger: Lock namespace for duration of a namespace
dump
Prevents issues if the namespace is changing underneath the
debugger. Especially temporary nodes, since the debugger displays
these also.
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Reviewed-by: Rafael Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
---
drivers/acpi/acpica/nsdump.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/acpi/acpica/nsdump.c b/drivers/acpi/acpica/nsdump.c
index a54dc39e304..82693c3eb25 100644
--- a/drivers/acpi/acpica/nsdump.c
+++ b/drivers/acpi/acpica/nsdump.c
@@ -624,9 +624,22 @@ acpi_ns_dump_objects(acpi_object_type type,
acpi_owner_id owner_id, acpi_handle start_handle)
{
struct acpi_walk_info info;
+ acpi_status status;
ACPI_FUNCTION_ENTRY();
+ /*
+ * Just lock the entire namespace for the duration of the dump.
+ * We don't want any changes to the namespace during this time,
+ * especially the temporary nodes since we are going to display
+ * them also.
+ */
+ status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
+ if (ACPI_FAILURE(status)) {
+ acpi_os_printf("Could not acquire namespace mutex\n");
+ return;
+ }
+
info.debug_level = ACPI_LV_TABLES;
info.owner_id = owner_id;
info.display_type = display_type;
@@ -636,6 +649,8 @@ acpi_ns_dump_objects(acpi_object_type type,
ACPI_NS_WALK_TEMP_NODES,
acpi_ns_dump_one_object, NULL,
(void *)&info, NULL);
+
+ (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
}
#endif /* ACPI_FUTURE_USAGE */
--
2.20.1