From 4e4a4d75700da67c1209c151d5f11a309c3b8367 Mon Sep 17 00:00:00 2001 From: Tom Zanussi Date: Mon, 23 Nov 2015 13:51:16 -0600 Subject: [PATCH] tracing: Update cond flag when enabling or disabling a trigger When a trigger is enabled, the cond flag should be set beforehand, otherwise a trigger that's expecting to process a trace record (e.g. one with post_trigger set) could be invoked without one. Likewise a trigger's cond flag should be reset after it's disabled, not before. Link: http://lkml.kernel.org/r/a420b52a67b1c2d3cab017914362d153255acb99.1448303214.git.tom.zanussi@linux.intel.com Signed-off-by: Tom Zanussi Signed-off-by: Daniel Wagner Reviewed-by: Masami Hiramatsu Reviewed-by: Namhyung Kim Tested-by: Masami Hiramatsu Signed-off-by: Steven Rostedt --- kernel/trace/trace_events_trigger.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c index 42a4009fd75a..4d2f3ccc56f6 100644 --- a/kernel/trace/trace_events_trigger.c +++ b/kernel/trace/trace_events_trigger.c @@ -543,11 +543,12 @@ static int register_trigger(char *glob, struct event_trigger_ops *ops, list_add_rcu(&data->list, &file->triggers); ret++; + update_cond_flag(file); if (trace_event_trigger_enable_disable(file, 1) < 0) { list_del_rcu(&data->list); + update_cond_flag(file); ret--; } - update_cond_flag(file); out: return ret; } @@ -575,8 +576,8 @@ static void unregister_trigger(char *glob, struct event_trigger_ops *ops, if (data->cmd_ops->trigger_type == test->cmd_ops->trigger_type) { unregistered = true; list_del_rcu(&data->list); - update_cond_flag(file); trace_event_trigger_enable_disable(file, 0); + update_cond_flag(file); break; } } @@ -1319,11 +1320,12 @@ static int event_enable_register_trigger(char *glob, list_add_rcu(&data->list, &file->triggers); ret++; + update_cond_flag(file); if (trace_event_trigger_enable_disable(file, 1) < 0) { list_del_rcu(&data->list); + update_cond_flag(file); ret--; } - update_cond_flag(file); out: return ret; } @@ -1344,8 +1346,8 @@ static void event_enable_unregister_trigger(char *glob, (enable_data->file == test_enable_data->file)) { unregistered = true; list_del_rcu(&data->list); - update_cond_flag(file); trace_event_trigger_enable_disable(file, 0); + update_cond_flag(file); break; } } -- 2.20.1