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Groups > linux.kernel > #1186098

[PATCH v9 01/22] tracing: Update cond flag when enabling or disabling a trigger

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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.

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Daniel Wagner <daniel.wagner@bmw-carit.de>
---
 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 42a4009..4d2f3cc 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;
 		}
 	}
-- 
1.9.3

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[PATCH v9 00/22] tracing: 'hist' triggers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 19:30 +0200
  [PATCH v9 09/22] tracing: Add hist trigger support for multiple values ('vals=' param) Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 19:30 +0200
  [PATCH v9 01/22] tracing: Update cond flag when enabling or disabling a trigger Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 19:30 +0200
  [PATCH v9 15/22] tracing: Add hist trigger 'sym' and 'sym-offset' modifiers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 19:30 +0200
  [PATCH v9 16/22] tracing: Add hist trigger 'execname' modifier Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 19:30 +0200
  [PATCH v9 11/22] tracing: Add hist trigger support for user-defined sorting ('sort=' param) Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 19:30 +0200
  [PATCH v9 12/22] tracing: Add hist trigger support for pausing and continuing a trace Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 19:30 +0200
    Re: [PATCH v9 12/22] tracing: Add hist trigger support for pausing  and continuing a trace Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> - 2015-07-22 10:30 +0200
  [PATCH v9 08/22] tracing: Add 'hist' event trigger command Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 19:30 +0200
    Re: [PATCH v9 08/22] tracing: Add 'hist' event trigger command Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> - 2015-07-20 15:40 +0200
  [PATCH v9 14/22] tracing: Add hist trigger 'hex' modifier for displaying numeric fields Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 19:30 +0200
  [PATCH v9 17/22] tracing: Add hist trigger 'syscall' modifier Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 19:30 +0200
  [PATCH v9 04/22] tracing: Add event record param to trigger_ops.func() Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 19:30 +0200
  [PATCH v9 05/22] tracing: Add get_syscall_name() Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 19:30 +0200
  Re: [PATCH v9 07/22] tracing: Add lock-free tracing_map Peter Zijlstra <peterz@infradead.org> - 2015-07-16 20:00 +0200
    Re: [PATCH v9 07/22] tracing: Add lock-free tracing_map Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 23:50 +0200
      Re: [PATCH v9 07/22] tracing: Add lock-free tracing_map Peter Zijlstra <peterz@infradead.org> - 2015-07-17 00:40 +0200
        Re: [PATCH v9 07/22] tracing: Add lock-free tracing_map Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-17 04:00 +0200
  Re: [PATCH v9 07/22] tracing: Add lock-free tracing_map Peter Zijlstra <peterz@infradead.org> - 2015-07-16 20:10 +0200
    Re: [PATCH v9 07/22] tracing: Add lock-free tracing_map Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-07-16 23:40 +0200

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