[PATCH] tracing: fix event system memory leak

[Li Zefan]

system->ref_count = system->nr_events + ref_count for opening "enable"
and "filter"

so when removing a module, it's wrong to drop ref_count only when nr_events
drops to 0.

Cc: stable <stable@xxxxxxxxxx>
Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
---
 kernel/trace/trace_events.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 581876f..281a60a 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1252,8 +1252,8 @@ static void remove_subsystem_dir(const char *name)
 			if (!--system->nr_events) {
 				debugfs_remove_recursive(system->entry);
 				list_del(&system->list);
-				__put_system(system);
 			}
+			__put_system(system);
 			break;
 		}
 	}
-- 
1.7.3.1
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