tracing: fix event_subsystem ref counting

commit cb59974742aea24adf6637eb0c4b8e7b48bca6fb upstream.

Fix a bug introduced by e9dbfae5, which prevents event_subsystem from
ever being released.

Ref_count was added to keep track of subsystem users, not for counting
events.  Subsystem is created with ref_count = 1, so there is no need to
increment it for every event, we have nr_events for that.  Fix this by
touching ref_count only when we actually have a new user -
subsystem_open().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Link: http://lkml.kernel.org/r/1320052062-7846-1-git-send-email-idryomov@gmail.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 581876f9f3872e9103a0110893396652599a1d6a..c212a7f934ec4841d8c9887ecf93f6a0b7526b27 100644 (file)
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1078,7 +1078,6 @@ event_subsystem_dir(const char *name, struct dentry *d_events)
        /* First see if we did not already create this dir */
        list_for_each_entry(system, &event_subsystems, list) {
                if (strcmp(system->name, name) == 0) {
-                       __get_system(system);
                        system->nr_events++;
                        return system->entry;
                }