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    Subject[tip:perf/core] tracing: fix event_subsystem ref counting
    Commit-ID:  d631097577f6fe027f4903f62eabced6445d19bf
    Gitweb: http://git.kernel.org/tip/d631097577f6fe027f4903f62eabced6445d19bf
    Author: Ilya Dryomov <idryomov@gmail.com>
    AuthorDate: Mon, 31 Oct 2011 11:07:42 +0200
    Committer: Steven Rostedt <rostedt@goodmis.org>
    CommitDate: Mon, 31 Oct 2011 13:59:23 -0400

    tracing: fix event_subsystem ref counting

    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().

    Cc: stable@vger.kernel.org
    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>
    ---
    kernel/trace/trace_events.c | 1 -
    1 files changed, 0 insertions(+), 1 deletions(-)

    diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
    index 581876f..c212a7f 100644
    --- 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;
    }

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