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tracing: fix event_subsystem ref counting

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commit cb59974742 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>
This commit is contained in:
Ilya Dryomov 2011-10-31 11:07:42 +02:00 committed by Greg Kroah-Hartman
parent 4ebbdc2c9a
commit eda31b190f
1 changed files with 0 additions and 1 deletions
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kernel/trace/trace_events.c
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@ -1096,7 +1096,6 @@ 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;
}