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* [PATCH] tracing: fix event_subsystem ref counting
@ 2011-10-31  9:07 Ilya Dryomov
  2011-10-31 16:14 ` Steven Rostedt
                   ` (2 more replies)
  0 siblings, 3 replies; 6+ messages in thread
From: Ilya Dryomov @ 2011-10-31  9:07 UTC (permalink / raw)
  To: linux-kernel; +Cc: Steven Rostedt, idryomov

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>
---
 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;
 		}
-- 
1.7.6.3


^ permalink raw reply related	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2011-12-06  6:25 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-10-31  9:07 [PATCH] tracing: fix event_subsystem ref counting Ilya Dryomov
2011-10-31 16:14 ` Steven Rostedt
2011-11-01  1:12   ` Li Zefan
2011-11-01  1:38     ` Steven Rostedt
2011-11-18 23:04 ` [tip:perf/core] " tip-bot for Ilya Dryomov
2011-12-06  6:25 ` tip-bot for Ilya Dryomov

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