linux-kernel - [ 18/99] tracing: Fix error handling to ensure instances can always be removed

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Date:	Fri,  2 Aug 2013 18:07:31 +0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Alexander Z Lam <azl@...gle.com>,
	Vaibhav Nagarnaik <vnagarnaik@...gle.com>,
	David Sharp <dhsharp@...gle.com>,
	Alexander Z Lam <lambchop468@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: [ 18/99] tracing: Fix error handling to ensure instances can always be removed

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexander Z Lam <azl@...gle.com>

commit 609e85a70bcd0eedf4ec60639dbcfb1ab011e054 upstream.

Remove debugfs directories for tracing instances during creation if an error
occurs causing the trace_array for that instance to not be added to
ftrace_trace_arrays. If the directory continues to exist after the error, it
cannot be removed because the respective trace_array is not in
ftrace_trace_arrays.

Link: http://lkml.kernel.org/r/1373502874-1706-2-git-send-email-azl@google.com

Signed-off-by: Alexander Z Lam <azl@...gle.com>
Cc: Vaibhav Nagarnaik <vnagarnaik@...gle.com>
Cc: David Sharp <dhsharp@...gle.com>
Cc: Alexander Z Lam <lambchop468@...il.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/trace/trace.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5926,8 +5926,10 @@ static int new_instance_create(const cha
 		goto out_free_tr;
 
 	ret = event_trace_add_tracer(tr->dir, tr);
-	if (ret)
+	if (ret) {
+		debugfs_remove_recursive(tr->dir);
 		goto out_free_tr;
+	}
 
 	init_tracer_debugfs(tr, tr->dir);
 


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