linux-kernel - [PATCH 2/2] tracing: Fix error handling to ensure instances can always be removed

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Message-Id: <1373502874-1706-2-git-send-email-azl@google.com>
Date:	Wed, 10 Jul 2013 17:34:34 -0700
From:	Alexander Z Lam <azl@...gle.com>
To:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org
Cc:	Alexander Z Lam <azl@...gle.com>, David Sharp <dhsharp@...gle.com>,
	Vaibhav Nagarnaik <vnagarnaik@...gle.com>,
	Alexander Z Lam <lambchop468@...il.com>
Subject: [PATCH 2/2] tracing: Fix error handling to ensure instances can always be removed

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.

Cc: Vaibhav Nagarnaik <vnagarnaik@...gle.com>
Cc: David Sharp <dhsharp@...gle.com>
Cc: Alexander Z Lam <lambchop468@...il.com>
Signed-off-by: Alexander Z Lam <azl@...gle.com>
---
 kernel/trace/trace.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ca2743b..4ea9967 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5985,8 +5985,10 @@ static int new_instance_create(const char *name)
 		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);
 
-- 
1.8.3

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