linux-kernel - [PATCH] tracing: Check return value of tracing_dentry

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Date:	Mon, 23 Apr 2012 10:11:57 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Namhyung Kim <namhyung@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] tracing: Check return value of tracing_dentry_percpu()

If tracing_dentry_percpu() failed, tracing_init_debugfs_percpu()
will try to create each cpu directories on debugfs' root directory
as d_percpu is NULL.

Signed-off-by: Namhyung Kim <namhyung.kim@....com>
---
 kernel/trace/trace.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ed7b5d1e12f4..54df9a672fd9 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4367,6 +4367,9 @@ static void tracing_init_debugfs_percpu(long cpu)
 	struct dentry *d_cpu;
 	char cpu_dir[30]; /* 30 characters should be more than enough */
 
+	if (!d_percpu)
+		return;
+
 	snprintf(cpu_dir, 30, "cpu%ld", cpu);
 	d_cpu = debugfs_create_dir(cpu_dir, d_percpu);
 	if (!d_cpu) {
-- 
1.7.10

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