[PATCH] tracing: Check return value of tracing_dentry_percpu()

From: Namhyung Kim
Date: Sun Apr 22 2012 - 21:12:40 EST


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@xxxxxxx>
---
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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