ring-buffer: Fix return value check in test_ringbuffer()

In case of error, the function kthread_run() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check
should be replaced with IS_ERR().

Link: http://lkml.kernel.org/r/1466184839-14927-1-git-send-email-weiyj_lk@163.com

Cc: stable@vger.kernel.org
Fixes: 6c43e554a ("ring-buffer: Add ring buffer startup selftest")
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 96fc3c043ad6..54e7a90db848 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -4826,9 +4826,9 @@ static __init int test_ringbuffer(void)
                 rb_data[cpu].cnt = cpu;
                 rb_threads[cpu] = kthread_create(rb_test, &rb_data[cpu],
                                                  "rbtester/%d", cpu);
-                if (WARN_ON(!rb_threads[cpu])) {
+                if (WARN_ON(IS_ERR(rb_threads[cpu]))) {
                         pr_cont("FAILED\n");
-                        ret = -1;
+                        ret = PTR_ERR(rb_threads[cpu]);
                         goto out_free;
                 }
 
@@ -4838,9 +4838,9 @@ static __init int test_ringbuffer(void)
 
         /* Now create the rb hammer! */
         rb_hammer = kthread_run(rb_hammer_test, NULL, "rbhammer");
-        if (WARN_ON(!rb_hammer)) {
+        if (WARN_ON(IS_ERR(rb_hammer))) {
                 pr_cont("FAILED\n");
-                ret = -1;
+                ret = PTR_ERR(rb_hammer);
                 goto out_free;
         }