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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>
hifive-unleashed-5.1
Wei Yongjun 2016-06-17 17:33:59 +00:00 committed by Steven Rostedt (VMware)
parent a71c9a1c77
commit 62277de758
1 changed files with 4 additions and 4 deletions
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8
kernel/trace/ring_buffer.c
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@ -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;
}