3.16.84-rc1 review patch. If anyone has any objections, please let me know.
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From: "Steven Rostedt (VMware)" rostedt@goodmis.org
commit dfb6cd1e654315168e36d947471bd2a0ccd834ae upstream.
Looking through old emails in my INBOX, I came across a patch from Luis Henriques that attempted to fix a race of two stat tracers registering the same stat trace (extremely unlikely, as this is done in the kernel, and probably doesn't even exist). The submitted patch wasn't quite right as it needed to deal with clean up a bit better (if two stat tracers were the same, it would have the same files).
But to make the code cleaner, all we needed to do is to keep the all_stat_sessions_mutex held for most of the registering function.
Link: http://lkml.kernel.org/r/1410299375-20068-1-git-send-email-luis.henriques@ca...
Fixes: 002bb86d8d42f ("tracing/ftrace: separate events tracing and stats tracing engine") Reported-by: Luis Henriques luis.henriques@canonical.com Signed-off-by: Steven Rostedt (VMware) rostedt@goodmis.org Signed-off-by: Ben Hutchings ben@decadent.org.uk --- kernel/trace/trace_stat.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-)
--- a/kernel/trace/trace_stat.c +++ b/kernel/trace/trace_stat.c @@ -302,7 +302,7 @@ static int init_stat_file(struct stat_se int register_stat_tracer(struct tracer_stat *trace) { struct stat_session *session, *node; - int ret; + int ret = -EINVAL;
if (!trace) return -EINVAL; @@ -313,17 +313,15 @@ int register_stat_tracer(struct tracer_s /* Already registered? */ mutex_lock(&all_stat_sessions_mutex); list_for_each_entry(node, &all_stat_sessions, session_list) { - if (node->ts == trace) { - mutex_unlock(&all_stat_sessions_mutex); - return -EINVAL; - } + if (node->ts == trace) + goto out; } - mutex_unlock(&all_stat_sessions_mutex);
+ ret = -ENOMEM; /* Init the session */ session = kzalloc(sizeof(*session), GFP_KERNEL); if (!session) - return -ENOMEM; + goto out;
session->ts = trace; INIT_LIST_HEAD(&session->session_list); @@ -332,15 +330,16 @@ int register_stat_tracer(struct tracer_s ret = init_stat_file(session); if (ret) { destroy_session(session); - return ret; + goto out; }
+ ret = 0; /* Register */ - mutex_lock(&all_stat_sessions_mutex); list_add_tail(&session->session_list, &all_stat_sessions); + out: mutex_unlock(&all_stat_sessions_mutex);
- return 0; + return ret; }
void unregister_stat_tracer(struct tracer_stat *trace)