From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Date: Thu, 16 May 2013 11:48:49 +0000 (+0900)
Subject: tracing: Return -EBUSY when event_enable_func() fails to get module
X-Git-Tag: firefly_0821_release~3680^2~325^2~7
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=6ed0106667d76589cb648c27edb4f4ffbf9d59ca;p=firefly-linux-kernel-4.4.55.git

tracing: Return -EBUSY when event_enable_func() fails to get module

Since try_module_get() returns false( = 0) when it fails to
pindown a module, event_enable_func() returns 0 which means
"succeed". This can cause a kernel panic when the entry
is removed, because the event is already released.

This fixes the bug by returning -EBUSY, because the reason
why it fails is that the module is being removed at that time.

Link: http://lkml.kernel.org/r/20130516114848.13508.97899.stgit@mhiramat-M0-7522

Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Tom Zanussi <tom.zanussi@intel.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 7a0cf68027cc..27963e2bf4bf 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -2072,8 +2072,10 @@ event_enable_func(struct ftrace_hash *hash,
  out_reg:
 	/* Don't let event modules unload while probe registered */
 	ret = try_module_get(file->event_call->mod);
-	if (!ret)
+	if (!ret) {
+		ret = -EBUSY;
 		goto out_free;
+	}
 
 	ret = __ftrace_event_enable_disable(file, 1, 1);
 	if (ret < 0)