From: Steven Rostedt (Red Hat) <rostedt@goodmis.org>
Date: Tue, 3 Feb 2015 16:56:20 +0000 (-0500)
Subject: tracing: Only create tracer options files if directory exists
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0f67f04ffcb592d065a20862a82d4539e0f8e909;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

tracing: Only create tracer options files if directory exists

Do not bother creating tracer options if no tracing directory
exists. If a tracer is enabled via the command line, and is
started before the tracing directory is created, then it wont have
its tracer specific options created.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 38c613ede10d..d4627f15407a 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4172,8 +4172,11 @@ static int tracing_set_tracer(struct trace_array *tr, const char *buf)
 		free_snapshot(tr);
 	}
 #endif
-	/* Currently, only the top instance has options */
-	if (tr->flags & TRACE_ARRAY_FL_GLOBAL) {
+	/*
+	 * Only enable if the directory has been created already.
+	 * Currently, only the top instance has options
+	 */
+	if (tr->dir && tr->flags & TRACE_ARRAY_FL_GLOBAL) {
 		destroy_trace_option_files(topts);
 		topts = create_trace_option_files(tr, t);
 	}