From 989a0a3d248192b6f5d16cc2aea95faed89bb7ce Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (Red Hat)" Date: Mon, 28 Nov 2016 13:54:57 -0500 Subject: [PATCH] tracing: Have system enable return error if one of the events fail If one of the events within a system fails to enable when "1" is written to the system "enable" file, it should return an error. Note, some events may still be enabled, but the user should know that something did go wrong. Signed-off-by: Steven Rostedt --- kernel/trace/trace_events.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index d35fc2b0d304..93116549a284 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -702,6 +702,7 @@ __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, struct trace_event_call *call; const char *name; int ret = -EINVAL; + int eret = 0; list_for_each_entry(file, &tr->events, list) { @@ -725,9 +726,17 @@ __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, if (event && strcmp(event, name) != 0) continue; - ftrace_event_enable_disable(file, set); + ret = ftrace_event_enable_disable(file, set); - ret = 0; + /* + * Save the first error and return that. Some events + * may still have been enabled, but let the user + * know that something went wrong. + */ + if (ret && !eret) + eret = ret; + + ret = eret; } return ret;