tracing: Don't return -EINVAL when tracing soft disabled synth events

There's no reason to return -EINVAL when tracing a synthetic event if
it's soft disabled - treat it the same as if it were hard disabled and
return normally.

Have synth_event_trace() and synth_event_trace_array() just return
normally, and have synth_event_trace_start set the trace state to
disabled and return.

Link: http://lkml.kernel.org/r/df5d02a1625aff97c9866506c5bada6a069982ba.1581374549.git.zanussi@kernel.org
Fixes: 8dcc53ad956d2 ("tracing: Add synth_event_trace() and related functions")
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index a546ffa..99a0216 100644 (file)
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1828,7 +1828,8 @@ int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...)
         * called directly by the user, we don't have that but we
         * still need to honor not logging when disabled.
         */
-       if (!(file->flags & EVENT_FILE_FL_ENABLED))
+       if (!(file->flags & EVENT_FILE_FL_ENABLED) ||
+           trace_trigger_soft_disabled(file))
                return 0;
 
        event = file->event_call->data;
@@ -1836,9 +1837,6 @@ int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...)
        if (n_vals != event->n_fields)
                return -EINVAL;
 
-       if (trace_trigger_soft_disabled(file))
-               return -EINVAL;
-
        fields_size = event->n_u64 * sizeof(u64);
 
        /*
@@ -1918,7 +1916,8 @@ int synth_event_trace_array(struct trace_event_file *file, u64 *vals,
         * called directly by the user, we don't have that but we
         * still need to honor not logging when disabled.
         */
-       if (!(file->flags & EVENT_FILE_FL_ENABLED))
+       if (!(file->flags & EVENT_FILE_FL_ENABLED) ||
+           trace_trigger_soft_disabled(file))
                return 0;
 
        event = file->event_call->data;
@@ -1926,9 +1925,6 @@ int synth_event_trace_array(struct trace_event_file *file, u64 *vals,
        if (n_vals != event->n_fields)
                return -EINVAL;
 
-       if (trace_trigger_soft_disabled(file))
-               return -EINVAL;
-
        fields_size = event->n_u64 * sizeof(u64);
 
        /*
@@ -2017,7 +2013,8 @@ int synth_event_trace_start(struct trace_event_file *file,
         * trace case, we save the enabed state upon start and just
         * ignore the following data calls.
         */
-       if (!(file->flags & EVENT_FILE_FL_ENABLED)) {
+       if (!(file->flags & EVENT_FILE_FL_ENABLED) ||
+           trace_trigger_soft_disabled(file)) {
                trace_state->enabled = false;
                goto out;
        }
@@ -2026,11 +2023,6 @@ int synth_event_trace_start(struct trace_event_file *file,
 
        trace_state->event = file->event_call->data;
 
-       if (trace_trigger_soft_disabled(file)) {
-               ret = -EINVAL;
-               goto out;
-       }
-
        fields_size = trace_state->event->n_u64 * sizeof(u64);
 
        /*