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tracing: Check state.disabled in synth event trace functions

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Since trace_state.disabled is set in __synth_event_trace_start() at
the same time -ENOENT is returned, don't bother returning -ENOENT -
just have callers check trace_state.disabled instead, and avoid the
extra return val munging.

Link: http://lkml.kernel.org/r/87315c3889af870e8370e82b76cf48b426d70130.1585941485.git.zanussi@kernel.org

Suggested-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@godmis.org>
This commit is contained in:
Tom Zanussi 2020-04-03 14:31:19 -05:00 committed by Steven Rostedt (VMware)
parent fc9d276f22
commit 1b94b3aed3
1 changed files with 3 additions and 16 deletions
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19
kernel/trace/trace_events_hist.c
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@ -1845,7 +1845,6 @@ __synth_event_trace_start(struct trace_event_file *file,
if (!(file->flags & EVENT_FILE_FL_ENABLED) ||
trace_trigger_soft_disabled(file)) {
trace_state->disabled = true;
ret = -ENOENT;
goto out;
}
@ -1907,11 +1906,8 @@ int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...)
int ret;
ret = __synth_event_trace_start(file, &state);
if (ret) {
if (ret == -ENOENT)
ret = 0; /* just disabled, not really an error */
if (ret || state.disabled)
return ret;
}
if (n_vals != state.event->n_fields) {
ret = -EINVAL;
@ -1987,11 +1983,8 @@ int synth_event_trace_array(struct trace_event_file *file, u64 *vals,
int ret;
ret = __synth_event_trace_start(file, &state);
if (ret) {
if (ret == -ENOENT)
ret = 0; /* just disabled, not really an error */
if (ret || state.disabled)
return ret;
}
if (n_vals != state.event->n_fields) {
ret = -EINVAL;
@ -2067,16 +2060,10 @@ EXPORT_SYMBOL_GPL(synth_event_trace_array);
int synth_event_trace_start(struct trace_event_file *file,
struct synth_event_trace_state *trace_state)
{
int ret;
if (!trace_state)
return -EINVAL;
ret = __synth_event_trace_start(file, trace_state);
if (ret == -ENOENT)
ret = 0; /* just disabled, not really an error */
return ret;
return __synth_event_trace_start(file, trace_state);
}
EXPORT_SYMBOL_GPL(synth_event_trace_start);