tracing/filters: return proper error code when writing filter file
- propagate return value of filter_add_pred() to the user
- return -ENOSPC but not -ENOMEM or -EINVAL when the filter array
is full
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <49E04CF0.3010105@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 054bc18..576f4fa 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -521,9 +521,10 @@
return cnt;
}
- if (filter_add_pred(call, pred)) {
+ err = filter_add_pred(call, pred);
+ if (err < 0) {
filter_free_pred(pred);
- return -EINVAL;
+ return err;
}
*ppos += cnt;
@@ -588,10 +589,11 @@
return cnt;
}
- if (filter_add_subsystem_pred(system, pred)) {
+ err = filter_add_subsystem_pred(system, pred);
+ if (err < 0) {
filter_free_subsystem_preds(system);
filter_free_pred(pred);
- return -EINVAL;
+ return err;
}
*ppos += cnt;
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 49b3ef5..e03cbf1 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -215,7 +215,7 @@
}
}
- return -ENOMEM;
+ return -ENOSPC;
}
static int is_string_field(const char *type)
@@ -319,7 +319,7 @@
}
if (i == MAX_FILTER_PRED)
- return -EINVAL;
+ return -ENOSPC;
events_for_each(call) {
int err;
