[PATCH v3 1/3] tracing/user_events: Fix incorrect return value for writing operation when events are disable

[sunliming]

The writing operation return the count of writes regardless of whether events
are enabled or disabled. Switch it to return 0 to indicates that the event
is disabled.

Signed-off-by: sunliming <sunliming@xxxxxxxxxx>
---
 kernel/trace/trace_events_user.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c
index 1ac5ba5685ed..c085ff829a58 100644
--- a/kernel/trace/trace_events_user.c
+++ b/kernel/trace/trace_events_user.c
@@ -1957,7 +1957,8 @@ static ssize_t user_events_write_core(struct file *file, struct iov_iter *i)
 
 		if (unlikely(faulted))
 			return -EFAULT;
-	}
+	} else
+		return 0;
 
 	return ret;
 }
-- 
2.25.1