[for-linus][PATCH 1/3] tracing/user_events: Fix incorrect return value for writing operation when events are disabled

Steven Rostedt
2023-06-23T01:33:53Z

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.

Link: https://lore.kernel.org/linux-trace-kernel/20230621060827.151564-2-sunliming@kylinos.cn

Signed-off-by: sunliming <sunliming@kylinos.cn>
Acked-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
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 8df0550415e7..902cae005df4 100644
--- a/kernel/trace/trace_events_user.c
+++ b/kernel/trace/trace_events_user.c
@@ -2096,7 +2096,8 @@ static ssize_t user_events_write_core(struct file *file, struct iov_iter *i)

if (unlikely(faulted))
return -EFAULT;
- }
+ } else
+ return 0;

return ret;
}
--
2.39.2