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

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Date:   Wed, 28 Jun 2023 08:54:49 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Beau Belgrave <beaub@...ux.microsoft.com>,
        sunliming <sunliming@...inos.cn>
Subject: [for-linus][PATCH 1/3] tracing/user_events: Fix incorrect return value for writing operation
 when events are disabled

From: sunliming <sunliming@...inos.cn>

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

Link: https://lkml.kernel.org/r/20230626111344.19136-2-sunliming@kylinos.cn

Acked-by: Beau Belgrave <beaub@...ux.microsoft.com>
Signed-off-by: sunliming <sunliming@...inos.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.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..09f7d9167b8e 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 -EBADF;
 
 	return ret;
 }
-- 
2.39.2