linux-kernel - [PATCH v4 1/3] tracing/user_events: Fix incorrect return value for writing operation when events are disabled

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Message-Id: <20230626111344.19136-2-sunliming@kylinos.cn>
Date:   Mon, 26 Jun 2023 19:13:42 +0800
From:   sunliming <sunliming@...inos.cn>
To:     rostedt@...dmis.org, beaub@...ux.microsoft.com, mhiramat@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        sunliming <sunliming@...inos.cn>
Subject: [PATCH v4 1/3] tracing/user_events: Fix incorrect return value for writing operation when events are disabled

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.

Signed-off-by: sunliming <sunliming@...inos.cn>
---
 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..146bb2e9758f 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 -EBADF;
 
 	return ret;
 }
-- 
2.25.1