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tracing/user_events: Fix incorrect return value for writing operation when events are disabled

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commit f6d026eea390d59787a6cdc2ef5c983d02e029d0 upstream.

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

Cc: stable@vger.kernel.org
7f5a08c79d ("user_events: Add minimal support for trace_event into ftrace")
Acked-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: sunliming <sunliming@kylinos.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
sunliming 2023-06-26 19:13:42 +08:00 committed by Greg Kroah-Hartman
parent a4336343ea
commit 5aea2ac374
1 changed files with 2 additions and 1 deletions
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3
kernel/trace/trace_events_user.c
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@ -1456,7 +1456,8 @@ static ssize_t user_events_write_core(struct file *file, struct iov_iter *i)
if (unlikely(faulted))
return -EFAULT;
}
} else
return -EBADF;
return ret;
}