linux-kernel - [for-next][PATCH 03/15] tracing: Have event_enable

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Message-ID: <20241226143935.156854562@goodmis.org>
Date: Thu, 26 Dec 2024 09:39:17 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Peter Zijlstra <peterz@...radead.org>
Subject: [for-next][PATCH 03/15] tracing: Have event_enable_write() just return error on error

From: Steven Rostedt <rostedt@...dmis.org>

The event_enable_write() function is inconsistent in how it returns
errors. Sometimes it updates the ppos parameter and sometimes it doesn't.
Simplify the code to just return an error or the count if there isn't an
error.

Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: https://lore.kernel.org/20241219201345.025284170@goodmis.org
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace_events.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 1545cc8b49d0..f4eff49faef6 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1549,18 +1549,18 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
 	switch (val) {
 	case 0:
 	case 1:
-		ret = -ENODEV;
 		mutex_lock(&event_mutex);
 		file = event_file_file(filp);
 		if (likely(file)) {
 			ret = tracing_update_buffers(file->tr);
-			if (ret < 0) {
-				mutex_unlock(&event_mutex);
-				return ret;
-			}
-			ret = ftrace_event_enable_disable(file, val);
+			if (ret >= 0)
+				ret = ftrace_event_enable_disable(file, val);
+		} else {
+			ret = -ENODEV;
 		}
 		mutex_unlock(&event_mutex);
+		if (ret < 0)
+			return ret;
 		break;
 
 	default:
@@ -1569,7 +1569,7 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
 
 	*ppos += cnt;
 
-	return ret ? ret : cnt;
+	return cnt;
 }
 
 static ssize_t
-- 
2.45.2