tracing: Use free_trace_buffer() in allocate_trace_buffers()

In allocate_trace_buffers(), if allocating tr->max_buffer
fails, we can directly call free_trace_buffer to free
tr->array_buffer.

Link: https://lkml.kernel.org/r/65f0702d-07f6-08de-2a07-4c50af56a67b@huawei.com

Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Author: ZhiqiangLiu26

kernel/trace/trace.c

@@ -9101,6 +9101,16 @@ allocate_trace_buffer(struct trace_array *tr, struct array_buffer *buf, int size
 	return 0;
 }
 
+static void free_trace_buffer(struct array_buffer *buf)
+{
+	if (buf->buffer) {
+		ring_buffer_free(buf->buffer);
+		buf->buffer = NULL;
+		free_percpu(buf->data);
+		buf->data = NULL;
+	}
+}
+
 static int allocate_trace_buffers(struct trace_array *tr, int size)
 {
 	int ret;
@@ -9113,10 +9123,7 @@ static int allocate_trace_buffers(struct trace_array *tr, int size)
 	ret = allocate_trace_buffer(tr, &tr->max_buffer,
 				    allocate_snapshot ? size : 1);
 	if (MEM_FAIL(ret, "Failed to allocate trace buffer\n")) {
-		ring_buffer_free(tr->array_buffer.buffer);
-		tr->array_buffer.buffer = NULL;
-		free_percpu(tr->array_buffer.data);
-		tr->array_buffer.data = NULL;
+		free_trace_buffer(&tr->array_buffer);
 		return -ENOMEM;
 	}
 	tr->allocated_snapshot = allocate_snapshot;
@@ -9131,16 +9138,6 @@ static int allocate_trace_buffers(struct trace_array *tr, int size)
 	return 0;
 }
 
-static void free_trace_buffer(struct array_buffer *buf)
-{
-	if (buf->buffer) {
-		ring_buffer_free(buf->buffer);
-		buf->buffer = NULL;
-		free_percpu(buf->data);
-		buf->data = NULL;
-	}
-}
-
 static void free_trace_buffers(struct trace_array *tr)
 {
 	if (!tr)