linux-kernel - [PATCH 3/3] tracing: Check cpu file on tracing

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Date:	Wed, 10 Apr 2013 09:18:13 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>
Subject: [PATCH 3/3] tracing: Check cpu file on tracing_release()

From: Namhyung Kim <namhyung.kim@....com>

It looks like tracing_release() lacks checking iter->cpu_file so that
closing a per_cpu trace file would attempt to close all cpu buffers.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 kernel/trace/trace.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 7270460cfe3c..0beddcb80509 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2883,7 +2883,13 @@ static int tracing_release(struct inode *inode, struct file *file)
 	WARN_ON(!tr->ref);
 	tr->ref--;
 
-	for_each_tracing_cpu(cpu) {
+	if (iter->cpu_file == RING_BUFFER_ALL_CPUS) {
+		for_each_tracing_cpu(cpu) {
+			if (iter->buffer_iter[cpu])
+				ring_buffer_read_finish(iter->buffer_iter[cpu]);
+		}
+	} else {
+		cpu = iter->cpu_file;
 		if (iter->buffer_iter[cpu])
 			ring_buffer_read_finish(iter->buffer_iter[cpu]);
 	}
-- 
1.7.11.7

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