linux-kernel - [PATCH 05/13] ftrace: Call trace_parser

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Message-Id: <1260709694-5166-6-git-send-regression-fweisbec@gmail.com>
Date:	Sun, 13 Dec 2009 14:08:06 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Jason Baron <jbaron@...hat.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH 05/13] ftrace: Call trace_parser_clear() properly

From: Li Zefan <lizf@...fujitsu.com>

I found a weird behavior:

  # echo 'fuse:*' > set_ftrace_filter
  bash: echo: write error: Invalid argument
  # cat set_ftrace_filter
  fuse_dev_fasync
  fuse_dev_poll
  fuse_copy_do

We should call trace_parser_clear() no matter ftrace_process_regex()
returns 0 or -errno, otherwise we will actually take the unaccepted
records from ftrace_regex_release().

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
LKML-Reference: <4B1DC4D2.3000406@...fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 kernel/trace/ftrace.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 08a3fb5..ff8aecd 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2208,10 +2208,9 @@ ftrace_regex_write(struct file *file, const char __user *ubuf,
 	    !trace_parser_cont(parser)) {
 		ret = ftrace_process_regex(parser->buffer,
 					   parser->idx, enable);
+		trace_parser_clear(parser);
 		if (ret)
 			goto out_unlock;
-
-		trace_parser_clear(parser);
 	}
 
 	ret = read;
-- 
1.6.2.3

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