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From: Li Zefan <lizf@cn.fujitsu.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
	Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH 2/3] ftrace: Call trace_parser_clear() properly
Date: Wed, 04 Nov 2009 13:15:27 +0800	[thread overview]
Message-ID: <4AF10DEF.6070605@cn.fujitsu.com> (raw)
In-Reply-To: <4AF10DD9.4020902@cn.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.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.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 c7fe869..b1acfb1 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;
-- 
1.6.3

  reply	other threads:[~2009-11-04  5:16 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-11-04  5:15 [PATCH 1/3] ftrace: Return EINVAL when writing invalid val to set_ftrace_filter Li Zefan
2009-11-04  5:15 ` Li Zefan [this message]
2009-11-04  5:15 ` [PATCH 3/3] function-graph: Allow writing the same val to set_graph_function Li Zefan

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