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authorLi Zefan <lizf@cn.fujitsu.com>2009-11-03 08:55:38 +0800
committerSteven Rostedt <rostedt@goodmis.org>2009-11-04 01:42:10 -0500
commited146b25942b428f8e8056587b7638ce76573c2f (patch)
tree36b3355b5d53057accb92000ee5b3986d5a05a8b /kernel/trace
parentf7112949f6a4cd6883d66c882d568c2197321de6 (diff)
ftrace: Fix unmatched locking in ftrace_regex_write()
When a command is passed to the set_ftrace_filter, then the ftrace_regex_lock is still held going back to user space. # echo 'do_open : foo' > set_ftrace_filter (still holding ftrace_regex_lock when returning to user space!) Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4AEF7F8A.3080300@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/ftrace.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 9c451a1930b6..6dc4e5ef7a01 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2222,15 +2222,15 @@ ftrace_regex_write(struct file *file, const char __user *ubuf,
ret = ftrace_process_regex(parser->buffer,
parser->idx, enable);
if (ret)
- goto out;
+ goto out_unlock;
trace_parser_clear(parser);
}
ret = read;
-
+out_unlock:
mutex_unlock(&ftrace_regex_lock);
-out:
+
return ret;
}