From: Li Zefan <lizf@cn.fujitsu.com>
Date: Fri, 27 Mar 2009 02:20:24 +0000 (+0800)
Subject: blktrace: fix memory leak when freeing struct blk_io_trace
X-Git-Tag: v2.6.30-rc1~2^2~13^5~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ad5dd5493a55e462796e42e50a49e76df76fdb05;p=pandora-kernel.git

blktrace: fix memory leak when freeing struct blk_io_trace

Impact: fix mixed ioctl and ftrace-plugin blktrace use memory leak

When mixing the use of ioctl-based blktrace and ftrace-based blktrace,
we can leak memory in this way:

  # btrace /dev/sda > /dev/null &
  # echo 0 > /sys/block/sda/sda1/trace/enable

now we leak bt->dropped_file, bt->msg_file, bt->rchan...

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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