From: Tejun Heo <tj@kernel.org>
Date: Sat, 13 Nov 2010 10:55:16 +0000 (+0100)
Subject: mtd: fix bdev exclusive open bugs in block2mtd::add_device()
X-Git-Tag: v2.6.38-rc1~231^2~20^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=731edacb7567c15f25b1fccac18a203bd432ae5e;p=pandora-kernel.git

mtd: fix bdev exclusive open bugs in block2mtd::add_device()

There are two bdev exclusive open bugs.

* open_bdev_exclusive() must not be called with NULL holder.  Use dev
  as the holder.

* open_by_devnum() doesn't open the bdev exclusively but
  block2mtd_free_device() always assumes it.  Explicitly claim the
  bdev.

The latter is rather clumsy but will be simplified with future
blkdev_get/put() cleanups.

- Updated to use local variable @mode to cache FMODE_* masks as
  suggested by Artem Bityutskiy.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: linux-mtd@lists.infradead.org
Cc: Artem Bityutskiy <dedekind1@gmail.com>
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