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DateMon, 27 Feb 2006 14:32:26 -0800
FromChris Wright <>
Subject[patch 26/39] [PATCH] dm: free minor after unlink gendisk
-stable review patch.  If anyone has any objections, please let us know.
------------------
Minor number should be freed after del_gendisk(). Otherwise, there could
be a window where 2 registered gendisk has same minor number.

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Acked-by: Alasdair G Kergon <agk@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
[chrisw: backport to 2.6.15]
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
drivers/md/dm.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletion(-)
--- linux-2.6.15.4.orig/drivers/md/dm.c
+++ linux-2.6.15.4/drivers/md/dm.c
@@ -812,14 +812,16 @@ static struct mapped_device *alloc_dev(u

static void free_dev(struct mapped_device *md)
{
+ unsigned int minor = md->disk->first_minor;
+
if (md->frozen_bdev) {
thaw_bdev(md->frozen_bdev, NULL);
bdput(md->frozen_bdev);
}
- free_minor(md->disk->first_minor);
mempool_destroy(md->tio_pool);
mempool_destroy(md->io_pool);
del_gendisk(md->disk);
+ free_minor(minor);
put_disk(md->disk);
blk_put_queue(md->queue);
kfree(md);
--
-
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