[PATCH] dm: free minor after unlink gendisk
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> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -849,14 +849,16 @@ static struct mapped_device *alloc_dev(unsigned int minor, int persistent)
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static void free_dev(struct mapped_device *md)
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{
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unsigned int minor = md->disk->first_minor;
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if (md->suspended_bdev) {
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thaw_bdev(md->suspended_bdev, NULL);
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bdput(md->suspended_bdev);
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}
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free_minor(md->disk->first_minor);
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mempool_destroy(md->tio_pool);
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mempool_destroy(md->io_pool);
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del_gendisk(md->disk);
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free_minor(minor);
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put_disk(md->disk);
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blk_put_queue(md->queue);
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kfree(md);
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