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md: Remove extra mddev_get() in md_seq_start()
A regression is seen where mddev devices stay permanently after they
are stopped due to an elevated reference count.
This was tracked down to an extra mddev_get() in md_seq_start().
It only happened rarely because most of the time the md_seq_start()
is called with a zero offset. The path with an extra mddev_get() only
happens when it starts with a non-zero offset.
The commit noted below changed an mddev_get() to check its success
but inadvertently left the original call in. Remove the extra call.
Fixes: 12a6caf273
("md: only delete entries from all_mddevs when the disk is freed")
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Guoqing Jiang <Guoqing.jiang@linux.dev>
Signed-off-by: Song Liu <song@kernel.org>
This commit is contained in:
parent
c66a6f41e0
commit
3bfc3bcd78
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@ -8154,7 +8154,6 @@ static void *md_seq_start(struct seq_file *seq, loff_t *pos)
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list_for_each(tmp,&all_mddevs)
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list_for_each(tmp,&all_mddevs)
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if (!l--) {
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if (!l--) {
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mddev = list_entry(tmp, struct mddev, all_mddevs);
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mddev = list_entry(tmp, struct mddev, all_mddevs);
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mddev_get(mddev);
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if (!mddev_get(mddev))
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if (!mddev_get(mddev))
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continue;
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continue;
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spin_unlock(&all_mddevs_lock);
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spin_unlock(&all_mddevs_lock);
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