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md: Remove extra mddev_get() in md_seq_start()

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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:
Logan Gunthorpe 2022-09-08 10:15:15 -06:00 committed by Song Liu
parent c66a6f41e0
commit 3bfc3bcd78
1 changed files with 0 additions and 1 deletions
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1
drivers/md/md.c
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@ -8154,7 +8154,6 @@ static void *md_seq_start(struct seq_file *seq, loff_t *pos)
list_for_each(tmp,&all_mddevs)
if (!l--) {
mddev = list_entry(tmp, struct mddev, all_mddevs);
mddev_get(mddev);
if (!mddev_get(mddev))
continue;
spin_unlock(&all_mddevs_lock);