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block: fix pin count management when merging same-page segments 

commit 5905afc2c7 upstream.

There is no need to unpin the added page when adding it to the bio fails
as that is done by the loop below.  Instead we want to unpin it when adding
a single page to the bio more than once as bio_release_pages will only
unpin it once.

Fixes: d1916c86cc ("block: move same page handling from __bio_add_pc_page to the callers")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20230905124731.328255-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Hellwig 2023-09-05 14:47:31 +02:00 committed by Greg Kroah-Hartman
parent 1869589050
commit ccd700dcce
1 changed files with 3 additions and 4 deletions
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7
block/blk-map.c
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@ -315,12 +315,11 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
n = bytes;
if (!bio_add_hw_page(rq->q, bio, page, n, offs,
max_sectors, &same_page)) {
if (same_page)
bio_release_page(bio, page);
max_sectors, &same_page))
break;
}
if (same_page)
bio_release_page(bio, page);
bytes -= n;
offs = 0;
}