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zram: don't return errors from read_from_bdev_async
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bio_alloc will never return a NULL bio when it is allowed to sleep, and
adding a single page to bio with a single vector also can't fail, so
switch to the asserting __bio_add_page variant and drop the error returns.

Link: https://lkml.kernel.org/r/20230411171459.567614-16-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Christoph Hellwig authored and Andrew Morton committed Apr 18, 2023
1 parent fd45af5 commit 0cd97a0
Showing 1 changed file with 4 additions and 12 deletions.
16 changes: 4 additions & 12 deletions drivers/block/zram/zram_drv.c
Original file line number Diff line number Diff line change
Expand Up @@ -585,32 +585,23 @@ static void zram_page_end_io(struct bio *bio)
bio_put(bio);
}

/*
* Returns 1 if the submission is successful.
*/
static int read_from_bdev_async(struct zram *zram, struct page *page,
static void read_from_bdev_async(struct zram *zram, struct page *page,
unsigned long entry, struct bio *parent)
{
struct bio *bio;

bio = bio_alloc(zram->bdev, 1, parent ? parent->bi_opf : REQ_OP_READ,
GFP_NOIO);
if (!bio)
return -ENOMEM;

bio->bi_iter.bi_sector = entry * (PAGE_SIZE >> 9);
if (!bio_add_page(bio, page, PAGE_SIZE, 0)) {
bio_put(bio);
return -EIO;
}
__bio_add_page(bio, page, PAGE_SIZE, 0);

if (!parent)
bio->bi_end_io = zram_page_end_io;
else
bio_chain(bio, parent);

submit_bio(bio);
return 1;
}

#define PAGE_WB_SIG "page_index="
Expand Down Expand Up @@ -840,7 +831,8 @@ static int read_from_bdev(struct zram *zram, struct page *page,
return -EIO;
return read_from_bdev_sync(zram, page, entry, parent);
}
return read_from_bdev_async(zram, page, entry, parent);
read_from_bdev_async(zram, page, entry, parent);
return 1;
}
#else
static inline void reset_bdev(struct zram *zram) {};
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