zram: use memcpy_from_bvec in zram_bvec_write

Use memcpy_from_bvec instead of open coding the logic.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20220303111905.321089-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 14becdf2815dfa70a3f8cc425cae06ac82f7263c..e9474b02012deb758f55df23859a986072a8dd98 100644 (file)
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1465,7 +1465,6 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec,
 {
        int ret;
        struct page *page = NULL;
-       void *src;
        struct bio_vec vec;
 
        vec = *bvec;
@@ -1483,11 +1482,9 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec,
                if (ret)
                        goto out;
 
-               src = kmap_atomic(bvec->bv_page);
                dst = kmap_atomic(page);
-               memcpy(dst + offset, src + bvec->bv_offset, bvec->bv_len);
+               memcpy_from_bvec(dst + offset, bvec);
                kunmap_atomic(dst);
-               kunmap_atomic(src);
 
                vec.bv_page = page;
                vec.bv_len = PAGE_SIZE;