Most of times all pages are just added to bio, and nothing is left, so
not necessary to call into iov_iter_revert().
Same with block size alignment handling.
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
block/bio.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/block/bio.c b/block/bio.c
index 816d412c06e9..09a5e71a0372 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1262,8 +1262,11 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
if (bio->bi_bdev) {
size_t trim = size & (bdev_logical_block_size(bio->bi_bdev) - 1);
- iov_iter_revert(iter, trim);
- size -= trim;
+
+ if (trim) {
+ iov_iter_revert(iter, trim);
+ size -= trim;
+ }
}
if (unlikely(!size)) {
@@ -1286,7 +1289,8 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
offset = 0;
}
- iov_iter_revert(iter, left);
+ if (left)
+ iov_iter_revert(iter, left);
out:
while (i < nr_pages)
bio_release_page(bio, pages[i++]);
--
2.41.0
