From e2e115d18b76467274d8f818f8828ba168f9c80b Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 23 Sep 2017 16:16:06 -0400 Subject: don't rely upon subsequent bio_add_pc_page() calls failing ... they might actually succeed in some cases (when we are at the queue-imposed segments limit, the next page is not mergable with the last one we'd got in, but the first page covered by the next iovec *is* mergable). Make sure that once it's failed, we are done with that bio. Signed-off-by: Al Viro --- block/bio.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'block/bio.c') diff --git a/block/bio.c b/block/bio.c index 5dbc5e90d716..fe40948d62af 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1380,10 +1380,7 @@ struct bio *bio_map_user_iov(struct request_queue *q, if (n > bytes) n = bytes; - /* - * sorry... - */ - if (bio_add_pc_page(q, bio, pages[j], n, offs) < n) + if (!bio_add_pc_page(q, bio, pages[j], n, offs)) break; /* @@ -1405,6 +1402,9 @@ struct bio *bio_map_user_iov(struct request_queue *q, while (j < npages) put_page(pages[j++]); kvfree(pages); + /* couldn't stuff something into bio? */ + if (bytes) + break; } bio_set_flag(bio, BIO_USER_MAPPED); -- cgit