diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2017-09-23 16:16:06 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-10-11 17:23:38 -0400 |
| commit | e2e115d18b76467274d8f818f8828ba168f9c80b (patch) | |
| tree | 755fcb8bc56789ea6db0dc1316bdec8298cf1505 /block | |
| parent | 629e42bcc3d0bc04b4e0e40ef3f831507a4693bd (diff) | |
| download | linux-stable-e2e115d18b76467274d8f818f8828ba168f9c80b.tar.gz linux-stable-e2e115d18b76467274d8f818f8828ba168f9c80b.tar.bz2 linux-stable-e2e115d18b76467274d8f818f8828ba168f9c80b.zip | |
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 <viro@zeniv.linux.org.uk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/bio.c | 8 |
1 files changed, 4 insertions, 4 deletions
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); |