From: Kent Overstreet <kent.overstreet@gmail.com>
Date: Wed, 9 May 2018 01:33:55 +0000 (-0400)
Subject: block: Add missing flush_dcache_page() call
X-Git-Tag: for-4.18/block-20180603~102
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=6e6e811d747bfe40228dc72309450803ef74d380;p=linux-block.git

block: Add missing flush_dcache_page() call

Since a bio can point to userspace pages (e.g. direct IO), this is
generally necessary.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/block/bio.c b/block/bio.c
index 858f56f3edcb..2112ad01b52c 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -994,6 +994,8 @@ void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter,
 		kunmap_atomic(dst_p);
 		kunmap_atomic(src_p);
 
+		flush_dcache_page(dst_bv.bv_page);
+
 		bio_advance_iter(src, src_iter, bytes);
 		bio_advance_iter(dst, dst_iter, bytes);
 	}