brd: fix cacheflushing

brd is missing a flush_dcache_page. On 2nd thoughts, perhaps it is the
pagecache's responsibility to flush user virtual aliases (the driver of
course should flush kernel virtual mappings)... but anyway, there
already exists cache flushing for one direction of transfer, so we
should add the other.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index ee8ed68f197ed9d83b3b22535308d993c31ffba8..5f7e64ba87e500030fdb53cadf4c1c51b9941e10 100644 (file)
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -275,8 +275,10 @@ static int brd_do_bvec(struct brd_device *brd, struct page *page,
        if (rw == READ) {
                copy_from_brd(mem + off, brd, sector, len);
                flush_dcache_page(page);
-       } else
+       } else {
+               flush_dcache_page(page);
                copy_to_brd(brd, mem + off, sector, len);
+       }
        kunmap_atomic(mem, KM_USER0);
 
 out: