From c2572f2b4ffc27ba79211aceee3bef53a59bb5cd Mon Sep 17 00:00:00 2001
From: Nick Piggin <npiggin@suse.de>
Date: Wed, 15 Apr 2009 10:32:07 +0200
Subject: 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>
---
drivers/block/brd.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index ee8ed68f197e..5f7e64ba87e5 100644
--- 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:
--
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