diff options
authorKevin Cernekee <>2015-04-22 09:30:53 -0300
committerGreg Kroah-Hartman <>2015-06-06 08:21:09 -0700
commiteb20e69ac83a1e4d764a49bf671e1e2e5dc4c15c (patch)
parentcb0751cdf54abec60b58004484b84993564cb9be (diff)
UBI: block: Add missing cache flushes
commit 98fb1ffd8154890d7051750e61ff5548c3ee2ab2 upstream. Block drivers are responsible for calling flush_dcache_page() on each BIO request. This operation keeps the I$ coherent with the D$ on architectures that don't have hardware coherency support. Without this flush, random crashes are seen when executing user programs from an ext4 filesystem backed by a ubiblock device. This patch is based on the change implemented in commit 2d4dc890b5c8 ("block: add helpers to run flush_dcache_page() against a bio and a request's pages"). Fixes: 9d54c8a33eec ("UBI: R/O block driver on top of UBI volumes") Signed-off-by: Kevin Cernekee <> Signed-off-by: Ezequiel Garcia <> Signed-off-by: Richard Weinberger <> Signed-off-by: Greg Kroah-Hartman <>
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index db2c05b6fe7f..c9eb78f10a0d 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -310,6 +310,8 @@ static void ubiblock_do_work(struct work_struct *work)
blk_rq_map_sg(req->q, req, pdu->;
ret = ubiblock_read(pdu);
+ rq_flush_dcache_pages(req);
blk_mq_end_request(req, ret);