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authorKevin Cernekee <cernekee@chromium.org>2015-04-22 09:30:53 -0300
committerRichard Weinberger <richard@nod.at>2015-05-06 22:52:22 +0200
commit98fb1ffd8154890d7051750e61ff5548c3ee2ab2 (patch)
treef6e9baa451e99ed768ded0847d9005605ea2a4c9 /drivers/mtd/ubi
parent5ebe6afaf0057ac3eaeb98defd5456894b446d22 (diff)
UBI: block: Add missing cache flushes
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 <cernekee@chromium.org> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'drivers/mtd/ubi')
-rw-r--r--drivers/mtd/ubi/block.c2
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->usgl.sg);
ret = ubiblock_read(pdu);
+ rq_flush_dcache_pages(req);
+
blk_mq_end_request(req, ret);
}