3.16.7-ckt18 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Kevin Cernekee <cernekee@xxxxxxxxxxxx>
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 <cernekee@xxxxxxxxxxxx>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxx>
Signed-off-by: Richard Weinberger <richard@xxxxxx>
[ luis: backported to 3.16: used Kevin's backport to 3.14 ]
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
drivers/mtd/ubi/block.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index 8457df7ec5af..8b4a182d7cf9 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -255,6 +255,7 @@ static int do_ubiblock_request(struct ubiblock *dev, struct request *req)
mutex_lock(&dev->dev_mutex);
ret = ubiblock_read(dev, bio_data(req->bio), sec, len);
mutex_unlock(&dev->dev_mutex);
+ rq_flush_dcache_pages(req);
return ret;
}
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