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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 2d4dc890b5
("block: add helpers to run flush_dcache_page() against a bio and a
request's pages").

Fixes: 9d54c8a33e ("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>
This commit is contained in:
Kevin Cernekee 2015-04-22 09:30:53 -03:00 committed by Richard Weinberger
parent 5ebe6afaf0
commit 98fb1ffd81
1 changed files with 2 additions and 0 deletions
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2
drivers/mtd/ubi/block.c
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@ -310,6 +310,8 @@ static void ubiblock_do_work(struct work_struct *work)
blk_rq_map_sg(req->q, req, pdu->usgl.sg); blk_rq_map_sg(req->q, req, pdu->usgl.sg);
ret = ubiblock_read(pdu); ret = ubiblock_read(pdu);
rq_flush_dcache_pages(req);
blk_mq_end_request(req, ret); blk_mq_end_request(req, ret);
} }