linux-kernel - [PATCH] mtd: fix mtd_blkdevs problem with caches on some architectures (2.6.31)

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Date:	Wed, 18 Nov 2009 17:08:10 +0300
From:	Ilya Loginov <isloginov@...il.com>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] mtd: fix mtd_blkdevs problem with caches on some
 architectures (2.6.31)

	Mtdblock driver doesn't call flush_dcache_page for pages in request.
	This may cause problem on architectures where icache doesn't fill from
dcache or with dcache aliases.
	This patch resolves this issue.

Signed-off-by: Ilya Loginov <isloginov@...il.com>
---
mtd_blkdevs.c |    7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 7baba40..59d5d25 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -46,6 +46,8 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
 {
 	unsigned long block, nsect;
 	char *buf;
+	struct req_iterator iter;
+	struct bio_vec *bvec;
 
 	block = blk_rq_pos(req) << 9 >> tr->blkshift;
 	nsect = blk_rq_cur_bytes(req) >> tr->blkshift;
@@ -68,12 +70,17 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
 		for (; nsect > 0; nsect--, block++, buf += tr->blksize)
 			if (tr->readsect(dev, block, buf))
 				return -EIO;
+		rq_for_each_segment(bvec, req, iter)
+			flush_dcache_page(bvec->bv_page);
 		return 0;
 
 	case WRITE:
 		if (!tr->writesect)
 			return -EIO;
 
+		rq_for_each_segment(bvec, req, iter)
+			flush_dcache_page(bvec->bv_page);
+		
 		for (; nsect > 0; nsect--, block++, buf += tr->blksize)
 			if (tr->writesect(dev, block, buf))
 				return -EIO;
--
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