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authorIlya Loginov <isloginov@gmail.com>2009-11-26 03:16:19 -0500
committerJens Axboe <jens.axboe@oracle.com>2009-11-26 03:16:19 -0500
commit2d4dc890b5c8fabd818a8586607e6843c4375e62 (patch)
tree9976ed7b0eed0056f8289aeb6a2b0abf8c940454 /drivers/mtd/mtd_blkdevs.c
parent3586e917f2c7df769d173c4ec99554cb40a911e5 (diff)
block: add helpers to run flush_dcache_page() against a bio and a request's pages
Mtdblock driver doesn't call flush_dcache_page for pages in request. So, this causes problems on architectures where the icache doesn't fill from the dcache or with dcache aliases. The patch fixes this. The ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE symbol was introduced to avoid pointless empty cache-thrashing loops on architectures for which flush_dcache_page() is a no-op. Every architecture was provided with this flush pages on architectires where ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE is equal 1 or do nothing otherwise. See "fix mtd_blkdevs problem with caches on some architectures" discussion on LKML for more information. Signed-off-by: Ilya Loginov <isloginov@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Peter Horton <phorton@bitbox.co.uk> Cc: "Ed L. Cashin" <ecashin@coraid.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/mtd/mtd_blkdevs.c')
-rw-r--r--drivers/mtd/mtd_blkdevs.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 8ca17a3e96ea..64e2b379a350 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -59,12 +59,14 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
59 for (; nsect > 0; nsect--, block++, buf += tr->blksize) 59 for (; nsect > 0; nsect--, block++, buf += tr->blksize)
60 if (tr->readsect(dev, block, buf)) 60 if (tr->readsect(dev, block, buf))
61 return -EIO; 61 return -EIO;
62 rq_flush_dcache_pages(req);
62 return 0; 63 return 0;
63 64
64 case WRITE: 65 case WRITE:
65 if (!tr->writesect) 66 if (!tr->writesect)
66 return -EIO; 67 return -EIO;
67 68
69 rq_flush_dcache_pages(req);
68 for (; nsect > 0; nsect--, block++, buf += tr->blksize) 70 for (; nsect > 0; nsect--, block++, buf += tr->blksize)
69 if (tr->writesect(dev, block, buf)) 71 if (tr->writesect(dev, block, buf))
70 return -EIO; 72 return -EIO;