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From: Greg KH on 1 Jul 2010 18:30
2.6.33-stable review patch. If anyone has any objections, please let me know.

------------------

From: Sebastian Andrzej Siewior <sebastian(a)breakpoint.cc>

commit 3842e835490cdf17013b30a788f6311bdcfd0571 upstream.

page_mapping() check this via VM_BUG_ON(PageSlab(page)) so we bug here
with the according debuging turned on.

Future TODO: replace this with a flush_dcache_page_for_pio() API

Signed-off-by: Sebastian Andrzej Siewior <sebastian(a)breakpoint.cc>
Signed-off-by: Jeff Garzik <jgarzik(a)redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
drivers/ata/libata-sff.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -893,7 +893,7 @@ static void ata_pio_sector(struct ata_qu
do_write);
}

- if (!do_write)
+ if (!do_write && !PageSlab(page))
flush_dcache_page(page);

qc->curbytes += qc->sect_size;


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