libata: don't flush dcache on slab pages
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@breakpoint.cc>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Cc: stable@kernel.org
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index b7f7f85..c0a9054 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -919,7 +919,7 @@
do_write);
}
- if (!do_write)
+ if (!do_write && !PageSlab(page))
flush_dcache_page(page);
qc->curbytes += qc->sect_size;