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Subject[68/93] [libata] Call flush_dcache_page after PIO data transfers in libata-sff.c
2.6.32-stable review patch.  If anyone has any objections, please let us know.


From: Catalin Marinas <>

commit 2d68b7fe55d9e19a8a868224ed0dfd6526568521 upstream.

flush_dcache_page() must be called after (!ATA_TFLAG_WRITE) the
data copying to avoid D-cache aliasing with user space or I-D cache
coherency issues (when reading data from an ATA device using PIO,
the kernel dirties the D-cache but there is no flush_dcache_page()
required on Harvard architectures).

Signed-off-by: Catalin Marinas <>
Signed-off-by: Jeff Garzik <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/ata/libata-sff.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -893,6 +893,9 @@ static void ata_pio_sector(struct ata_qu

+ if (!do_write)
+ flush_dcache_page(page);
qc->curbytes += qc->sect_size;
qc->cursg_ofs += qc->sect_size;

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