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[libata] Call flush_dcache_page after PIO data transfers in libata-sff.c 

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 <catalin.marinas@arm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Catalin Marinas 2010-02-04 01:04:50 -05:00 committed by Jeff Garzik
parent cedc9bf906
commit 2d68b7fe55
1 changed files with 3 additions and 0 deletions
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3
drivers/ata/libata-sff.c
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@ -893,6 +893,9 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
do_write);
}
if (!do_write)
flush_dcache_page(page);
qc->curbytes += qc->sect_size;
qc->cursg_ofs += qc->sect_size;