[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: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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