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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>
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@ -893,6 +893,9 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
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do_write);
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}
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if (!do_write)
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flush_dcache_page(page);
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qc->curbytes += qc->sect_size;
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qc->cursg_ofs += qc->sect_size;
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