Commit 2d68b7fe authored Feb 04, 2010 by Catalin Marinas Committed by Jeff Garzik Feb 04, 2010

[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>

parent cedc9bf9

drivers/ata/libata-sff.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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;