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| author | Catalin Marinas <catalin.marinas@arm.com> | 2010-02-04 01:04:50 -0500 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2010-02-04 01:04:50 -0500 |
| commit | 2d68b7fe55d9e19a8a868224ed0dfd6526568521 (patch) | |
| tree | f18068b57359ddc0be3d5fba6f8eabc097efd1af /drivers/ata | |
| parent | cedc9bf906dae044443d403371c887affdb44168 (diff) | |
| download | op-kernel-dev-2d68b7fe55d9e19a8a868224ed0dfd6526568521.zip op-kernel-dev-2d68b7fe55d9e19a8a868224ed0dfd6526568521.tar.gz | |
[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>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/libata-sff.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c index 741065c..730ef3c 100644 --- a/drivers/ata/libata-sff.c +++ b/drivers/ata/libata-sff.c @@ -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; |
