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[libata] pata_legacy: for VLB 32bit PIO don't try tricks with slop 

These devices are generally used with ATA anyway and it seems that some
ATAPI will need us to issue the right number of words.  Therefore as we
can't switch mid burst on VLB devices we should only use 32bit I/O for
suitable block sizes.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Alan Cox 2009-02-11 13:08:42 -08:00 committed by Jeff Garzik
parent c48052cc36
commit c55af1f5ab
1 changed files with 4 additions and 3 deletions
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7
drivers/ata/pata_legacy.c
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@ -283,9 +283,10 @@ static void pdc20230_set_piomode(struct ata_port *ap, struct ata_device *adev)
static unsigned int pdc_data_xfer_vlb(struct ata_device *dev,
unsigned char *buf, unsigned int buflen, int rw)
{
if (ata_id_has_dword_io(dev->id)) {
int slop = buflen & 3;
/* 32bit I/O capable *and* we need to write a whole number of dwords */
if (ata_id_has_dword_io(dev->id) && (slop == 0 || slop == 3)) {
struct ata_port *ap = dev->link->ap;
int slop = buflen & 3;
unsigned long flags;
local_irq_save(flags);
@ -735,7 +736,7 @@ static unsigned int vlb32_data_xfer(struct ata_device *adev, unsigned char *buf,
struct ata_port *ap = adev->link->ap;
int slop = buflen & 3;
if (ata_id_has_dword_io(adev->id)) {
if (ata_id_has_dword_io(adev->id) && (slop == 0 || slop == 3)) {
if (rw == WRITE)
iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
else