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libata: no need to speed down if already at PIO0 

After reset, transfer mode is always PIO0 regardless of
dev->xfer_mask.  Check dev->pio_mode before trying to slow down after
configuration failure.  This prevents bogus speed down before device
is actually configured.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-10-29 16:45:05 +09:00 committed by Jeff Garzik
parent cdeab11407
commit 4fb4615bc9
1 changed files with 1 additions and 1 deletions
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2
drivers/ata/libata-eh.c
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@ -2437,7 +2437,7 @@ static int ata_eh_handle_dev_fail(struct ata_device *dev, int err)
/* give it just one more chance */
ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1);
case -EIO:
if (ehc->tries[dev->devno] == 1) {
if (ehc->tries[dev->devno] == 1 && dev->pio_mode > XFER_PIO_0) {
/* This is the last chance, better to slow
* down than lose it.
*/