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>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index b237ff18b39e..ec55d63cf20e 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -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.
                          */