libata: fix EH device failure handling

commit d89293abd95bfd7dd9229087d6c30c1464c5ac83 upstream.

The dev->pio_mode > XFER_PIO_0 test is there to avoid unnecessary
speed down warning messages but it accidentally disabled SATA link spd
down during configuration phase after reset where PIO mode is always
zero.

This patch fixes the problem by moving the test where it belongs.
This makes libata probing sequence behave better when the connection
is flaky at higher link speeds which isn't too uncommon for eSATA
devices.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Cc: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 32da9a93ce44ae221caa63b753c225c81b257f5d..4de18d0c60bce80779a03df8f1a369e2588b9d6f 100644 (file)
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2959,12 +2959,13 @@ 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 && dev->pio_mode > XFER_PIO_0) {
+               if (ehc->tries[dev->devno] == 1) {
                        /* This is the last chance, better to slow
                         * down than lose it.
                         */
                        sata_down_spd_limit(ata_dev_phys_link(dev));
-                       ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
+                       if (dev->pio_mode > XFER_PIO_0)
+                               ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
                }
        }