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libata: fix EH device failure handling

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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>
This commit is contained in:
Tejun Heo 2009-01-29 20:31:29 +09:00 committed by Jeff Garzik
parent 8d993eaa9c
commit d89293abd9
1 changed files with 3 additions and 2 deletions
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drivers/ata/libata-eh.c
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@ -2979,12 +2979,13 @@ 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);
}
}