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libata: mask off DET when restoring SControl for detach 

libata restores SControl on detach; however, trying to restore
non-zero DET can cause undeterministic behavior including PMP device
going offline till power cycling.  Mask off DET when restoring
SControl.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2008-11-03 19:27:07 +09:00 committed by Jeff Garzik
parent 6a87e42e95
commit 299246f9a2
1 changed files with 1 additions and 1 deletions
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2
drivers/ata/libata-core.c
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@ -5936,7 +5936,7 @@ static void ata_port_detach(struct ata_port *ap)
* to us. Restore SControl and disable all existing devices.
*/
__ata_port_for_each_link(link, ap) {
sata_scr_write(link, SCR_CONTROL, link->saved_scontrol);
sata_scr_write(link, SCR_CONTROL, link->saved_scontrol & 0xff0);
ata_link_for_each_dev(dev, link)
ata_dev_disable(dev);
}