Tejun Heo wrote:
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@xxxxxxxxxx>
---
drivers/ata/libata-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: work/drivers/ata/libata-core.c
===================================================================
--- work.orig/drivers/ata/libata-core.c
+++ work/drivers/ata/libata-core.c
@@ -5936,7 +5936,7 @@ static void ata_port_detach(struct ata_p
* 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);
applied
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