src/patches/suse-2.6.27.39/patches.drivers/libata-dont-restore-DET-on-detach

   1 From: Tejun Heo <tj@kernel.org>
   2 Subject: libata: mask off DET when restoring SControl for detach
   3 References: bnc#440980
   4
   5 libata restores SControl on detach; however, trying to restore
   6 non-zero DET can cause undeterministic behavior including PMP device
   7 going offline till power cycling.  Mask off DET when restoring
   8 SControl.
   9
  10 Signed-off-by: Tejun Heo <tj@kernel.org>
  11 Signed-off-by: Tejun Heo <teheo@suse.de>
  12 ---
  13  drivers/ata/libata-core.c |    2 +-
  14  1 file changed, 1 insertion(+), 1 deletion(-)
  15
  16 --- a/drivers/ata/libata-core.c
  17 +++ b/drivers/ata/libata-core.c
  18 @@ -5874,7 +5874,7 @@ static void ata_port_detach(struct ata_p
  19          * to us.  Restore SControl and disable all existing devices.
  20          */
  21         __ata_port_for_each_link(link, ap) {
  22 -               sata_scr_write(link, SCR_CONTROL, link->saved_scontrol);
  23 +               sata_scr_write(link, SCR_CONTROL, link->saved_scontrol & 0xff0);
  24                 ata_link_for_each_dev(dev, link)
  25                         ata_dev_disable(dev);
  26         }