releases/2.6.35.9/libsas-fix-ncq-mixing-with-non-ncq.patch

   1 From f0ad30d3d2dc924decc0e10b1ff6dc32525a5d99 Mon Sep 17 00:00:00 2001
   2 From: David Milburn <dmilburn@redhat.com>
   3 Date: Fri, 3 Sep 2010 17:13:03 -0500
   4 Subject: [SCSI] libsas: fix NCQ mixing with non-NCQ
   5
   6 From: David Milburn <dmilburn@redhat.com>
   7
   8 commit f0ad30d3d2dc924decc0e10b1ff6dc32525a5d99 upstream.
   9
  10 Some cards (like mvsas) have issue troubles if non-NCQ commands are
  11 mixed with NCQ ones.  Fix this by using the libata default NCQ check
  12 routine which waits until all NCQ commands are complete before issuing
  13 a non-NCQ one.  The impact to cards (like aic94xx) which don't need
  14 this logic should be minimal
  15
  16 Signed-off-by: James Bottomley <James.Bottomley@suse.de>
  17 Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  18
  19 ---
  20  drivers/scsi/libsas/sas_ata.c |    1 +
  21  1 file changed, 1 insertion(+)
  22
  23 --- a/drivers/scsi/libsas/sas_ata.c
  24 +++ b/drivers/scsi/libsas/sas_ata.c
  25 @@ -347,6 +347,7 @@ static int sas_ata_scr_read(struct ata_l
  26  static struct ata_port_operations sas_sata_ops = {
  27         .phy_reset              = sas_ata_phy_reset,
  28         .post_internal_cmd      = sas_ata_post_internal,
  29 +       .qc_defer               = ata_std_qc_defer,
  30         .qc_prep                = ata_noop_qc_prep,
  31         .qc_issue               = sas_ata_qc_issue,
  32         .qc_fill_rtf            = sas_ata_qc_fill_rtf,