[SCSI] libsas: fix NCQ mixing with non-NCQ

Some cards (like mvsas) have issue troubles if non-NCQ commands are
mixed with NCQ ones.  Fix this by using the libata default NCQ check
routine which waits until all NCQ commands are complete before issuing
a non-NCQ one.  The impact to cards (like aic94xx) which don't need
this logic should be minimal

Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 042153c..ddbade7 100644 (file)
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -347,6 +347,7 @@ static int sas_ata_scr_read(struct ata_link *link, unsigned int sc_reg_in,
 static struct ata_port_operations sas_sata_ops = {
        .phy_reset              = sas_ata_phy_reset,
        .post_internal_cmd      = sas_ata_post_internal,
+       .qc_defer               = ata_std_qc_defer,
        .qc_prep                = ata_noop_qc_prep,
        .qc_issue               = sas_ata_qc_issue,
        .qc_fill_rtf            = sas_ata_qc_fill_rtf,