sata_mv ncq Ignore response status LSB on NCQ

The lower 8 bits of response status are not valid for NCQ.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index c60255810e68..207c400c64df 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -1590,13 +1590,12 @@ static void mv_intr_edma(struct ata_port *ap)
 
                 qc = ata_qc_from_tag(ap, tag);
 
-                /* lower 8 bits of status are EDMA_ERR_IRQ_CAUSE_OFS
-                 * bits (WARNING: might not necessarily be associated
-                 * with this command), which -should- be clear
-                 * if all is well
+                /* For non-NCQ mode, the lower 8 bits of status
+                 * are from EDMA_ERR_IRQ_CAUSE_OFS,
+                 * which should be zero if all went well.
                  */
                 status = le16_to_cpu(pp->crpb[out_index].flags);
-                if (unlikely(status & 0xff)) {
+                if ((status & 0xff) && !(pp->pp_flags & MV_PP_FLAG_NCQ_EN)) {
                         mv_err_intr(ap, qc);
                         return;
                 }