sata_mv ncq EH fixes

A hard reset is necessary after hotplug events.
Only clear the error irq bits that were set on entry.

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

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 7e72463a90eb..5dd969e10302 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -1437,6 +1437,7 @@ static void mv_err_intr(struct ata_port *ap, struct ata_queued_cmd *qc)
                 ata_ehi_hotplugged(ehi);
                 ata_ehi_push_desc(ehi, edma_err_cause & EDMA_ERR_DEV_DCON ?
                         "dev disconnect" : "dev connect");
+                action |= ATA_EH_HARDRESET;
         }
 
         if (IS_GEN_I(hpriv)) {
@@ -1465,7 +1466,7 @@ static void mv_err_intr(struct ata_port *ap, struct ata_queued_cmd *qc)
         }
 
         /* Clear EDMA now that SERR cleanup done */
-        writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
+        writelfl(~edma_err_cause, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
 
         if (!err_mask) {
                 err_mask = AC_ERR_OTHER;