isci: fix event-get pointer increment

commit 77cd72a53f6426f81b7f56a862402849ee903bda upstream.

Hardware only increments the put pointer on event types >= 4.  Do not
increment the get pointer for event type 3.

Reported-by: Kapil Karkra <kapil.karkra@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/scsi/isci/host.c b/drivers/scsi/isci/host.c
index 26072f1e985250f42c3af9cc6c031565b83b123f..ef46d8323377b44f799b4c56a351e84afaa000b8 100644 (file)
--- a/drivers/scsi/isci/host.c
+++ b/drivers/scsi/isci/host.c
@@ -531,6 +531,9 @@ static void sci_controller_process_completions(struct isci_host *ihost)
                        break;
 
                case SCU_COMPLETION_TYPE_EVENT:
+                       sci_controller_event_completion(ihost, ent);
+                       break;
+
                case SCU_COMPLETION_TYPE_NOTIFY: {
                        event_cycle ^= ((event_get+1) & SCU_MAX_EVENTS) <<
                                       (SMU_COMPLETION_QUEUE_GET_EVENT_CYCLE_BIT_SHIFT - SCU_MAX_EVENTS_SHIFT);