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[SCSI] isci: fix event-get pointer increment 

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>
This commit is contained in:
Dan Williams 2011-07-29 17:17:16 -07:00 committed by James Bottomley
parent 9b4be52899
commit 77cd72a53f
1 changed files with 3 additions and 0 deletions
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3
drivers/scsi/isci/host.c
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@ -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);